Publications by Department of Physics of Nanostructures
Departments of ISQI | Publications of ISQI
2025 |
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| 138. | Bogusław Mróz, Zbigniew Trybula, Sławomir Mielcarek, Aleksandra Trzaskowska The influence of NH4 doping on the elastic properties of RbH2AsO4 crystals Scientific Reports, 15 (1), pp. 39140, 2025, ISSN: 2045-2322. @article{Mroz2025, title = {The influence of NH4 doping on the elastic properties of RbH2AsO4 crystals}, author = {Bogusław Mróz and Zbigniew Trybula and Sławomir Mielcarek and Aleksandra Trzaskowska}, url = {https://doi.org/10.1038/s41598-025-27078-7}, doi = {10.1038/s41598-025-27078-7}, issn = {2045-2322}, year = {2025}, date = {2025-11-07}, journal = {Scientific Reports}, volume = {15}, number = {1}, pages = {39140}, abstract = {We report a systematic study of the elastic and dynamic properties of mixed Rb1-x(NH4)xH2AsO4 (RADA) crystals using high-resolution Brillouin light scattering over a broad temperature range (40--300 K). By varying the ammonium concentration, we reveal how $$backslash:backslashtextNbackslashtextH_4^+$$substitution alters the elastic stiffness tensor, phase transition temperatures, phonon damping, and order parameter relaxation dynamics. The results show a clear evolution from ferroelectric to antiferroelectric and proton-glass behavior as the ammonium content increases. We observe enhanced elastic softening, increased phonon scattering, and reduced relaxation times with doping, indicating a growing degree of structural disorder and frustration in the hydrogen-bond network. The observed changes in phonon thermal conductivity correlate with these elastic anomalies. Our findings highlight the potential of chemical substitution in tuning the mechanical and thermal properties of hydrogen-bonded ferroelectric crystals, with implications for designing adaptive low-temperature optical and memory materials.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We report a systematic study of the elastic and dynamic properties of mixed Rb1-x(NH4)xH2AsO4 (RADA) crystals using high-resolution Brillouin light scattering over a broad temperature range (40--300 K). By varying the ammonium concentration, we reveal how $$backslash:backslashtextNbackslashtextH_4^+$$substitution alters the elastic stiffness tensor, phase transition temperatures, phonon damping, and order parameter relaxation dynamics. The results show a clear evolution from ferroelectric to antiferroelectric and proton-glass behavior as the ammonium content increases. We observe enhanced elastic softening, increased phonon scattering, and reduced relaxation times with doping, indicating a growing degree of structural disorder and frustration in the hydrogen-bond network. The observed changes in phonon thermal conductivity correlate with these elastic anomalies. Our findings highlight the potential of chemical substitution in tuning the mechanical and thermal properties of hydrogen-bonded ferroelectric crystals, with implications for designing adaptive low-temperature optical and memory materials. |
| 137. | Liubov Ivzhenko, Sergey Polevoy, Sergey Nedukh, Maciej Krawczyk Influence of photon-magnon coupling on spin-wave-excitation enhancement Phys. Rev. Appl., 24 , pp. 054056, 2025. @article{49pf-hw6m, title = {Influence of photon-magnon coupling on spin-wave-excitation enhancement}, author = {Liubov Ivzhenko and Sergey Polevoy and Sergey Nedukh and Maciej Krawczyk}, url = {https://link.aps.org/doi/10.1103/49pf-hw6m}, doi = {10.1103/49pf-hw6m}, year = {2025}, date = {2025-11-01}, journal = {Phys. Rev. Appl.}, volume = {24}, pages = {054056}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
| 136. | Bivas Rana, Susmita Saha, Paweł Gruszecki, Jorge Puebla Focus on coupling phenomena in magnonics and magnonic metamaterials Journal of Physics: Condensed Matter, 37 (43), pp. 430201, 2025. @article{Rana_2025, title = {Focus on coupling phenomena in magnonics and magnonic metamaterials}, author = {Bivas Rana and Susmita Saha and Paweł Gruszecki and Jorge Puebla}, url = {https://doi.org/10.1088/1361-648X/ae1398}, doi = {10.1088/1361-648X/ae1398}, year = {2025}, date = {2025-10-01}, journal = {Journal of Physics: Condensed Matter}, volume = {37}, number = {43}, pages = {430201}, publisher = {IOP Publishing}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
| 135. | Rob den Teuling, Ritesh Das, Artem V Bondarenko, Elena V. Tartakovskaya, Gerrit E W Bauer, Yaroslav M Blanter Spin waves in the bilayer van der Waals magnet CrSBr Phys. Rev. B, 112 , pp. 144442, 2025. @article{w4xn-2yff, title = {Spin waves in the bilayer van der Waals magnet CrSBr}, author = {Rob den Teuling and Ritesh Das and Artem V Bondarenko and Elena V. Tartakovskaya and Gerrit E W Bauer and Yaroslav M Blanter}, url = {https://link.aps.org/doi/10.1103/w4xn-2yff}, doi = {10.1103/w4xn-2yff}, year = {2025}, date = {2025-10-01}, journal = {Phys. Rev. B}, volume = {112}, pages = {144442}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
| 134. | Mateusz Zelent, Maciej Krawczyk, Konstantin Y Guslienko Beyond Fixed-Size Skyrmions in Nanodots: Switchable Multistability with Ferromagnetic Rings Nano Letters, 2025, ISSN: 1530-6984. @article{Zelent2025, title = {Beyond Fixed-Size Skyrmions in Nanodots: Switchable Multistability with Ferromagnetic Rings}, author = {Mateusz Zelent and Maciej Krawczyk and Konstantin Y Guslienko}, url = {https://doi.org/10.1021/acs.nanolett.5c02678}, doi = {10.1021/acs.nanolett.5c02678}, issn = {1530-6984}, year = {2025}, date = {2025-09-11}, journal = {Nano Letters}, publisher = {American Chemical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
| 133. | Amrutha V. Achuthan, Sreedevi Janardhanan, Piotr Kuświk, Aleksandra Trzaskowska Scientific Reports, 15 (1), pp. 25585, 2025, ISSN: 2045-2322. @article{Achuthan2025, title = {Influence of effective thickness in elastic anisotropy and surface acoustic wave propagation in CoFeB/Au multilayer}, author = {Amrutha V. Achuthan and Sreedevi Janardhanan and Piotr Ku{ś}wik and Aleksandra Trzaskowska}, url = {https://doi.org/10.1038/s41598-025-08560-8}, doi = {10.1038/s41598-025-08560-8}, issn = {2045-2322}, year = {2025}, date = {2025-07-15}, journal = {Scientific Reports}, volume = {15}, number = {1}, pages = {25585}, abstract = {Surface acoustic waves (SAWs) in multilayered nanostructures represent a critical frontier in understanding material behavior at the nanoscale, with profound implications for emerging acoustic and spintronic technologies. In this study, we investigate the influence of the magnetic layer thickness on the propagation of surface acoustic waves in CoFeB-based multilayers. Two approaches to effective medium modelling are considered: treating the entire multilayer as a homogeneous medium and focusing on the region affected by light penetration. The elastic properties of the system are analyzed using Brillouin light scattering and numerical modelling, with a particular emphasis on the anisotropy of Young's modulus and its dependence on CoFeB thickness. The results reveal a significant variation in surface acoustic wave velocity and elastic anisotropy as a function of the multilayer configuration, highlighting the role of the penetration depth in effective medium approximations. The best agreement with BLS measurements was obtained for the effective medium model limited to the optical penetration depth, highlighting the importance of light-matter interaction volume in SAW-based diagnostics. These findings provide valuable insights into the tunability of acoustic and spin-wave frequencies through structural modifications, which is crucial for developing high-performance resonators, surface acoustic wave filters, and spin-wave-based information processing devices.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Surface acoustic waves (SAWs) in multilayered nanostructures represent a critical frontier in understanding material behavior at the nanoscale, with profound implications for emerging acoustic and spintronic technologies. In this study, we investigate the influence of the magnetic layer thickness on the propagation of surface acoustic waves in CoFeB-based multilayers. Two approaches to effective medium modelling are considered: treating the entire multilayer as a homogeneous medium and focusing on the region affected by light penetration. The elastic properties of the system are analyzed using Brillouin light scattering and numerical modelling, with a particular emphasis on the anisotropy of Young's modulus and its dependence on CoFeB thickness. The results reveal a significant variation in surface acoustic wave velocity and elastic anisotropy as a function of the multilayer configuration, highlighting the role of the penetration depth in effective medium approximations. The best agreement with BLS measurements was obtained for the effective medium model limited to the optical penetration depth, highlighting the importance of light-matter interaction volume in SAW-based diagnostics. These findings provide valuable insights into the tunability of acoustic and spin-wave frequencies through structural modifications, which is crucial for developing high-performance resonators, surface acoustic wave filters, and spin-wave-based information processing devices. |
| 132. | Ephraim T Mathew, Andriy E. Serebryannikov, Jacek Jenczyk, Igor Iatsunskyi, Szymon Murawka, Mikołaj Lewandowski, Maciej Wiesner ACS Applied Materials & Interfaces, 2025, ISSN: 1944-8244. @article{Mathew2025, title = {Raman Scattering Enhancements Due to Super- and Subradiant Collective Plasmon Modes on Large-Area 2D-Au Arrays}, author = {Ephraim T Mathew and Andriy E. Serebryannikov and Jacek Jenczyk and Igor Iatsunskyi and Szymon Murawka and Mikołaj Lewandowski and Maciej Wiesner }, url = {https://doi.org/10.1021/acsami.5c04804}, doi = {10.1021/acsami.5c04804}, issn = {1944-8244}, year = {2025}, date = {2025-05-22}, journal = {ACS Applied Materials & Interfaces}, publisher = {American Chemical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
| 131. | Sara Memarzadeh, Mateusz Gołębiewski, Maciej Krawczyk, Jarosław W. Kłos Nucleation and arrangement of Abrikosov vortices in hybrid superconductor–ferromagnet nanostructures Nanoscale Horiz., 10 , pp. 1453 - 1464, 2025. @article{D4NH00618F, title = {Nucleation and arrangement of Abrikosov vortices in hybrid superconductor–ferromagnet nanostructures}, author = {Sara Memarzadeh and Mateusz Gołębiewski and Maciej Krawczyk and Jarosław W. Kłos}, url = {http://dx.doi.org/10.1039/D4NH00618F}, doi = {10.1039/D4NH00618F}, year = {2025}, date = {2025-05-21}, journal = {Nanoscale Horiz.}, volume = {10}, pages = {1453 - 1464}, publisher = {The Royal Society of Chemistry}, abstract = {This study investigates the nucleation, dynamics, and stationary configurations of Abrikosov vortices in hybrid superconductor–ferromagnet nanostructures subjected to inhomogeneous magnetic fields generated by a ferromagnetic nanodot. Employing the simulations based on time-dependent Ginzburg–Landau coupled with Maxwell's equations, we reveal the evolution of curved vortex structures that exhibit creep-like deformation before stabilizing. The interplay between vortices and currents confined within the superconducting nanoelement gives rise to unconventional stationary vortex arrangements, which evolve gradually with increasing magnetic field strength—a behavior absent in homogeneous fields. Our numerical results illustrate how the ferromagnetic element can control vortex configurations via a stray magnetic field—insights that are difficult to access experimentally or analytically. We demonstrate that the superconducting nanoelement can stabilize into distinct vortex states in response to even small system perturbations. This highlights the extreme sensitivity of the system and the richness of its dynamic behaviour, revealing complex pinning mechanisms and providing valuable insights into the optimisation of nanoscale superconducting systems.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This study investigates the nucleation, dynamics, and stationary configurations of Abrikosov vortices in hybrid superconductor–ferromagnet nanostructures subjected to inhomogeneous magnetic fields generated by a ferromagnetic nanodot. Employing the simulations based on time-dependent Ginzburg–Landau coupled with Maxwell's equations, we reveal the evolution of curved vortex structures that exhibit creep-like deformation before stabilizing. The interplay between vortices and currents confined within the superconducting nanoelement gives rise to unconventional stationary vortex arrangements, which evolve gradually with increasing magnetic field strength—a behavior absent in homogeneous fields. Our numerical results illustrate how the ferromagnetic element can control vortex configurations via a stray magnetic field—insights that are difficult to access experimentally or analytically. We demonstrate that the superconducting nanoelement can stabilize into distinct vortex states in response to even small system perturbations. This highlights the extreme sensitivity of the system and the richness of its dynamic behaviour, revealing complex pinning mechanisms and providing valuable insights into the optimisation of nanoscale superconducting systems. |
| 130. | Andriy E. Serebryannikov, Atilla O Cakmak, Evrim Colak Scientific Reports, 15 (1), pp. 7873, 2025, ISSN: 2045-2322. @article{Serebryannikov2025, title = {Effects of gradual deformation of identical and nonidentical, rotated and nonrotated U-shaped subwavelength resonators in few-layer metasurfaces}, author = {Andriy E. Serebryannikov and Atilla O Cakmak and Evrim Colak}, url = {https://doi.org/10.1038/s41598-025-88678-x}, doi = {10.1038/s41598-025-88678-x}, issn = {2045-2322}, year = {2025}, date = {2025-03-06}, journal = {Scientific Reports}, volume = {15}, number = {1}, pages = {7873}, abstract = {Raising of negative-index medium has been going hand-by-hand with the exploration of quasiplanar subwavelength resonators. Now they are widely used in modern microwave, terahertz, and infrared devices, as well as in advanced physics research. Effects of stacking of the arrays of subwavelength resonators in one few-layer metasurface is connected with the key problems of modern electrical engineering, applied physics, and beyond. Recently, the interest to subwavelength resonators has been growing due to the progress in topological photonics and non-Hermitian photonics. In this paper, the selected effects of arrays coupling in a few-layer metasurface are revisited with yet uncommon focus, i.e., survival and (dis)appearance of subwavelength resonances at the gradual deformation of the resonators at a given lattice period. Microwave frequency range has been chosen to illustrate the concept. The case when the metasurfaces comprise two periodically placed U-shaped resonator arrays is considered. The sizes of the resonators are either varied simultaneously for both front-side and back-side arrays or for the back-side array only. The main purpose of this study is to explore the basic scenarios of resonance evolution in the space of geometrical parameters. It is shown that different resonances may be sensitive to the variations in geometrical parameters and to the dissimilarity between the front-side and back-side arrays to a different extent. The obtained results point to the existence of the bands, resonances, polarization-conversion and related asymmetric transmission regimes that are robust to the deformations. They can serve as the starting point in understanding the functional capability of the physical features while adjusting the size for a much wider variety of the types of subwavelength resonators. Their unveiling promises a wide avenue towards the realization of new frequency-domain and angle-domain filters, ultrathin polarization-plane convertors, asymmetric transmission devices and advanced microwave antennas.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Raising of negative-index medium has been going hand-by-hand with the exploration of quasiplanar subwavelength resonators. Now they are widely used in modern microwave, terahertz, and infrared devices, as well as in advanced physics research. Effects of stacking of the arrays of subwavelength resonators in one few-layer metasurface is connected with the key problems of modern electrical engineering, applied physics, and beyond. Recently, the interest to subwavelength resonators has been growing due to the progress in topological photonics and non-Hermitian photonics. In this paper, the selected effects of arrays coupling in a few-layer metasurface are revisited with yet uncommon focus, i.e., survival and (dis)appearance of subwavelength resonances at the gradual deformation of the resonators at a given lattice period. Microwave frequency range has been chosen to illustrate the concept. The case when the metasurfaces comprise two periodically placed U-shaped resonator arrays is considered. The sizes of the resonators are either varied simultaneously for both front-side and back-side arrays or for the back-side array only. The main purpose of this study is to explore the basic scenarios of resonance evolution in the space of geometrical parameters. It is shown that different resonances may be sensitive to the variations in geometrical parameters and to the dissimilarity between the front-side and back-side arrays to a different extent. The obtained results point to the existence of the bands, resonances, polarization-conversion and related asymmetric transmission regimes that are robust to the deformations. They can serve as the starting point in understanding the functional capability of the physical features while adjusting the size for a much wider variety of the types of subwavelength resonators. Their unveiling promises a wide avenue towards the realization of new frequency-domain and angle-domain filters, ultrathin polarization-plane convertors, asymmetric transmission devices and advanced microwave antennas. |
| 129. | Syamlal Sankaran Kunnath, Mateusz Zelent, Mathieu Moalic, Maciej Krawczyk Small Structures, n/a (n/a), pp. 2400627, 2025. @article{https://doi.org/10.1002/sstr.202400627, title = {Enhancement of Dynamical Coupling in Artificial Spin-Ice Systems by Incorporating Perpendicularly Magnetized Ferromagnetic Matrix}, author = {Syamlal Sankaran Kunnath and Mateusz Zelent and Mathieu Moalic and Maciej Krawczyk}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/sstr.202400627}, doi = {https://doi.org/10.1002/sstr.202400627}, year = {2025}, date = {2025-02-19}, journal = {Small Structures}, volume = {n/a}, number = {n/a}, pages = {2400627}, abstract = {Artificial spin-ice (ASI) systems, consisting of arrays of interacting ferromagnetic nanoelements, offer a versatile platform for reconfigurable magnonics with potential in GHz logic and neuromorphic computing. However, weak dipolar coupling between nanoelements severely limits their functionality. A rich spin-wave spectrum is numerically demonstrated in an ASI structure immersed in a perpendicularly magnetized ferromagnetic matrix, which is different from a conventional ASI system. A strong magnon–magnon coupling is observed between the bulk second-order mode of the ASI and the fundamental mode of the matrix, supported by a pronounced anticrossing frequency gap. It is shown that, in addition to the internanoelement dipolar coupling, exchange interactions at the nanoelement-matrix interface play a crucial role in this hybridization. Furthermore, the strength of the coupling can be enhanced by almost 40% just by reconfiguring the magnetization at the vertices from low-energy to high-energy monopole states. These results open the way to exploit ASI systems for magnonic applications, taking advantage of the strong coupling and vertex-dependent dynamics.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Artificial spin-ice (ASI) systems, consisting of arrays of interacting ferromagnetic nanoelements, offer a versatile platform for reconfigurable magnonics with potential in GHz logic and neuromorphic computing. However, weak dipolar coupling between nanoelements severely limits their functionality. A rich spin-wave spectrum is numerically demonstrated in an ASI structure immersed in a perpendicularly magnetized ferromagnetic matrix, which is different from a conventional ASI system. A strong magnon–magnon coupling is observed between the bulk second-order mode of the ASI and the fundamental mode of the matrix, supported by a pronounced anticrossing frequency gap. It is shown that, in addition to the internanoelement dipolar coupling, exchange interactions at the nanoelement-matrix interface play a crucial role in this hybridization. Furthermore, the strength of the coupling can be enhanced by almost 40% just by reconfiguring the magnetization at the vertices from low-energy to high-energy monopole states. These results open the way to exploit ASI systems for magnonic applications, taking advantage of the strong coupling and vertex-dependent dynamics. |
| 128. | Krzysztof Sobucki, Igor Lyubchanskii, Maciej Krawczyk, Paweł Gruszecki Goos-Hänchen shift of inelastically scattered spin-wave beams and cascade nonlinear magnon processes Scientific Reports, 15 (1), pp. 5538, 2025, ISSN: 2045-2322. @article{Sobucki2025, title = {Goos-Hänchen shift of inelastically scattered spin-wave beams and cascade nonlinear magnon processes}, author = {Krzysztof Sobucki and Igor Lyubchanskii and Maciej Krawczyk and Paweł Gruszecki}, url = {https://doi.org/10.1038/s41598-025-86879-y}, doi = {10.1038/s41598-025-86879-y}, issn = {2045-2322}, year = {2025}, date = {2025-02-14}, journal = {Scientific Reports}, volume = {15}, number = {1}, pages = {5538}, abstract = {We study, using micromagnetic simulations, the inelastic scattering of spin-wave beams on edge-localized spin-wave modes in a thin ferromagnetic film. In the splitting and confluence processes, the new spin-wave beams are generated with frequencies shifted by the edge-mode frequency. We report that inelastically scattered spin-wave beams in both processes not only change their direction of propagation but also undergo lateral shifts along the interface, analogous to the Goos--Hänchen effect known in optics. These shifts of inelastically scattered beams, for a few special cases described in the paper, can be in the range of several wavelengths, which is larger than the Goos--Hänchen shift of elastically reflected beam. Unexpectedly, at selected frequencies, we found a significant increase in the value of the lateral shifts of the scattered spin-wave beams formed in the confluence process. We show that this effect is associated with the cascading nonlinear processes taking place at the edge of the film and involving the primary edge spin wave. Our results make an important contribution to the understanding of the nonlinear nature of spin waves and provide a way to exploit it in signal processing with magnons.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We study, using micromagnetic simulations, the inelastic scattering of spin-wave beams on edge-localized spin-wave modes in a thin ferromagnetic film. In the splitting and confluence processes, the new spin-wave beams are generated with frequencies shifted by the edge-mode frequency. We report that inelastically scattered spin-wave beams in both processes not only change their direction of propagation but also undergo lateral shifts along the interface, analogous to the Goos--Hänchen effect known in optics. These shifts of inelastically scattered beams, for a few special cases described in the paper, can be in the range of several wavelengths, which is larger than the Goos--Hänchen shift of elastically reflected beam. Unexpectedly, at selected frequencies, we found a significant increase in the value of the lateral shifts of the scattered spin-wave beams formed in the confluence process. We show that this effect is associated with the cascading nonlinear processes taking place at the edge of the film and involving the primary edge spin wave. Our results make an important contribution to the understanding of the nonlinear nature of spin waves and provide a way to exploit it in signal processing with magnons. |
| 127. | Gianluca Gubbiotti, Anjan Barman, Sam Ladak, Cristina Bran, Dirk Grundler, Michael Huth, Harald Plank, Georg Schmidt, Sebastiaan van Dijken, Robert Streubel, Oleksandr Dobrovoloskiy, Valerio Scagnoli, Laura Heyderman, Claire Donnelly, Olav Hellwig, Lorenzo Fallarino, Benjamin M Jungfleisch, Alan Farhan, Nicolò Maccaferri, Paolo Vavassori, Peter Fischer, Riccardo Tomasello, Giovanni Finocchio, Rodolphe Clérac, Roberta Sessoli, Denys Makarov, Denis D Sheka, Maciej Krawczyk, Rodolfo Gallardo, Pedro Landeros, Massimiliano d’Aquino, Riccardo Hertel, Philipp Pirro, Florin Ciubotaru, Markus Becherer, Jack Gartside, Teruo Ono, Paolo Bortolotti, Amalio Fernández-Pacheco 2025 roadmap on 3D nanomagnetism Journal of Physics: Condensed Matter, 37 (14), pp. 143502, 2025. @article{Gubbiotti_2025, title = {2025 roadmap on 3D nanomagnetism}, author = {Gianluca Gubbiotti and Anjan Barman and Sam Ladak and Cristina Bran and Dirk Grundler and Michael Huth and Harald Plank and Georg Schmidt and Sebastiaan van Dijken and Robert Streubel and Oleksandr Dobrovoloskiy and Valerio Scagnoli and Laura Heyderman and Claire Donnelly and Olav Hellwig and Lorenzo Fallarino and Benjamin M Jungfleisch and Alan Farhan and Nicolò Maccaferri and Paolo Vavassori and Peter Fischer and Riccardo Tomasello and Giovanni Finocchio and Rodolphe Clérac and Roberta Sessoli and Denys Makarov and Denis D Sheka and Maciej Krawczyk and Rodolfo Gallardo and Pedro Landeros and Massimiliano d’Aquino and Riccardo Hertel and Philipp Pirro and Florin Ciubotaru and Markus Becherer and Jack Gartside and Teruo Ono and Paolo Bortolotti and Amalio Fernández-Pacheco}, url = {https://dx.doi.org/10.1088/1361-648X/ad9655}, doi = {10.1088/1361-648X/ad9655}, year = {2025}, date = {2025-02-01}, journal = {Journal of Physics: Condensed Matter}, volume = {37}, number = {14}, pages = {143502}, publisher = {IOP Publishing}, abstract = {The transition from planar to three-dimensional (3D) magnetic nanostructures represents a significant advancement in both fundamental research and practical applications, offering vast potential for next-generation technologies like ultrahigh-density storage, memory, logic, and neuromorphic computing. Despite being a relatively new field, the emergence of 3D nanomagnetism presents numerous opportunities for innovation, prompting the creation of a comprehensive roadmap by leading international researchers. This roadmap aims to facilitate collaboration and interdisciplinary dialogue to address challenges in materials science, physics, engineering, and computing. The roadmap comprises eighteen sections, roughly divided into three blocks. The first block explores the fundamentals of 3D nanomagnetism, focusing on recent trends in fabrication techniques and imaging methods crucial for understanding complex spin textures, curved surfaces, and small-scale interactions. Techniques such as two-photon lithography and focused electron beam-induced deposition enable the creation of intricate 3D architectures, while advanced imaging methods like electron holography and synchrotron x-ray tomography provide nanoscale spatial resolution for studying magnetization dynamics in three dimensions. Various 3D magnetic systems, including coupled multilayer systems, artificial spin-ice, magneto-plasmonic systems, topological spin textures, and molecular magnets are discussed. The second block introduces analytical and numerical methods for investigating 3D nanomagnetic structures and curvilinear systems, highlighting geometrically curved architectures, interconnected nanowire systems, and other complex geometries. Finite element methods are emphasized for capturing complex geometries, along with direct frequency domain solutions for addressing magnonic problems. The final block focuses on 3D magnonic crystals and networks, exploring their fundamental properties and potential applications in magnonic circuits, memory, and spintronics. Computational approaches using 3D nanomagnetic systems and complex topological textures in 3D spintronics are highlighted for their potential to enable faster and more energy-efficient computing.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The transition from planar to three-dimensional (3D) magnetic nanostructures represents a significant advancement in both fundamental research and practical applications, offering vast potential for next-generation technologies like ultrahigh-density storage, memory, logic, and neuromorphic computing. Despite being a relatively new field, the emergence of 3D nanomagnetism presents numerous opportunities for innovation, prompting the creation of a comprehensive roadmap by leading international researchers. This roadmap aims to facilitate collaboration and interdisciplinary dialogue to address challenges in materials science, physics, engineering, and computing. The roadmap comprises eighteen sections, roughly divided into three blocks. The first block explores the fundamentals of 3D nanomagnetism, focusing on recent trends in fabrication techniques and imaging methods crucial for understanding complex spin textures, curved surfaces, and small-scale interactions. Techniques such as two-photon lithography and focused electron beam-induced deposition enable the creation of intricate 3D architectures, while advanced imaging methods like electron holography and synchrotron x-ray tomography provide nanoscale spatial resolution for studying magnetization dynamics in three dimensions. Various 3D magnetic systems, including coupled multilayer systems, artificial spin-ice, magneto-plasmonic systems, topological spin textures, and molecular magnets are discussed. The second block introduces analytical and numerical methods for investigating 3D nanomagnetic structures and curvilinear systems, highlighting geometrically curved architectures, interconnected nanowire systems, and other complex geometries. Finite element methods are emphasized for capturing complex geometries, along with direct frequency domain solutions for addressing magnonic problems. The final block focuses on 3D magnonic crystals and networks, exploring their fundamental properties and potential applications in magnonic circuits, memory, and spintronics. Computational approaches using 3D nanomagnetic systems and complex topological textures in 3D spintronics are highlighted for their potential to enable faster and more energy-efficient computing. |
| 126. | Mateusz Gołębiewski, Krzysztof Szulc, Maciej Krawczyk Magnetic field controlled surface localization of ferromagnetic resonance modes in 3D nanostructures Acta Materialia, 283 , pp. 120499, 2025, ISSN: 1359-6454. @article{GOLEBIEWSKI2025120499, title = {Magnetic field controlled surface localization of ferromagnetic resonance modes in 3D nanostructures}, author = {Mateusz Gołębiewski and Krzysztof Szulc and Maciej Krawczyk}, url = {https://www.sciencedirect.com/science/article/pii/S1359645424008486}, doi = {https://doi.org/10.1016/j.actamat.2024.120499}, issn = {1359-6454}, year = {2025}, date = {2025-01-15}, journal = {Acta Materialia}, volume = {283}, pages = {120499}, abstract = {By extending the current understanding and use of magnonics beyond conventional planar systems, we demonstrate the surface localization of ferromagnetic resonance (FMR) modes through the design of complex three-dimensional nanostructures. Using micromagnetic simulations, we systematically investigate woodpile-like scaffolds and gyroids — periodic chiral entities characterized by their triple junctions. The study highlights the critical role of demagnetizing fields and exchange energy in determining the FMR responses of 3D nanosystems, especially the strongly asymmetric distribution of the spin-wave mode over the system’s height. Importantly, the top–bottom dynamic switching of the surface mode localization across the structures in response to changes in magnetic field orientation provides a new method for controlling magnetization dynamics. The results demonstrate the critical role of the geometric features in dictating the dynamic magnetic behavior of three-dimensional nanostructures, paving the way for both experimental exploration and practical advances in 3D magnonics.}, keywords = {}, pubstate = {published}, tppubtype = {article} } By extending the current understanding and use of magnonics beyond conventional planar systems, we demonstrate the surface localization of ferromagnetic resonance (FMR) modes through the design of complex three-dimensional nanostructures. Using micromagnetic simulations, we systematically investigate woodpile-like scaffolds and gyroids — periodic chiral entities characterized by their triple junctions. The study highlights the critical role of demagnetizing fields and exchange energy in determining the FMR responses of 3D nanosystems, especially the strongly asymmetric distribution of the spin-wave mode over the system’s height. Importantly, the top–bottom dynamic switching of the surface mode localization across the structures in response to changes in magnetic field orientation provides a new method for controlling magnetization dynamics. The results demonstrate the critical role of the geometric features in dictating the dynamic magnetic behavior of three-dimensional nanostructures, paving the way for both experimental exploration and practical advances in 3D magnonics. |
| 125. | Jacek Baranowski, Bogusław Mróz, Sławomir Mielcarek, I Iatsunskyi, Aleksandra Trzaskowska Scientific Reports, 15 (1), pp. 1358, 2025, ISSN: 2045-2322. @article{Baranowski2025, title = {High resolution Brillouin spectroscopy of the surface acoustic waves in Sb2Te3 van der Waals single crystals}, author = {Jacek Baranowski and Bogusław Mróz and Sławomir Mielcarek and I Iatsunskyi and Aleksandra Trzaskowska}, url = {https://doi.org/10.1038/s41598-025-85742-4}, doi = {10.1038/s41598-025-85742-4}, issn = {2045-2322}, year = {2025}, date = {2025-01-08}, journal = {Scientific Reports}, volume = {15}, number = {1}, pages = {1358}, abstract = {High-resolution Brillouin spectroscopy was employed to investigate the anisotropy in surface wave velocities within a bulk single crystal of Sb2Te3, a well-known layered van der Waals material. By leveraging the bulk elastic constants derived from various simulation methods, we were able to theoretically calculate the distribution of surface acoustic phonon velocities on the cleavage plane of the material. Upon analyzing multiple simulation results, it became evident that the most significant discrepancies arose in the calculations of the elastic constant c33, with values ranging from 48 to 98 GPa. Consequently, a direct measurement of the c33 elastic constant for Sb2Te3 was attempted. Through our ellipsometry results, we determined both the real and imaginary components of the refractive index, leading to an experimental determination of the c33 elastic constant, which was found to be 47.9 GPa. Additionally the results of the conducted studies enabled the analytical determination of all components of the elastic property tensor of the investigated material.}, keywords = {}, pubstate = {published}, tppubtype = {article} } High-resolution Brillouin spectroscopy was employed to investigate the anisotropy in surface wave velocities within a bulk single crystal of Sb2Te3, a well-known layered van der Waals material. By leveraging the bulk elastic constants derived from various simulation methods, we were able to theoretically calculate the distribution of surface acoustic phonon velocities on the cleavage plane of the material. Upon analyzing multiple simulation results, it became evident that the most significant discrepancies arose in the calculations of the elastic constant c33, with values ranging from 48 to 98 GPa. Consequently, a direct measurement of the c33 elastic constant for Sb2Te3 was attempted. Through our ellipsometry results, we determined both the real and imaginary components of the refractive index, leading to an experimental determination of the c33 elastic constant, which was found to be 47.9 GPa. Additionally the results of the conducted studies enabled the analytical determination of all components of the elastic property tensor of the investigated material. |
| 124. | Piotr Graczyk, Bivas Rana, Aleksandra Trzaskowska, B K Mahato, Jarosław W. Kłos, Maciej Krawczyk, A Barman Ultrasonics, 148 , pp. 107522, 2025, ISSN: 0041-624X. @article{GRACZYK2025107522b, title = {Optical excitation and detection of high-frequency Sezawa modes in Si/SiO2 system decorated with Ni80Fe20 nanodot arrays}, author = {Piotr Graczyk and Bivas Rana and Aleksandra Trzaskowska and B K Mahato and Jarosław W. Kłos and Maciej Krawczyk and A Barman}, url = {https://www.sciencedirect.com/science/article/pii/S0041624X24002853}, doi = {https://doi.org/10.1016/j.ultras.2024.107522}, issn = {0041-624X}, year = {2025}, date = {2025-01-01}, journal = {Ultrasonics}, volume = {148}, pages = {107522}, abstract = {Surface acoustic waves have emerged as one of the potential candidates for the development of next-generation wave-based information and computing technologies. For practical devices, it is essential to develop the excitation techniques for different types of surface acoustic waves, especially at higher microwave frequencies, and to tailor their frequency versus wave vector characteristics. We show that this can be done by using ultrashort laser pulses incident on the surface of a multilayer decorated with a periodic array of metallic nanodots. Specifically, we study surface acoustic waves in the dielectric substrate Si/SiO2 decorated with a square lattice of thin Ni80Fe20 (Py) dots. Using a femtosecond laser-based optical pump–probe measurement, we detect a number of high-frequency phononic modes. By performing finite element simulations, we identify them as Sezawa modes from the second and third Brillouin zone in addition to the modes confined within the Py dots. The frequency of the Sezawa modes strongly depends on the period of the Py dots and varies in the range between 5 to 15 GHz. Both types of waves cover the same frequency range for Py dots with period less than 400 nm, providing a promising system for magnetoelastic studies.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Surface acoustic waves have emerged as one of the potential candidates for the development of next-generation wave-based information and computing technologies. For practical devices, it is essential to develop the excitation techniques for different types of surface acoustic waves, especially at higher microwave frequencies, and to tailor their frequency versus wave vector characteristics. We show that this can be done by using ultrashort laser pulses incident on the surface of a multilayer decorated with a periodic array of metallic nanodots. Specifically, we study surface acoustic waves in the dielectric substrate Si/SiO2 decorated with a square lattice of thin Ni80Fe20 (Py) dots. Using a femtosecond laser-based optical pump–probe measurement, we detect a number of high-frequency phononic modes. By performing finite element simulations, we identify them as Sezawa modes from the second and third Brillouin zone in addition to the modes confined within the Py dots. The frequency of the Sezawa modes strongly depends on the period of the Py dots and varies in the range between 5 to 15 GHz. Both types of waves cover the same frequency range for Py dots with period less than 400 nm, providing a promising system for magnetoelastic studies. |
| 123. | Krzysztof Szulc, Mateusz Zelent, Maciej Krawczyk APL Materials, 13 (9), pp. 091108, 2025, ISSN: 2166-532X. @article{10.1063/5.0277362, title = {Multifunctional magnonic platform based on the interplay between spin-wave waveguide and nanodots with PMA and DMI}, author = {Krzysztof Szulc and Mateusz Zelent and Maciej Krawczyk}, url = {https://doi.org/10.1063/5.0277362}, doi = {10.1063/5.0277362}, issn = {2166-532X}, year = {2025}, date = {2025-01-01}, journal = {APL Materials}, volume = {13}, number = {9}, pages = {091108}, abstract = {Materials with perpendicular magnetic anisotropy (PMA) and antisymmetric exchange interactions are widely explored in spintronics but are of limited use in magnonics due to high damping. We present a hybrid magnonic crystal composed of a chain of circular nanodots with strong PMA and Dzyaloshinskii–Moriya interaction (DMI), positioned above a spin-wave waveguide made of permalloy. Due to the dipolar coupling between the subsystems, a strongly bound hybrid magnetization texture is formed, with two stable magnetization states in the nanodots: a single-domain state and an egg-shaped skyrmion state, allowing reprogramming of the system properties. Numerical results show complex spin-wave spectra with several key features for magnonics: programmable Bragg and non-Bragg bandgaps correlated with magnon–magnon couplings, the flat bands and bound states for the skyrmion state, and exclusively waveguide-dominated modes for the single-domain state. With these properties, the proposed hybrid magnonic crystal has different functionalities that overcome the damping limitations of materials with PMA and DMI and open up potential applications in spin-wave filtering, spin-wave generation, quantum magnonics, and analog magnonics, in particular in the realization of magnonic neural networks.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Materials with perpendicular magnetic anisotropy (PMA) and antisymmetric exchange interactions are widely explored in spintronics but are of limited use in magnonics due to high damping. We present a hybrid magnonic crystal composed of a chain of circular nanodots with strong PMA and Dzyaloshinskii–Moriya interaction (DMI), positioned above a spin-wave waveguide made of permalloy. Due to the dipolar coupling between the subsystems, a strongly bound hybrid magnetization texture is formed, with two stable magnetization states in the nanodots: a single-domain state and an egg-shaped skyrmion state, allowing reprogramming of the system properties. Numerical results show complex spin-wave spectra with several key features for magnonics: programmable Bragg and non-Bragg bandgaps correlated with magnon–magnon couplings, the flat bands and bound states for the skyrmion state, and exclusively waveguide-dominated modes for the single-domain state. With these properties, the proposed hybrid magnonic crystal has different functionalities that overcome the damping limitations of materials with PMA and DMI and open up potential applications in spin-wave filtering, spin-wave generation, quantum magnonics, and analog magnonics, in particular in the realization of magnonic neural networks. |
| 122. | S A Bunyaev, G O Kharchenko, R V Verba, Mathieu Moalic, Maciej Krawczyk, M Urbánek, K Y Guslienko, G N Kakazei Controlling spin textures of magnetic nanodots using an antidot matrix Low Temperature Physics, 51 (8), pp. 1017-1022, 2025, ISSN: 1063-777X. @article{10.1063/10.0038648, title = {Controlling spin textures of magnetic nanodots using an antidot matrix}, author = {S A Bunyaev and G O Kharchenko and R V Verba and Mathieu Moalic and Maciej Krawczyk and M Urbánek and K Y Guslienko and G N Kakazei}, url = {https://doi.org/10.1063/10.0038648}, doi = {10.1063/10.0038648}, issn = {1063-777X}, year = {2025}, date = {2025-01-01}, journal = {Low Temperature Physics}, volume = {51}, number = {8}, pages = {1017-1022}, abstract = {We present a study of the magnetic properties of circular nanodots placed inside or in the vicinity of a circular hole in the perpendicularly magnetized antidot matrix. Micromagnetic simulations were performed to investigate the remanent magnetization configurations of the nanodots as a function of their vertical position relative to the matrix. The results demonstrate that the strength of the radial component of antidot matrix stray fields varies significantly along the vertical coordinate. This change influences the remanent state of nanodots, leading, depending on their location, to the stabilization of several magnetization configurations: radial vortex, curled vortex, or single-domain state. It was found that placing the dot at few nanometers below or above the matrix allows to stabilize the vortex state for a nanodot with the smallest diameter. This result provides a hint to tailor the magnetic properties of nanodots for their applications in spintronic and magnonic devices.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We present a study of the magnetic properties of circular nanodots placed inside or in the vicinity of a circular hole in the perpendicularly magnetized antidot matrix. Micromagnetic simulations were performed to investigate the remanent magnetization configurations of the nanodots as a function of their vertical position relative to the matrix. The results demonstrate that the strength of the radial component of antidot matrix stray fields varies significantly along the vertical coordinate. This change influences the remanent state of nanodots, leading, depending on their location, to the stabilization of several magnetization configurations: radial vortex, curled vortex, or single-domain state. It was found that placing the dot at few nanometers below or above the matrix allows to stabilize the vortex state for a nanodot with the smallest diameter. This result provides a hint to tailor the magnetic properties of nanodots for their applications in spintronic and magnonic devices. |
| 121. | Dariia Popadiuk, Andriy Vovk, Sergey A Bunyaev, Gleb N Kakazei, João P Araújo, Pavel Strichovanec, Pedro A Algarabel, Vladimir Golub, Anatolii F Kravets, Vladislav Korenivski, Aleksandra Trzaskowska Journal of Applied Physics, 137 (12), pp. 123902, 2025, ISSN: 0021-8979. @article{10.1063/5.0255241, title = {Spin waves in Co2FeGe films}, author = {Dariia Popadiuk and Andriy Vovk and Sergey A Bunyaev and Gleb N Kakazei and João P Araújo and Pavel Strichovanec and Pedro A Algarabel and Vladimir Golub and Anatolii F Kravets and Vladislav Korenivski and Aleksandra Trzaskowska}, url = {https://doi.org/10.1063/5.0255241}, doi = {10.1063/5.0255241}, issn = {0021-8979}, year = {2025}, date = {2025-01-01}, journal = {Journal of Applied Physics}, volume = {137}, number = {12}, pages = {123902}, abstract = {The dynamic magnetic properties of full Heusler alloy thin films of Co 2FeGe, grown on MgO (001) substrates under different thermal conditions, were investigated. Brillouin light scattering and ferromagnetic resonance measurements revealed that depositing at room temperature followed by annealing at 300 °C for 1 h produces the best results for maximizing magnetization, exchange stiffness, and minimizing spin-dynamic dissipation in the films, which are desirable characteristics for high-speed spintronic devices. Additionally, strong hybridization of spin waves in the Damon–Eshbach geometry was observed, which is attractive for applications in magnonic signal processing circuits.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The dynamic magnetic properties of full Heusler alloy thin films of Co 2FeGe, grown on MgO (001) substrates under different thermal conditions, were investigated. Brillouin light scattering and ferromagnetic resonance measurements revealed that depositing at room temperature followed by annealing at 300 °C for 1 h produces the best results for maximizing magnetization, exchange stiffness, and minimizing spin-dynamic dissipation in the films, which are desirable characteristics for high-speed spintronic devices. Additionally, strong hybridization of spin waves in the Damon–Eshbach geometry was observed, which is attractive for applications in magnonic signal processing circuits. |
| 120. | Tomasz P. Lehmann, Aleksandra Trzaskowska, Ewa Pruszyńska-Oszmałek, Paweł Kołodziejski, Magdalena Wojtków, Celina Pezowicz, Sławomir Mielcarek, Agnieszka Hertel, Paweł P. Jagodziński, Maciej Głowacki Structural and biomechanical analysis of femurs from mice treated with diclofenac, miR-15b and miR-365 27 (2), pp. 199–209, 2025. @article{Lehmann2025-ar, title = {Structural and biomechanical analysis of femurs from mice treated with diclofenac, miR-15b and miR-365}, author = {Tomasz P. Lehmann and Aleksandra Trzaskowska and Ewa Pruszyńska-Oszmałek and Paweł Kołodziejski and Magdalena Wojtków and Celina Pezowicz and Sławomir Mielcarek and Agnieszka Hertel and Paweł P. Jagodziński and Maciej Głowacki}, year = {2025}, date = {2025-01-01}, volume = {27}, number = {2}, pages = {199--209}, address = {Poland}, abstract = {Purpose: Nonsteroidal anti-inflammatory drugs (NSAIDs) are used to treat pain, but they have side effects, including the inhibition of bone healing. Diclofenac (DF), a member of the NSAID group, affects bone health adversely. One potential approach to protect bones from the effects of NSAIDs involves the administration of short nucleic acids, such as microRNAs (miRNAs). This study aimed to determine whether two specific miRNAs, miR-15b and miR-365, could mitigate the effects of DF on bone. Methods: We used the C57BL/6J mouse strain and the MC3T3-E1 preosteoblast cell line derived from this mouse strain. Female C57BL/6J mice were treated with DF and miR-15b or miR-365 mimics. After euthanising the mice, we analysed their femurs using micro-computed tomography ($mu$CT) and dynamic mechanical analysis (DMA). In addition, we performed experiments in cultured MC3T3-E1 cells, which were transfected with either miR- 15b or miR-365. We assessed the relative mRNA levels of osteoblast differentiation markers using real-time PCR. Results: Our findings indicated that miR-15b and miR-365 were effective in reversing the detrimental effects of DF on bone mineral density. DF decreased the bone's storage modulus (E'), while miR-15b and miR-365 ameliorated this effect. In the preosteoblast MC3T3-E1 cells, DF did not significantly regulate marker genes; however, the administration of miR-15b and miR-365 reduced the gene expression of Runx2, Alp, and Satb2. Conclusions: In summary, the impact of DF on the structural and mechanical properties of bone was not mediated by gene regulation in osteoblasts. However, osteoblasts were responsive to the administration of miR-15b and miR-365.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Purpose: Nonsteroidal anti-inflammatory drugs (NSAIDs) are used to treat pain, but they have side effects, including the inhibition of bone healing. Diclofenac (DF), a member of the NSAID group, affects bone health adversely. One potential approach to protect bones from the effects of NSAIDs involves the administration of short nucleic acids, such as microRNAs (miRNAs). This study aimed to determine whether two specific miRNAs, miR-15b and miR-365, could mitigate the effects of DF on bone. Methods: We used the C57BL/6J mouse strain and the MC3T3-E1 preosteoblast cell line derived from this mouse strain. Female C57BL/6J mice were treated with DF and miR-15b or miR-365 mimics. After euthanising the mice, we analysed their femurs using micro-computed tomography ($mu$CT) and dynamic mechanical analysis (DMA). In addition, we performed experiments in cultured MC3T3-E1 cells, which were transfected with either miR- 15b or miR-365. We assessed the relative mRNA levels of osteoblast differentiation markers using real-time PCR. Results: Our findings indicated that miR-15b and miR-365 were effective in reversing the detrimental effects of DF on bone mineral density. DF decreased the bone's storage modulus (E'), while miR-15b and miR-365 ameliorated this effect. In the preosteoblast MC3T3-E1 cells, DF did not significantly regulate marker genes; however, the administration of miR-15b and miR-365 reduced the gene expression of Runx2, Alp, and Satb2. Conclusions: In summary, the impact of DF on the structural and mechanical properties of bone was not mediated by gene regulation in osteoblasts. However, osteoblasts were responsive to the administration of miR-15b and miR-365. |
| 119. | Grzegorz Centała, Jarosław W. Kłos Magneto-rotation coupling for ferromagnetic nanoelement embedded in elastic substrate Journal of Applied Physics, 137 (23), pp. 233904, 2025, ISSN: 0021-8979. @article{10.1063/5.0271755b, title = {Magneto-rotation coupling for ferromagnetic nanoelement embedded in elastic substrate}, author = {Grzegorz Centała and Jarosław W. Kłos}, url = {https://doi.org/10.1063/5.0271755}, doi = {10.1063/5.0271755}, issn = {0021-8979}, year = {2025}, date = {2025-01-01}, journal = {Journal of Applied Physics}, volume = {137}, number = {23}, pages = {233904}, abstract = {This study investigates magneto-rotational coupling as a distinct contribution to magnetoelastic interactions, which can be influenced by magnetic anisotropy. We determine magneto-rotational coupling coefficients that incorporate the shape anisotropy of a magnetic nanoelement (strip) and demonstrate that this type of coupling can be modified through geometric adjustments. Furthermore, we analyze the magneto-rotational contribution to the magnetoelastic field in a ferromagnetic strip embedded in a nonmagnetic substrate. Both Rayleigh and Love waves are considered sources of the magnetoelastic field, and we examine how the strength of the magneto-rotational coupling varies with the direction of the magnetization, and the aspect ratio of the strip cross section. We analyze the changes in the magneto-rotational contribution to the magnetoelastic field with an increasing thickness-to-width ratio, assuming a fixed magnetization direction corresponding to the strongest magnetoelastic coupling. For Love waves, the contribution of the out-of-plane component increases monotonically, while that of the in-plane component decreases monotonically. In the case of the Rayleigh wave, only the out-of-plane component contributes, and it approaches zero as the cross section becomes square. These findings enhance the understanding of magneto-rotational coupling in magnonic nanostructures.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This study investigates magneto-rotational coupling as a distinct contribution to magnetoelastic interactions, which can be influenced by magnetic anisotropy. We determine magneto-rotational coupling coefficients that incorporate the shape anisotropy of a magnetic nanoelement (strip) and demonstrate that this type of coupling can be modified through geometric adjustments. Furthermore, we analyze the magneto-rotational contribution to the magnetoelastic field in a ferromagnetic strip embedded in a nonmagnetic substrate. Both Rayleigh and Love waves are considered sources of the magnetoelastic field, and we examine how the strength of the magneto-rotational coupling varies with the direction of the magnetization, and the aspect ratio of the strip cross section. We analyze the changes in the magneto-rotational contribution to the magnetoelastic field with an increasing thickness-to-width ratio, assuming a fixed magnetization direction corresponding to the strongest magnetoelastic coupling. For Love waves, the contribution of the out-of-plane component increases monotonically, while that of the in-plane component decreases monotonically. In the case of the Rayleigh wave, only the out-of-plane component contributes, and it approaches zero as the cross section becomes square. These findings enhance the understanding of magneto-rotational coupling in magnonic nanostructures. |
| 118. | Rob den Teuling, Ritesh Das, Artem V Bondarenko, Elena V. Tartakovskaya, Gerrit E W Bauer, Yaroslav M Blanter Dipolar-exchange spin waves in thin bilayers Low Temperature Physics, 51 (8), pp. 998-1003, 2025, ISSN: 1063-777X. @article{10.1063/10.0038642, title = {Dipolar-exchange spin waves in thin bilayers}, author = {Rob den Teuling and Ritesh Das and Artem V Bondarenko and Elena V. Tartakovskaya and Gerrit E W Bauer and Yaroslav M Blanter}, url = {https://doi.org/10.1063/10.0038642}, doi = {10.1063/10.0038642}, issn = {1063-777X}, year = {2025}, date = {2025-01-01}, journal = {Low Temperature Physics}, volume = {51}, number = {8}, pages = {998-1003}, abstract = {We investigate the dipolar-exchange spin wave spectrum in thin ferromagnetic bilayers with in-plane magnetization, incorporating interlayer exchange coupling and intra- and interlayer dipolar interactions. In the continuum approximation, we analyze the nonreciprocity of propagating magnetic stray fields emitted by spin waves as a function of the relative orientation of the layer magnetizations that are observable by magnetometry of synthetic antiferromagnets or weakly coupled type-A van der Waals antiferromagnetic bilayers as a function of an applied magnetic field.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We investigate the dipolar-exchange spin wave spectrum in thin ferromagnetic bilayers with in-plane magnetization, incorporating interlayer exchange coupling and intra- and interlayer dipolar interactions. In the continuum approximation, we analyze the nonreciprocity of propagating magnetic stray fields emitted by spin waves as a function of the relative orientation of the layer magnetizations that are observable by magnetometry of synthetic antiferromagnets or weakly coupled type-A van der Waals antiferromagnetic bilayers as a function of an applied magnetic field. |
| 117. | K Y Guslienko, Elena V. Tartakovskaya Hopf index of the toroidal magnetic hopfions in cylindrical and spherical dots Low Temperature Physics, 51 (6), pp. 695-699, 2025, ISSN: 1063-777X. @article{10.1063/10.0036746, title = {Hopf index of the toroidal magnetic hopfions in cylindrical and spherical dots}, author = {K Y Guslienko and Elena V. Tartakovskaya}, url = {https://doi.org/10.1063/10.0036746}, doi = {10.1063/10.0036746}, issn = {1063-777X}, year = {2025}, date = {2025-01-01}, journal = {Low Temperature Physics}, volume = {51}, number = {6}, pages = {695-699}, abstract = {Topologically non-trivial 3D magnetization textures in the restricted curvilinear geometries are considered. 3D topological charges (the Hopf indices) are calculated for a particular case of 3D topological magnetic solitons, the toroidal hopfions in cylindrical and spherical ferromagnetic dots. The calculation method is based on the theory of toroidal hopfions developed within the classical field theory for infinite media. We exploited the property of the toroidal hopfions that the Hopf index density in any curvilinear coordinate system can be expressed as a Jacobian of the transformation from the toroidal coordinates to new coordinates, which match to the magnetic particle symmetry. The calculated Hopf indices are not integer and approach integer values increasing the dot sizes.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Topologically non-trivial 3D magnetization textures in the restricted curvilinear geometries are considered. 3D topological charges (the Hopf indices) are calculated for a particular case of 3D topological magnetic solitons, the toroidal hopfions in cylindrical and spherical ferromagnetic dots. The calculation method is based on the theory of toroidal hopfions developed within the classical field theory for infinite media. We exploited the property of the toroidal hopfions that the Hopf index density in any curvilinear coordinate system can be expressed as a Jacobian of the transformation from the toroidal coordinates to new coordinates, which match to the magnetic particle symmetry. The calculated Hopf indices are not integer and approach integer values increasing the dot sizes. |
| 116. | Vladyslav Borynskyi, Yulia Kharlan, Roman Verba Low Temperature Physics, 51 (8), pp. 986-992, 2025, ISSN: 1063-777X. @article{10.1063/10.0038640, title = {Effect of interfacial Dzyaloshinskii–Moriya interaction on three-magnon processes in thin magnetic nanodots}, author = {Vladyslav Borynskyi and Yulia Kharlan and Roman Verba}, url = {https://doi.org/10.1063/10.0038640}, doi = {10.1063/10.0038640}, issn = {1063-777X}, year = {2025}, date = {2025-01-01}, journal = {Low Temperature Physics}, volume = {51}, number = {8}, pages = {986-992}, abstract = {Magnetic materials are familiar with their nonlinear dynamics, which becomes especially rich and efficient at the nanoscale. Precise control of nonlinear interaction is of high interest for various applications. Recently, it was shown that controllable symmetry breaking of magnetic state, induced, e.g., by a magnetic field perturbation, provides an efficient tool for manipulation of multi-magnon processes, which is especially efficient for three-magnon splitting and confluence. In this work, we investigate the effect of interfacial Dzyaloshinskii–Moriya interaction (IDMI)—an antisymmetric exchange interaction—on three-magnon processes. It is shown that IDMI affects the selection rules for three-magnon processes and their efficiency in all the considered geometries of thin magnetic nanodots: saturated magnetic dot with in-plane or perpendicular magnetization and vortex-state magnetic disk. Our results show the need for accurate consideration of possible effects of IDMI or other non-symmetric interactions when designing magnetic or spintronic devices with a controllable nonlinear response.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Magnetic materials are familiar with their nonlinear dynamics, which becomes especially rich and efficient at the nanoscale. Precise control of nonlinear interaction is of high interest for various applications. Recently, it was shown that controllable symmetry breaking of magnetic state, induced, e.g., by a magnetic field perturbation, provides an efficient tool for manipulation of multi-magnon processes, which is especially efficient for three-magnon splitting and confluence. In this work, we investigate the effect of interfacial Dzyaloshinskii–Moriya interaction (IDMI)—an antisymmetric exchange interaction—on three-magnon processes. It is shown that IDMI affects the selection rules for three-magnon processes and their efficiency in all the considered geometries of thin magnetic nanodots: saturated magnetic dot with in-plane or perpendicular magnetization and vortex-state magnetic disk. Our results show the need for accurate consideration of possible effects of IDMI or other non-symmetric interactions when designing magnetic or spintronic devices with a controllable nonlinear response. |
| 115. | Yulia Kharlan, V Chernenko, O Salyuk, S Lanceros-Mendez, H Hosoda, V Golub Tensile stresses in NiMnGa laminate composite framed by soft magnetic foils Low Temperature Physics, 51 (8), pp. 1013-1016, 2025, ISSN: 1063-777X. @article{10.1063/10.0038647, title = {Tensile stresses in NiMnGa laminate composite framed by soft magnetic foils}, author = {Yulia Kharlan and V Chernenko and O Salyuk and S Lanceros-Mendez and H Hosoda and V Golub}, url = {https://doi.org/10.1063/10.0038647}, doi = {10.1063/10.0038647}, issn = {1063-777X}, year = {2025}, date = {2025-01-01}, journal = {Low Temperature Physics}, volume = {51}, number = {8}, pages = {1013-1016}, abstract = {The magnetically induced stresses in “Fe/Ni–Mn–Ga single crystalline particles/Fe” laminate composites have been studied depending on the thickness of the framing Fe foils and the distances between them. It evaluated the magnetically induced repulsive force between the two Fe foils which results in additional tensile stress of NiMnGa particles experimentally observed before. The presented calculation shows the way to improve the magnetostrain performance of laminate composite actuators.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The magnetically induced stresses in “Fe/Ni–Mn–Ga single crystalline particles/Fe” laminate composites have been studied depending on the thickness of the framing Fe foils and the distances between them. It evaluated the magnetically induced repulsive force between the two Fe foils which results in additional tensile stress of NiMnGa particles experimentally observed before. The presented calculation shows the way to improve the magnetostrain performance of laminate composite actuators. |
2024 |
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| 114. | Ryszard Gieniusz, Paweł Gruszecki, Jan Kisielewski, Anuj Kumar Dhiman, Michal Matczak, Zbigniew Kurant, Iosif Sveklo, Urszula Guzowska, Maria Tekielak, Maciej Krawczyk, Feliks Stobiecki, Andrzej Maziewski Spin wave frequency hysteresis in Ir/Co/Pt multilayers with Dzyaloshinskii-Moriya interaction Phys. Rev. B, 110 , pp. 184410, 2024. @article{PhysRevB.110.184410, title = {Spin wave frequency hysteresis in Ir/Co/Pt multilayers with Dzyaloshinskii-Moriya interaction}, author = {Ryszard Gieniusz and Paweł Gruszecki and Jan Kisielewski and Anuj Kumar Dhiman and Michal Matczak and Zbigniew Kurant and Iosif Sveklo and Urszula Guzowska and Maria Tekielak and Maciej Krawczyk and Feliks Stobiecki and Andrzej Maziewski}, url = {https://link.aps.org/doi/10.1103/PhysRevB.110.184410}, doi = {10.1103/PhysRevB.110.184410}, year = {2024}, date = {2024-11-14}, journal = {Phys. Rev. B}, volume = {110}, pages = {184410}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
| 113. | Sreedevi Janardhanan, Maciej Krawczyk, Aleksandra Trzaskowska Spin-Wave Dynamics in Ultra-thin Ferromagnetic Films, Patterned, and Non-patterned Bandyopadhyay, Supriyo, Barman, Anjan (Ed.): Nanomagnets as Dynamical Systems: Physics and Applications, pp. 33–69, Springer Nature Switzerland, Cham, 2024, ISBN: 978-3-031-73191-4. @inbook{Janardhanan2024b, title = {Spin-Wave Dynamics in Ultra-thin Ferromagnetic Films, Patterned, and Non-patterned}, author = {Sreedevi Janardhanan and Maciej Krawczyk and Aleksandra Trzaskowska}, editor = {Supriyo Bandyopadhyay and Anjan Barman}, url = {https://doi.org/10.1007/978-3-031-73191-4_2}, doi = {10.1007/978-3-031-73191-4_2}, isbn = {978-3-031-73191-4}, year = {2024}, date = {2024-11-10}, booktitle = {Nanomagnets as Dynamical Systems: Physics and Applications}, pages = {33--69}, publisher = {Springer Nature Switzerland}, address = {Cham}, abstract = {Exploring spin-waveSpin wave (SW) dynamics opens new avenues for technological applications across various fields. This chapter provides a comprehensive review of spin-waveSpin wave (SW) dynamics in both patterned and non-patterned ferromagnetic thin films, and emphasizes the significance of perpendicular magnetic anisotropyPerpendicular magnetic anisotropy (PMA) in this context as well. The chapter begins with an overview of the basic concept and relevance of spin wavesSpin wave (SW), followed by a detailed discussion of Brillouin light scatteringBrillouin light scattering (BLS) methodology. We explore the unique properties of spin wavesSpin wave (SW) in patterned films, such as magnonic crystalsMagnonic crystals (MC), and a comparative study with the behaviour in continuous films has been presented in detail. The future perspective from technological point of view of spin-wave research is vast, ranging from high-frequency data transmission to quantum information processing. Here we highlighted applications encompass spin-wave logic devices, magnonic waveguide, quantum computingSpin wave computing, and the role of spin wavesSpin wave (SW) in the development of novel materials with tailored magnetic properties. Finally, this review addresses the challenges associated with achieving precise control over spin-waveSpin wave (SW) propagation, elucidating spin-waveSpin wave (SW) interactions at the nanoscale, and integrating spin-waveSpin wave (SW) technology with existing technological frameworks.}, keywords = {}, pubstate = {published}, tppubtype = {inbook} } Exploring spin-waveSpin wave (SW) dynamics opens new avenues for technological applications across various fields. This chapter provides a comprehensive review of spin-waveSpin wave (SW) dynamics in both patterned and non-patterned ferromagnetic thin films, and emphasizes the significance of perpendicular magnetic anisotropyPerpendicular magnetic anisotropy (PMA) in this context as well. The chapter begins with an overview of the basic concept and relevance of spin wavesSpin wave (SW), followed by a detailed discussion of Brillouin light scatteringBrillouin light scattering (BLS) methodology. We explore the unique properties of spin wavesSpin wave (SW) in patterned films, such as magnonic crystalsMagnonic crystals (MC), and a comparative study with the behaviour in continuous films has been presented in detail. The future perspective from technological point of view of spin-wave research is vast, ranging from high-frequency data transmission to quantum information processing. Here we highlighted applications encompass spin-wave logic devices, magnonic waveguide, quantum computingSpin wave computing, and the role of spin wavesSpin wave (SW) in the development of novel materials with tailored magnetic properties. Finally, this review addresses the challenges associated with achieving precise control over spin-waveSpin wave (SW) propagation, elucidating spin-waveSpin wave (SW) interactions at the nanoscale, and integrating spin-waveSpin wave (SW) technology with existing technological frameworks. |
| 112. | Bivas Rana, YoshiChika Otani Development of Magnonics with Voltage-Controlled Magnetic Anisotropy Bandyopadhyay, Supriyo, Barman, Anjan (Ed.): Nanomagnets as Dynamical Systems: Physics and Applications, pp. 71–96, Springer Nature Switzerland, Cham, 2024, ISBN: 978-3-031-73191-4. @inbook{Rana2024, title = {Development of Magnonics with Voltage-Controlled Magnetic Anisotropy}, author = {Bivas Rana and YoshiChika Otani}, editor = {Supriyo Bandyopadhyay and Anjan Barman}, url = {https://doi.org/10.1007/978-3-031-73191-4_3}, doi = {10.1007/978-3-031-73191-4_3}, isbn = {978-3-031-73191-4}, year = {2024}, date = {2024-11-10}, booktitle = {Nanomagnets as Dynamical Systems: Physics and Applications}, pages = {71--96}, publisher = {Springer Nature Switzerland}, address = {Cham}, abstract = {This chapter discusses the origin and essential features of interfacial magnetic anisotropies and voltage-controlled magnetic anisotropy (VCMAVoltage control of magnetic anisotropy (VCMA)) in ultrathin ferromagnetFerromagnet/oxide heterostructures. Various other electric field-induced methods for controlling magnetic properties and the advantages of VCMAVoltage control of magnetic anisotropy (VCMA) over them are thoroughly discussed. The recent progress of magnonics with VCMAVoltage control of magnetic anisotropy (VCMA) is described in detail. In particular, we discuss the linear and parametric excitation of ferromagnetic and spin waveSpin wave (SW) resonance; the essential properties of spin wavesSpin wave (SW) guided through reconfigurable nanochannels; the manipulation of spin waveSpin wave (SW) frequency, phase, wavevector, magnonic band structures, and damping parameters in detail. A brief discussion follows on the excitation and manipulation of spin wavesSpin wave (SW) by various other direct and indirect electric field-induced methods. The chapter concludes by briefly describing some open challenges in this field.}, keywords = {}, pubstate = {published}, tppubtype = {inbook} } This chapter discusses the origin and essential features of interfacial magnetic anisotropies and voltage-controlled magnetic anisotropy (VCMAVoltage control of magnetic anisotropy (VCMA)) in ultrathin ferromagnetFerromagnet/oxide heterostructures. Various other electric field-induced methods for controlling magnetic properties and the advantages of VCMAVoltage control of magnetic anisotropy (VCMA) over them are thoroughly discussed. The recent progress of magnonics with VCMAVoltage control of magnetic anisotropy (VCMA) is described in detail. In particular, we discuss the linear and parametric excitation of ferromagnetic and spin waveSpin wave (SW) resonance; the essential properties of spin wavesSpin wave (SW) guided through reconfigurable nanochannels; the manipulation of spin waveSpin wave (SW) frequency, phase, wavevector, magnonic band structures, and damping parameters in detail. A brief discussion follows on the excitation and manipulation of spin wavesSpin wave (SW) by various other direct and indirect electric field-induced methods. The chapter concludes by briefly describing some open challenges in this field. |
| 111. | Marceli Kaczmarski, Jacek Jenczyk, Bogusław Mróz Phason and Amplitudon Modes in K3Na(SeO4)2 Crystal Symmetry, 16 (11), 2024, ISSN: 2073-8994. @article{sym16111482, title = {Phason and Amplitudon Modes in K3Na(SeO4)2 Crystal}, author = {Marceli Kaczmarski and Jacek Jenczyk and Bogusław Mróz}, url = {https://www.mdpi.com/2073-8994/16/11/1482}, doi = {10.3390/sym16111482}, issn = {2073-8994}, year = {2024}, date = {2024-11-06}, journal = {Symmetry}, volume = {16}, number = {11}, abstract = {For the first time, the Nambu–Goldstone optical mode has been observed in ferroelastic crystals. The amplitudon and phason modes were identified in the Raman spectra of the K3Na(SeO4)2 (KNSe) crystal. We discuss the occurrence of such lattice vibration with regard to the possible presence of an incommensurate (IC) phase. The potential scenario of the dynamics of the SO4 tetrahedron leading to the appearance of an IC phase, accompanied by critical temperature behavior of two external vibrations of Ag symmetry, is given together with the molecular mechanism of the phase transitions in the material studied. The effect of the spatial reorganization of the crystal lattice associated with the ferroelastic domains of the KNSe crystal of W and W′ types is also discussed. We show that the emergence of such a domain structure may also be a source of incommensurability.}, keywords = {}, pubstate = {published}, tppubtype = {article} } For the first time, the Nambu–Goldstone optical mode has been observed in ferroelastic crystals. The amplitudon and phason modes were identified in the Raman spectra of the K3Na(SeO4)2 (KNSe) crystal. We discuss the occurrence of such lattice vibration with regard to the possible presence of an incommensurate (IC) phase. The potential scenario of the dynamics of the SO4 tetrahedron leading to the appearance of an IC phase, accompanied by critical temperature behavior of two external vibrations of Ag symmetry, is given together with the molecular mechanism of the phase transitions in the material studied. The effect of the spatial reorganization of the crystal lattice associated with the ferroelastic domains of the KNSe crystal of W and W′ types is also discussed. We show that the emergence of such a domain structure may also be a source of incommensurability. |
| 110. | Anuj K Dhiman, Nikodem Leśniewski, Ryszard Gieniusz, Jan Kisielewski, Piotr Mazalski, Zbigniew Kurant, Michał Matczak, Feliks Stobiecki, Maciej Krawczyk, Artem Lynnyk, Andrzej Maziewski, Paweł Gruszecki APL Materials, 12 (11), pp. 111106, 2024, ISSN: 2166-532X. @article{10.1063/5.0227380, title = {Reconfigurable magnonic crystals: Spin wave propagation in Pt/Co multilayer in saturated and stripe domain phase}, author = {Anuj K Dhiman and Nikodem Leśniewski and Ryszard Gieniusz and Jan Kisielewski and Piotr Mazalski and Zbigniew Kurant and Michał Matczak and Feliks Stobiecki and Maciej Krawczyk and Artem Lynnyk and Andrzej Maziewski and Paweł Gruszecki}, url = {https://doi.org/10.1063/5.0227380}, doi = {10.1063/5.0227380}, issn = {2166-532X}, year = {2024}, date = {2024-11-04}, journal = {APL Materials}, volume = {12}, number = {11}, pages = {111106}, abstract = {To control the spin wave (SW) propagation, external energy sources such as magnetic fields, electric currents, or complex nanopatterning are used, which can be challenging at the deep nanoscale level. In this work, we overcome such limitations by demonstrating SW propagation in Pt/Co multilayers at a remanent state controlled by stripe domain patterns, using Brillouin light scattering and micromagnetic simulations. We show that parallel stripes with a periodicity around 100 nm exhibit reconfigurability, as the stripes can be rotated by applying the in-plane field without damaging their shape. This allows us to study SW propagation perpendicular and parallel to the stripes. We observe multimodal SW spectra—three bands in perpendicular and five in parallel geometry. Numerical results allow us to identify all observed modes and to explain the differences between two configurations by the unequal contribution of all three magnetization components in the SW dynamics. We find that the experimentally measured non-reciprocal dispersion (for the wavevector perpendicular to the stripes) is not the breaking of time-symmetry but the asymmetry in intensity of the measured signals of two different low-frequency modes, which is due to the inhomogeneous SW amplitude distribution over the multilayer thickness and the limited light penetration depth. Our results pave the way for easy reprogrammability and high energy efficiency in nanomagnonics.}, keywords = {}, pubstate = {published}, tppubtype = {article} } To control the spin wave (SW) propagation, external energy sources such as magnetic fields, electric currents, or complex nanopatterning are used, which can be challenging at the deep nanoscale level. In this work, we overcome such limitations by demonstrating SW propagation in Pt/Co multilayers at a remanent state controlled by stripe domain patterns, using Brillouin light scattering and micromagnetic simulations. We show that parallel stripes with a periodicity around 100 nm exhibit reconfigurability, as the stripes can be rotated by applying the in-plane field without damaging their shape. This allows us to study SW propagation perpendicular and parallel to the stripes. We observe multimodal SW spectra—three bands in perpendicular and five in parallel geometry. Numerical results allow us to identify all observed modes and to explain the differences between two configurations by the unequal contribution of all three magnetization components in the SW dynamics. We find that the experimentally measured non-reciprocal dispersion (for the wavevector perpendicular to the stripes) is not the breaking of time-symmetry but the asymmetry in intensity of the measured signals of two different low-frequency modes, which is due to the inhomogeneous SW amplitude distribution over the multilayer thickness and the limited light penetration depth. Our results pave the way for easy reprogrammability and high energy efficiency in nanomagnonics. |
| 109. | Yulia Kharlan, Krzysztof Szulc, Jarosław W. Kłos, Grzegorz Centała Tunable magnonic crystal in a hybrid superconductor-ferrimagnet nanostructure Scientific Reports, 14 (1), pp. 25594, 2024, ISSN: 2045-2322. @article{Kharlan2024, title = {Tunable magnonic crystal in a hybrid superconductor-ferrimagnet nanostructure}, author = {Yulia Kharlan and Krzysztof Szulc and Jarosław W. Kłos and Grzegorz Centała}, url = {https://doi.org/10.1038/s41598-024-75492-0}, doi = {10.1038/s41598-024-75492-0}, issn = {2045-2322}, year = {2024}, date = {2024-10-26}, journal = {Scientific Reports}, volume = {14}, number = {1}, pages = {25594}, abstract = {One of the most intriguing properties of magnonic systems is their reconfigurability, where an external magnetic field alters the static magnetic configuration to influence magnetization dynamics. In this paper, we present an alternative approach to tunable magnonic systems. We studied theoretically and numerically a magnonic crystal induced within a uniform magnetic layer by a periodic magnetic field pattern created by the sequence of superconducting strips. We showed that the spin-wave spectrum can be tuned by the inhomogeneous stray field of the superconductor in response to a small uniform external magnetic field. Additionally, we demonstrated that modifying the width of superconducting strips and separation between them leads to the changes in the internal field which are unprecedented in conventional magnonic structures. The paper presents the results of semi-analytical calculations for realistic structures, which are verified by finite-element method computations.}, keywords = {}, pubstate = {published}, tppubtype = {article} } One of the most intriguing properties of magnonic systems is their reconfigurability, where an external magnetic field alters the static magnetic configuration to influence magnetization dynamics. In this paper, we present an alternative approach to tunable magnonic systems. We studied theoretically and numerically a magnonic crystal induced within a uniform magnetic layer by a periodic magnetic field pattern created by the sequence of superconducting strips. We showed that the spin-wave spectrum can be tuned by the inhomogeneous stray field of the superconductor in response to a small uniform external magnetic field. Additionally, we demonstrated that modifying the width of superconducting strips and separation between them leads to the changes in the internal field which are unprecedented in conventional magnonic structures. The paper presents the results of semi-analytical calculations for realistic structures, which are verified by finite-element method computations. |
| 108. | Bivas Rana Journal of Applied Physics, 136 (15), pp. 150701, 2024, ISSN: 0021-8979. @article{10.1063/5.0233693, title = {Role of voltage-controlled magnetic anisotropy in the recent development of magnonics and spintronics}, author = {Bivas Rana}, url = {https://doi.org/10.1063/5.0233693}, doi = {10.1063/5.0233693}, issn = {0021-8979}, year = {2024}, date = {2024-10-16}, journal = {Journal of Applied Physics}, volume = {136}, number = {15}, pages = {150701}, abstract = {With significant recent progress in the thin film deposition and nanofabrication technology, a number of physical phenomena occur at the interfaces of magnetic thin films, and their heterostructures have been discovered. Consequently, the electric field-induced modulation of those interfacial properties mediated through spin–orbit coupling promises to develop magnetic material based smarter, faster, miniaturized, energy efficient spintronic devices. Among them, the electric field-induced modification of interfacial magnetic anisotropy, popularly termed as voltage-controlled magnetic anisotropy (VCMA), has attracted special attention because of its salient features. This article is devoted to reviewing the recent development of magnonics, which deals with collective precessional motion of ordered magnetic spins, i.e., spin waves (SWs), and skyrmions with chiral spin textures, with VCMA, including the perspectives of this research field. Starting with a broad introduction, the key features of VCMA and its advantages over other electric field-induced methods are highlighted. These are followed by describing the state-of-the-art of VCMA, and various other direct and indirect electric field-induced methods for magnetization reversal; controlling skyrmion dynamics; excitation, manipulation, and channeling of SWs; and tailoring magnonic bands. The critical challenges, their possible solutions, and future perspectives of this field are thoroughly discussed throughout the article.}, keywords = {}, pubstate = {published}, tppubtype = {article} } With significant recent progress in the thin film deposition and nanofabrication technology, a number of physical phenomena occur at the interfaces of magnetic thin films, and their heterostructures have been discovered. Consequently, the electric field-induced modulation of those interfacial properties mediated through spin–orbit coupling promises to develop magnetic material based smarter, faster, miniaturized, energy efficient spintronic devices. Among them, the electric field-induced modification of interfacial magnetic anisotropy, popularly termed as voltage-controlled magnetic anisotropy (VCMA), has attracted special attention because of its salient features. This article is devoted to reviewing the recent development of magnonics, which deals with collective precessional motion of ordered magnetic spins, i.e., spin waves (SWs), and skyrmions with chiral spin textures, with VCMA, including the perspectives of this research field. Starting with a broad introduction, the key features of VCMA and its advantages over other electric field-induced methods are highlighted. These are followed by describing the state-of-the-art of VCMA, and various other direct and indirect electric field-induced methods for magnetization reversal; controlling skyrmion dynamics; excitation, manipulation, and channeling of SWs; and tailoring magnonic bands. The critical challenges, their possible solutions, and future perspectives of this field are thoroughly discussed throughout the article. |
| 107. | Piotr Graczyk, Maria Pugaczowa-Michalska, Maciej Krawczyk Generation of femtosecond spin-polarized current pulses at Fe/MgO interface by quasi-static voltage Physica E: Low-dimensional Systems and Nanostructures, 165 , pp. 116120, 2024, ISSN: 1386-9477. @article{GRACZYK2025116120, title = {Generation of femtosecond spin-polarized current pulses at Fe/MgO interface by quasi-static voltage}, author = {Piotr Graczyk and Maria Pugaczowa-Michalska and Maciej Krawczyk}, url = {https://www.sciencedirect.com/science/article/pii/S1386947724002248}, doi = {https://doi.org/10.1016/j.physe.2024.116120}, issn = {1386-9477}, year = {2024}, date = {2024-10-03}, journal = {Physica E: Low-dimensional Systems and Nanostructures}, volume = {165}, pages = {116120}, abstract = {The generation of short spin-current pulses is essential for fast spintronic devices. So far, spin current pulses are generated by femtosecond laser pulses which drive spins from a ferromagnetic metal layer. However, the need for miniaturization, simplicity and energy efficiency favour electric-field control of spintronic devices over optic or thermal control. Here, we combine ab initio calculations of electronic density of states at MgO/Fe interface with continuous model for charge transport to investigate the dynamics of the spin-dependent potential. We demonstrate that the voltage-driven instability of the electronic band structure due to the electronic resonant states at the Fe/MgO interface results in the generation of the femtosecond spin-polarized current pulse with the spin polarization up to P=7 00 % that propagates from the interface to the bulk. The dynamics of the current pulses driven by the Stoner instability depends neither on the dielectric relaxation time nor on the details of how the instability is achieved by changing the voltage, i.e. as long as the voltage changes are slow (quasi-static) with respect to the time determined by the spin diffusion constant, being of the order of fs. The presence of the instability can be detected by THz time-domain spectroscopy or pump-probe techniques.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The generation of short spin-current pulses is essential for fast spintronic devices. So far, spin current pulses are generated by femtosecond laser pulses which drive spins from a ferromagnetic metal layer. However, the need for miniaturization, simplicity and energy efficiency favour electric-field control of spintronic devices over optic or thermal control. Here, we combine ab initio calculations of electronic density of states at MgO/Fe interface with continuous model for charge transport to investigate the dynamics of the spin-dependent potential. We demonstrate that the voltage-driven instability of the electronic band structure due to the electronic resonant states at the Fe/MgO interface results in the generation of the femtosecond spin-polarized current pulse with the spin polarization up to P=7 00 % that propagates from the interface to the bulk. The dynamics of the current pulses driven by the Stoner instability depends neither on the dielectric relaxation time nor on the details of how the instability is achieved by changing the voltage, i.e. as long as the voltage changes are slow (quasi-static) with respect to the time determined by the spin diffusion constant, being of the order of fs. The presence of the instability can be detected by THz time-domain spectroscopy or pump-probe techniques. |
| 106. | Sławomir Mamica Scientific Reports, 14 (1), pp. 22966, 2024, ISSN: 2045-2322. @article{mamica_spin-wave_2024, title = {Spin-wave mode coupling in the presence of the demagnetizing field in cobalt-permalloy magnonic crystals}, author = {Sławomir Mamica}, url = {https://www.nature.com/articles/s41598-024-74923-2}, doi = {10.1038/s41598-024-74923-2}, issn = {2045-2322}, year = {2024}, date = {2024-10-03}, urldate = {2024-10-11}, journal = {Scientific Reports}, volume = {14}, number = {1}, pages = {22966}, abstract = {We present the results of studies on the non-uniform frequency shift of spin wave spectrum in a two-dimensional magnonic crystal of cobalt/permalloy under the influence of external magnetic field changes. We investigate the phenomenon of coupling of modes and, as a consequence, their hybridization. By taking advantage of the fact that compressing the crystal structure along the direction of the external magnetic field leads to an enhancement of the demagnetizing field, we analyse its effect on the frequency shift of individual modes depending on their concentration in Co. We show that the consequence of this enhancement is a shift in the coupling of modes towards higher magnetic fields. This provides a potential opportunity to design which pairs of modes and in what range of fields hybridization will occur.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We present the results of studies on the non-uniform frequency shift of spin wave spectrum in a two-dimensional magnonic crystal of cobalt/permalloy under the influence of external magnetic field changes. We investigate the phenomenon of coupling of modes and, as a consequence, their hybridization. By taking advantage of the fact that compressing the crystal structure along the direction of the external magnetic field leads to an enhancement of the demagnetizing field, we analyse its effect on the frequency shift of individual modes depending on their concentration in Co. We show that the consequence of this enhancement is a shift in the coupling of modes towards higher magnetic fields. This provides a potential opportunity to design which pairs of modes and in what range of fields hybridization will occur. |
| 105. | D Panda, K K Behera, S Madhur, Bivas Rana, A Gloskovskii, Y Otani, A Barman, I Sarkar Phys. Rev. B, 110 , pp. 094424, 2024. @article{PhysRevB.110.094424, title = {Role of the nonmagnetic underlayer in controlling the electronic structure of ferromagnet/nonmagnetic-metal heterostructures}, author = {D Panda and K K Behera and S Madhur and Bivas Rana and A Gloskovskii and Y Otani and A Barman and I Sarkar}, url = {https://link.aps.org/doi/10.1103/PhysRevB.110.094424}, doi = {10.1103/PhysRevB.110.094424}, year = {2024}, date = {2024-09-18}, journal = {Phys. Rev. B}, volume = {110}, pages = {094424}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
| 104. | Shashank Shekhar, Sławomir Mielcarek, Y Otani, Bivas Rana, Aleksandra Trzaskowska Effect of the underlayer on the elastic parameters of the CoFeB/MgO heterostructures Scientific Reports, 14 (1), pp. 20259, 2024, ISSN: 2045-2322. @article{shekhar_effect_2024, title = {Effect of the underlayer on the elastic parameters of the CoFeB/MgO heterostructures}, author = {Shashank Shekhar and Sławomir Mielcarek and Y Otani and Bivas Rana and Aleksandra Trzaskowska}, url = {https://www.nature.com/articles/s41598-024-71110-1}, doi = {10.1038/s41598-024-71110-1}, issn = {2045-2322}, year = {2024}, date = {2024-08-31}, urldate = {2024-09-12}, journal = {Scientific Reports}, volume = {14}, number = {1}, pages = {20259}, abstract = {We investigated the thermally induced surface acoustic waves in CoFeB/MgO heterostructures with different underlayer materials. Our results show a direct correlation between the density and elastic parameters of the underlayer materials and the surface phonon dispersion. Using finite element method-based simulations, we calculate the effective elastic parameters (such as elastic tensor, Young’s modulus, and Poisson’s ratio) for multilayers with different underlayer materials. The simulation results, either considering the elastic parameters of individual layers or considering the effective elastic parameters of whole stacks, exhibit good agreement with the experimental data. This study will help us deepen our understanding of phonon properties and their interactions with other quasiparticles or magnetic textures with the help of these estimated elastic properties.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We investigated the thermally induced surface acoustic waves in CoFeB/MgO heterostructures with different underlayer materials. Our results show a direct correlation between the density and elastic parameters of the underlayer materials and the surface phonon dispersion. Using finite element method-based simulations, we calculate the effective elastic parameters (such as elastic tensor, Young’s modulus, and Poisson’s ratio) for multilayers with different underlayer materials. The simulation results, either considering the elastic parameters of individual layers or considering the effective elastic parameters of whole stacks, exhibit good agreement with the experimental data. This study will help us deepen our understanding of phonon properties and their interactions with other quasiparticles or magnetic textures with the help of these estimated elastic properties. |
| 103. | Riya Mehta, Bivas Rana, Susmita Saha Magnetization dynamics in quasiperiodic magnonic crystals Journal of Physics: Condensed Matter, 36 (44), pp. 443003, 2024. @article{Mehta_2024, title = {Magnetization dynamics in quasiperiodic magnonic crystals}, author = {Riya Mehta and Bivas Rana and Susmita Saha}, url = {https://dx.doi.org/10.1088/1361-648X/ad5ee8}, doi = {10.1088/1361-648X/ad5ee8}, year = {2024}, date = {2024-08-01}, journal = {Journal of Physics: Condensed Matter}, volume = {36}, number = {44}, pages = {443003}, publisher = {IOP Publishing}, abstract = {Quasiperiodic magnonic crystals, in contrast to their periodic counterparts, lack strict periodicity which gives rise to complex and localised spin wave spectra characterized by numerous band gaps and fractal features. Despite their intrinsic structural complexity, quasiperiodic nature of these magnonic crystals enables better tunability of spin wave spectra over their periodic counterparts and therefore holds promise for the applications in reprogrammable magnonic devices. In this article, we provide an overview of magnetization reversal and precessional magnetization dynamics studied so far in various quasiperiodic magnonic crystals, illustrating how their quasiperiodic nature gives rise to tailored band structure, enabling unparalleled control over spin waves. The review is concluded by highlighting the possible potential applications of these quasiperiodic magnonic crystals, exploring potential avenues for future exploration followed by a brief summary.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Quasiperiodic magnonic crystals, in contrast to their periodic counterparts, lack strict periodicity which gives rise to complex and localised spin wave spectra characterized by numerous band gaps and fractal features. Despite their intrinsic structural complexity, quasiperiodic nature of these magnonic crystals enables better tunability of spin wave spectra over their periodic counterparts and therefore holds promise for the applications in reprogrammable magnonic devices. In this article, we provide an overview of magnetization reversal and precessional magnetization dynamics studied so far in various quasiperiodic magnonic crystals, illustrating how their quasiperiodic nature gives rise to tailored band structure, enabling unparalleled control over spin waves. The review is concluded by highlighting the possible potential applications of these quasiperiodic magnonic crystals, exploring potential avenues for future exploration followed by a brief summary. |
| 102. | Aleksey Girich, Liubov Ivzhenko, Ganna Kharchenko, Sergey Polevoy, Sergey Tarapov, Maciej Krawczyk, Jarosław W. Kłos Existence of edge modes in periodic microstrip transmission line Scientific Reports, 14 (1), pp. 16477, 2024, ISSN: 2045-2322. @article{girich_existence_2024, title = {Existence of edge modes in periodic microstrip transmission line}, author = {Aleksey Girich and Liubov Ivzhenko and Ganna Kharchenko and Sergey Polevoy and Sergey Tarapov and Maciej Krawczyk and Jarosław W. Kłos}, url = {https://www.nature.com/articles/s41598-024-67610-9}, doi = {10.1038/s41598-024-67610-9}, issn = {2045-2322}, year = {2024}, date = {2024-07-16}, urldate = {2024-07-17}, journal = {Scientific Reports}, volume = {14}, number = {1}, pages = {16477}, abstract = {The microstrip of modulated width is a realization of a one-dimensional photonic crystal operating in the microwave regime. Like any photonic crystal, the periodic microstrip is characterised by the presence of frequency bands and band gaps that enable and prohibit wave propagation, respectively. The frequency bands for microstrip of the symmetric unit cell can be distinguished by 0 or pi Zak phase. The sum of these topological parameters for all bands below a given frequency gap determines the value of the surface impedance at the end of the microstrip. We demonstrate that edge modes are absent in a finite microstrip terminated at both ends in the centres of unit cells, but they can be induced by adding the defected cells. Edge modes present at both ends of the microstrip enable microwave tunneling with high transitivity in the frequency gap with or without a change in phase. This has been demonstrated experimentally and developed in detail using numerical simulations and model calculations. The investigated system, with a doublet of edge modes in the frequency gap, can be considered as a narrow passband filter of high selectivity and characterised by a significant group delay.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The microstrip of modulated width is a realization of a one-dimensional photonic crystal operating in the microwave regime. Like any photonic crystal, the periodic microstrip is characterised by the presence of frequency bands and band gaps that enable and prohibit wave propagation, respectively. The frequency bands for microstrip of the symmetric unit cell can be distinguished by 0 or pi Zak phase. The sum of these topological parameters for all bands below a given frequency gap determines the value of the surface impedance at the end of the microstrip. We demonstrate that edge modes are absent in a finite microstrip terminated at both ends in the centres of unit cells, but they can be induced by adding the defected cells. Edge modes present at both ends of the microstrip enable microwave tunneling with high transitivity in the frequency gap with or without a change in phase. This has been demonstrated experimentally and developed in detail using numerical simulations and model calculations. The investigated system, with a doublet of edge modes in the frequency gap, can be considered as a narrow passband filter of high selectivity and characterised by a significant group delay. |
| 101. | Miłosz Zdunek, Shashank Shekhar, Sławomir Mielcarek, Aleksandra Trzaskowska Investigation of phonons and magnons in [Ni80Fe20/Au/Co/Au]N multilayers Journal of Physics: Condensed Matter, 36 (37), pp. 375801, 2024. @article{Zdunek_2024, title = {Investigation of phonons and magnons in [Ni80Fe20/Au/Co/Au]N multilayers}, author = {Miłosz Zdunek and Shashank Shekhar and Sławomir Mielcarek and Aleksandra Trzaskowska}, url = {https://dx.doi.org/10.1088/1361-648X/ad5486}, doi = {10.1088/1361-648X/ad5486}, year = {2024}, date = {2024-06-18}, journal = {Journal of Physics: Condensed Matter}, volume = {36}, number = {37}, pages = {375801}, publisher = {IOP Publishing}, abstract = {The interaction between phonons and magnons is a rapidly developing area of research, particularly in the field of acoustic spintronics. To discuss this interaction, it is necessary to observe two different waves (acoustic and spin waves) with the same frequency and wavelength. In the Ni80Fe20/Au/Co/Au system deposited on a silicon substrate, we observe the interaction between spin waves and surface acoustic waves using Brillouin light scattering spectroscopy. As a result, we can selectively control (activate or deactivate) the magnetoelastic interaction between the fundamental spin wave mode and surface acoustic waves. This is achieved by adjusting the magnetostrictive layer thickness in the multilayer. We demonstrate that by adjusting the number of layers in a multilayer structure, it is possible to precisely control the dispersion of surface acoustic waves while having minimal impact on the fundamental spin wave mode.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The interaction between phonons and magnons is a rapidly developing area of research, particularly in the field of acoustic spintronics. To discuss this interaction, it is necessary to observe two different waves (acoustic and spin waves) with the same frequency and wavelength. In the Ni80Fe20/Au/Co/Au system deposited on a silicon substrate, we observe the interaction between spin waves and surface acoustic waves using Brillouin light scattering spectroscopy. As a result, we can selectively control (activate or deactivate) the magnetoelastic interaction between the fundamental spin wave mode and surface acoustic waves. This is achieved by adjusting the magnetostrictive layer thickness in the multilayer. We demonstrate that by adjusting the number of layers in a multilayer structure, it is possible to precisely control the dispersion of surface acoustic waves while having minimal impact on the fundamental spin wave mode. |
| 100. | Benedetta Flebus, Dirk Grundler, Bivas Rana, YoshiChika Otani, Igor Barsukov, Anjan Barman, Gianluca Gubbiotti, Pedro Landeros, Johan Akerman, Ursula Ebels, Philipp Pirro, Vladislav E Demidov, Katrin Schultheiss, Gyorgy Csaba, Qi Wang, Florin Ciubotaru, Dmitri E Nikonov, Ping Che, Riccardo Hertel, Teruo Ono, Dmytro Afanasiev, Johan Mentink, Theo Rasing, Burkard Hillebrands, Silvia Viola Kusminskiy, Wei Zhang, Chunhui Rita Du, Aurore Finco, Toeno van der Sar, Yunqiu Kelly Luo, Yoichi Shiota, Joseph Sklenar, Tao Yu, Jinwei Rao Journal of Physics: Condensed Matter, 36 (36), pp. 363501, 2024. @article{Flebus_2024, title = {The 2024 magnonics roadmap}, author = {Benedetta Flebus and Dirk Grundler and Bivas Rana and YoshiChika Otani and Igor Barsukov and Anjan Barman and Gianluca Gubbiotti and Pedro Landeros and Johan Akerman and Ursula Ebels and Philipp Pirro and Vladislav E Demidov and Katrin Schultheiss and Gyorgy Csaba and Qi Wang and Florin Ciubotaru and Dmitri E Nikonov and Ping Che and Riccardo Hertel and Teruo Ono and Dmytro Afanasiev and Johan Mentink and Theo Rasing and Burkard Hillebrands and Silvia Viola Kusminskiy and Wei Zhang and Chunhui Rita Du and Aurore Finco and Toeno van der Sar and Yunqiu Kelly Luo and Yoichi Shiota and Joseph Sklenar and Tao Yu and Jinwei Rao}, url = {`}, doi = {10.1088/1361-648X/ad399c}, year = {2024}, date = {2024-06-14}, journal = {Journal of Physics: Condensed Matter}, volume = {36}, number = {36}, pages = {363501}, publisher = {IOP Publishing}, abstract = {Magnonics is a research field that has gained an increasing interest in both the fundamental and applied sciences in recent years. This field aims to explore and functionalize collective spin excitations in magnetically ordered materials for modern information technologies, sensing applications and advanced computational schemes. Spin waves, also known as magnons, carry spin angular momenta that allow for the transmission, storage and processing of information without moving charges. In integrated circuits, magnons enable on-chip data processing at ultrahigh frequencies without the Joule heating, which currently limits clock frequencies in conventional data processors to a few GHz. Recent developments in the field indicate that functional magnonic building blocks for in-memory computation, neural networks and Ising machines are within reach. At the same time, the miniaturization of magnonic circuits advances continuously as the synergy of materials science, electrical engineering and nanotechnology allows for novel on-chip excitation and detection schemes. Such circuits can already enable magnon wavelengths of 50 nm at microwave frequencies in a 5G frequency band. Research into non-charge-based technologies is urgently needed in view of the rapid growth of machine learning and artificial intelligence applications, which consume substantial energy when implemented on conventional data processing units. In its first part, the 2024 Magnonics Roadmap provides an update on the recent developments and achievements in the field of nano-magnonics while defining its future avenues and challenges. In its second part, the Roadmap addresses the rapidly growing research endeavors on hybrid structures and magnonics-enabled quantum engineering. We anticipate that these directions will continue to attract researchers to the field and, in addition to showcasing intriguing science, will enable unprecedented functionalities that enhance the efficiency of alternative information technologies and computational schemes.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Magnonics is a research field that has gained an increasing interest in both the fundamental and applied sciences in recent years. This field aims to explore and functionalize collective spin excitations in magnetically ordered materials for modern information technologies, sensing applications and advanced computational schemes. Spin waves, also known as magnons, carry spin angular momenta that allow for the transmission, storage and processing of information without moving charges. In integrated circuits, magnons enable on-chip data processing at ultrahigh frequencies without the Joule heating, which currently limits clock frequencies in conventional data processors to a few GHz. Recent developments in the field indicate that functional magnonic building blocks for in-memory computation, neural networks and Ising machines are within reach. At the same time, the miniaturization of magnonic circuits advances continuously as the synergy of materials science, electrical engineering and nanotechnology allows for novel on-chip excitation and detection schemes. Such circuits can already enable magnon wavelengths of 50 nm at microwave frequencies in a 5G frequency band. Research into non-charge-based technologies is urgently needed in view of the rapid growth of machine learning and artificial intelligence applications, which consume substantial energy when implemented on conventional data processing units. In its first part, the 2024 Magnonics Roadmap provides an update on the recent developments and achievements in the field of nano-magnonics while defining its future avenues and challenges. In its second part, the Roadmap addresses the rapidly growing research endeavors on hybrid structures and magnonics-enabled quantum engineering. We anticipate that these directions will continue to attract researchers to the field and, in addition to showcasing intriguing science, will enable unprecedented functionalities that enhance the efficiency of alternative information technologies and computational schemes. |
| 99. | Mutlu Gokkavas, T. F. Gundogdu, Ekmel Ozbay, Andriy E. Serebryannikov Scientific Reports, 14 (1), pp. 13636, 2024, ISSN: 2045-2322. @article{gokkavas_few-layer_2024, title = {Few-layer bifunctional metasurfaces enabling asymmetric and symmetric polarization-plane rotation at the subwavelength scale}, author = {Mutlu Gokkavas and T. F. Gundogdu and Ekmel Ozbay and Andriy E. Serebryannikov}, url = {https://www.nature.com/articles/s41598-024-62073-4}, doi = {10.1038/s41598-024-62073-4}, issn = {2045-2322}, year = {2024}, date = {2024-06-13}, urldate = {2024-06-13}, journal = {Scientific Reports}, volume = {14}, number = {1}, pages = {13636}, abstract = {We introduce and numerically validate the concept of few-layer bifunctional metasurfaces comprising two arrays of quasiplanar subwavelength resonators and a middle grid (array of rectangular holes) that offer both symmetric and asymmetric transmissions connected, respectively, with symmetric and asymmetric polarization-plane rotation functionalities. The proposed structures are thinner than $$textbackslashlambda /7$$and free of diffractions. Usually, the structure’s symmetry or asymmetry, i.e. unbroken or broken spatial inversion symmetries, are considered for metasurfaces as prerequisites of the capability of symmetric or asymmetric conversion of linearly polarized waves, respectively. Due to the achieved adjustment of the resonances enabling the rotation of the polarization plane simultaneously for both orthogonal polarizations of the incident wave, the symmetric polarization-plane rotation functionality can be obtained within one subwavelength band, whereas the asymmetric polarization-plane rotation functionality associated with the asymmetric transmission is obtained within another subwavelength band. This combination of the functionalities in one subdiffraction structure is possible due to the optimal choice of the grid parameters, since they may strongly affect the coupling between the two resonator arrays. Although normal incidence is required for the targeted bifunctionality, the variations of the incidence angle can also be exploited for the enrichment of the overall functional capability. Variations of the polarization angle give another important degree of freedom. The connection between the polarization-angle dependence of cross-polarized transmission and capability of symmetric and asymmetric polarization-plane rotation functionalities is highlighted. The feasible designs of the bifunctional metasurfaces are discussed.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We introduce and numerically validate the concept of few-layer bifunctional metasurfaces comprising two arrays of quasiplanar subwavelength resonators and a middle grid (array of rectangular holes) that offer both symmetric and asymmetric transmissions connected, respectively, with symmetric and asymmetric polarization-plane rotation functionalities. The proposed structures are thinner than $$textbackslashlambda /7$$and free of diffractions. Usually, the structure’s symmetry or asymmetry, i.e. unbroken or broken spatial inversion symmetries, are considered for metasurfaces as prerequisites of the capability of symmetric or asymmetric conversion of linearly polarized waves, respectively. Due to the achieved adjustment of the resonances enabling the rotation of the polarization plane simultaneously for both orthogonal polarizations of the incident wave, the symmetric polarization-plane rotation functionality can be obtained within one subwavelength band, whereas the asymmetric polarization-plane rotation functionality associated with the asymmetric transmission is obtained within another subwavelength band. This combination of the functionalities in one subdiffraction structure is possible due to the optimal choice of the grid parameters, since they may strongly affect the coupling between the two resonator arrays. Although normal incidence is required for the targeted bifunctionality, the variations of the incidence angle can also be exploited for the enrichment of the overall functional capability. Variations of the polarization angle give another important degree of freedom. The connection between the polarization-angle dependence of cross-polarized transmission and capability of symmetric and asymmetric polarization-plane rotation functionalities is highlighted. The feasible designs of the bifunctional metasurfaces are discussed. |
| 98. | Yulia Kharlan, Krzysztof Sobucki, Krzysztof Szulc, Sara Memarzadeh, Jarosław W. Kłos Spin-wave confinement in a hybrid superconductor-ferrimagnet nanostructure Phys. Rev. Appl., 21 , pp. 064007, 2024. @article{PhysRevApplied.21.064007, title = {Spin-wave confinement in a hybrid superconductor-ferrimagnet nanostructure}, author = {Yulia Kharlan and Krzysztof Sobucki and Krzysztof Szulc and Sara Memarzadeh and Jarosław W. Kłos}, url = {https://link.aps.org/doi/10.1103/PhysRevApplied.21.064007}, doi = {10.1103/PhysRevApplied.21.064007}, year = {2024}, date = {2024-06-05}, journal = {Phys. Rev. Appl.}, volume = {21}, pages = {064007}, publisher = {American Physical Society}, abstract = {Eddy currents in a superconductor shield the magnetic field in its interior and are responsible for the formation of a magnetic stray field outside of the superconducting structure. The stray field can be controlled by the external magnetic field and affect the magnetization dynamics in the magnetic system placed in its range. In the case of a hybrid system consisting of a superconducting strip placed over a magnetic layer, we theoretically predict the confinement of spin waves in the well of the static stray field. The number of bound states and their frequencies can be controlled by an external magnetic field. We present the results of semianalytical calculations complemented by numerical modeling.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Eddy currents in a superconductor shield the magnetic field in its interior and are responsible for the formation of a magnetic stray field outside of the superconducting structure. The stray field can be controlled by the external magnetic field and affect the magnetization dynamics in the magnetic system placed in its range. In the case of a hybrid system consisting of a superconducting strip placed over a magnetic layer, we theoretically predict the confinement of spin waves in the well of the static stray field. The number of bound states and their frequencies can be controlled by an external magnetic field. We present the results of semianalytical calculations complemented by numerical modeling. |
| 97. | Weronika Andrzejewska, Paweł Wojciechowski, Mariya V Dobrotvorska, Szymon Murawka, Paweł Sobieszczyk, Mateusz Zelent, Mikołaj Lewandowski Directional growth of iron oxide nanowires on a vicinal copper surface Journal of Physics: Condensed Matter, 36 (34), pp. 345004, 2024. @article{Andrzejewska_2024, title = {Directional growth of iron oxide nanowires on a vicinal copper surface}, author = {Weronika Andrzejewska and Paweł Wojciechowski and Mariya V Dobrotvorska and Szymon Murawka and Paweł Sobieszczyk and Mateusz Zelent and Mikołaj Lewandowski}, url = {https://dx.doi.org/10.1088/1361-648X/ad3e58}, doi = {10.1088/1361-648X/ad3e58}, year = {2024}, date = {2024-05-30}, journal = {Journal of Physics: Condensed Matter}, volume = {36}, number = {34}, pages = {345004}, publisher = {IOP Publishing}, abstract = {Single-crystal magnetic nanostructures with well-defined shapes attract lots of interest due to their potential applications in magnetic and spintronic devices. However, development of methods allowing controlling their mutual crystallographic and geometric orientation constitutes a significant scientific challenge. One of the routes for obtaining such structures is to grow the materials epitaxially on naturally-structured supports, such as vicinal surfaces of single-crystal substrates. Iron oxides are among the most well-known magnetic materials which, depending on the phase, may exhibit ferro/ferri- or antiferromagnetic ordering. We have grown iron oxide nanowires on a Cu(410) single-crystal substrate faceted with molecular oxygen. Scanning tunneling microscopy and low energy electron diffraction revealed that the oxide grows in the [111] direction, along the step edges of the substrate and rotated by ±15° with respect to the [010] direction of copper atomic terraces (so that the the growing elongated structures are orientated parallel to each other). Notably, x-ray photoelectron spectroscopy confirmed that the nanowires represent the ferrimagnetic γ-Fe2O3 (maghemite) iron oxide phase, while micromagnetic simulations indicated that the wires are single-domain, with the easy magnetization axis orientated in-plane and along the long axis of the wire.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Single-crystal magnetic nanostructures with well-defined shapes attract lots of interest due to their potential applications in magnetic and spintronic devices. However, development of methods allowing controlling their mutual crystallographic and geometric orientation constitutes a significant scientific challenge. One of the routes for obtaining such structures is to grow the materials epitaxially on naturally-structured supports, such as vicinal surfaces of single-crystal substrates. Iron oxides are among the most well-known magnetic materials which, depending on the phase, may exhibit ferro/ferri- or antiferromagnetic ordering. We have grown iron oxide nanowires on a Cu(410) single-crystal substrate faceted with molecular oxygen. Scanning tunneling microscopy and low energy electron diffraction revealed that the oxide grows in the [111] direction, along the step edges of the substrate and rotated by ±15° with respect to the [010] direction of copper atomic terraces (so that the the growing elongated structures are orientated parallel to each other). Notably, x-ray photoelectron spectroscopy confirmed that the nanowires represent the ferrimagnetic γ-Fe2O3 (maghemite) iron oxide phase, while micromagnetic simulations indicated that the wires are single-domain, with the easy magnetization axis orientated in-plane and along the long axis of the wire. |
| 96. | Mathieu Moalic, Mateusz Zelent, Krzysztof Szulc, Maciej Krawczyk The role of non-uniform magnetization texture for magnon–magnon coupling in an antidot lattice Scientific Reports, 14 (1), pp. 11501, 2024, ISSN: 2045-2322. @article{moalic_role_2024, title = {The role of non-uniform magnetization texture for magnon–magnon coupling in an antidot lattice}, author = {Mathieu Moalic and Mateusz Zelent and Krzysztof Szulc and Maciej Krawczyk}, url = {https://www.nature.com/articles/s41598-024-61246-5}, doi = {10.1038/s41598-024-61246-5}, issn = {2045-2322}, year = {2024}, date = {2024-05-20}, urldate = {2024-05-23}, journal = {Scientific Reports}, volume = {14}, number = {1}, pages = {11501}, abstract = {We numerically study the spin-wave dynamics in an antidot lattice based on a Co/Pd multilayer structure with reduced perpendicular magnetic anisotropy at the edges of the antidots. This structure forms a magnonic crystal with a periodic antidot pattern and a periodic magnetization configuration consisting of out-of-plane magnetized bulk and in-plane magnetized rims. Our results show a different behavior of spin waves in the bulk and in the rims under varying out-of-plane external magnetic field strength, revealing complex spin-wave spectra and hybridizations between the modes of these two subsystems. A particularly strong magnon–magnon coupling, due to exchange interactions, is found between the fundamental bulk spin-wave mode and the second-order radial rim modes. However, the dynamical coupling between the spin-wave modes at low frequencies, involving the first-order radial rim modes, is masked by the changes in the static magnetization at the bulk–rim interface with magnetic field changes. The study expands the horizons of magnonic-crystal research by combining periodic structural patterning and non-collinear magnetization texture to achieve strong magnon–magnon coupling, highlighting the significant role of exchange interactions in the hybridization.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We numerically study the spin-wave dynamics in an antidot lattice based on a Co/Pd multilayer structure with reduced perpendicular magnetic anisotropy at the edges of the antidots. This structure forms a magnonic crystal with a periodic antidot pattern and a periodic magnetization configuration consisting of out-of-plane magnetized bulk and in-plane magnetized rims. Our results show a different behavior of spin waves in the bulk and in the rims under varying out-of-plane external magnetic field strength, revealing complex spin-wave spectra and hybridizations between the modes of these two subsystems. A particularly strong magnon–magnon coupling, due to exchange interactions, is found between the fundamental bulk spin-wave mode and the second-order radial rim modes. However, the dynamical coupling between the spin-wave modes at low frequencies, involving the first-order radial rim modes, is masked by the changes in the static magnetization at the bulk–rim interface with magnetic field changes. The study expands the horizons of magnonic-crystal research by combining periodic structural patterning and non-collinear magnetization texture to achieve strong magnon–magnon coupling, highlighting the significant role of exchange interactions in the hybridization. |
| 95. | Uladzislau Makartsou, Mateusz Gołębiewski, Urszula Guzowska, Alexander Stognij, Ryszard Gieniusz, Maciej Krawczyk Applied Physics Letters, 124 (19), pp. 192406, 2024, ISSN: 0003-6951. @article{10.1063/5.0195099, title = {Spin-wave self-imaging: Experimental and numerical demonstration of caustic and Talbot-like diffraction patterns}, author = {Uladzislau Makartsou and Mateusz Gołębiewski and Urszula Guzowska and Alexander Stognij and Ryszard Gieniusz and Maciej Krawczyk}, url = {https://doi.org/10.1063/5.0195099}, doi = {10.1063/5.0195099}, issn = {0003-6951}, year = {2024}, date = {2024-05-09}, journal = {Applied Physics Letters}, volume = {124}, number = {19}, pages = {192406}, abstract = {Extending the scope of the self-imaging phenomenon, traditionally associated with linear optics, to the domain of magnonics, this study presents the experimental demonstration and numerical analysis of spin-wave (SW) self-imaging in an in-plane magnetized yttrium iron garnet film. We explore this phenomenon using a setup in which a plane SW passes through a diffraction grating, and the resulting interference pattern is detected using Brillouin light scattering. We have varied the frequencies of the source dynamic magnetic field to discern the influence of the anisotropic dispersion relation and the caustic effect on the analyzed phenomenon. We found that at low frequencies and diffraction fields, the caustics determine the interference pattern. However, at large distances from the grating, when the waves of high diffraction order and number of slits contribute to the interference pattern, the self-imaging phenomenon and Talbot-like patterns are formed. This methodological approach not only sheds light on the behavior of SW interference under different conditions but also enhances our understanding of the SW self-imaging process in both isotropic and anisotropic media.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Extending the scope of the self-imaging phenomenon, traditionally associated with linear optics, to the domain of magnonics, this study presents the experimental demonstration and numerical analysis of spin-wave (SW) self-imaging in an in-plane magnetized yttrium iron garnet film. We explore this phenomenon using a setup in which a plane SW passes through a diffraction grating, and the resulting interference pattern is detected using Brillouin light scattering. We have varied the frequencies of the source dynamic magnetic field to discern the influence of the anisotropic dispersion relation and the caustic effect on the analyzed phenomenon. We found that at low frequencies and diffraction fields, the caustics determine the interference pattern. However, at large distances from the grating, when the waves of high diffraction order and number of slits contribute to the interference pattern, the self-imaging phenomenon and Talbot-like patterns are formed. This methodological approach not only sheds light on the behavior of SW interference under different conditions but also enhances our understanding of the SW self-imaging process in both isotropic and anisotropic media. |
| 94. | Mateusz Gołębiewski, Riccardo Hertel, Massimiliano dÁquino, Vitaliy Vasyuchka, Mathias Weiler, Philipp Pirro, Maciej Krawczyk, Shunsuke Fukami, Hideo Ohno, Justin Llandro Collective Spin-Wave Dynamics in Gyroid Ferromagnetic Nanostructures ACS Applied Materials & Interfaces, 2024, ISSN: 1944-8244. @article{Gołębiewski2024, title = {Collective Spin-Wave Dynamics in Gyroid Ferromagnetic Nanostructures}, author = {Mateusz Gołębiewski and Riccardo Hertel and Massimiliano dÁquino and Vitaliy Vasyuchka and Mathias Weiler and Philipp Pirro and Maciej Krawczyk and Shunsuke Fukami and Hideo Ohno and Justin Llandro}, url = {https://doi.org/10.1021/acsami.4c02366}, doi = {10.1021/acsami.4c02366}, issn = {1944-8244}, year = {2024}, date = {2024-04-22}, journal = {ACS Applied Materials & Interfaces}, publisher = {American Chemical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
| 93. | Nikhil Kumar, Paweł Gruszecki, Mateusz Gołębiewski, Jarosław W. Kłos, Maciej Krawczyk Exciting High-Frequency Short-Wavelength Spin Waves using High Harmonics of a Magnonic Cavity Mode Advanced Quantum Technologies, n/a (n/a), pp. 2400015, 2024. @article{https://doi.org/10.1002/qute.202400015, title = {Exciting High-Frequency Short-Wavelength Spin Waves using High Harmonics of a Magnonic Cavity Mode}, author = {Nikhil Kumar and Paweł Gruszecki and Mateusz Gołębiewski and Jarosław W. Kłos and Maciej Krawczyk}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/qute.202400015}, doi = {https://doi.org/10.1002/qute.202400015}, year = {2024}, date = {2024-03-29}, journal = {Advanced Quantum Technologies}, volume = {n/a}, number = {n/a}, pages = {2400015}, abstract = {Abstract Spin waves (SWs) are promising objects for signal processing and future quantum technologies due to their high microwave frequencies with corresponding nanoscale wavelengths. However, the nano-wavelength SWs generated so far are limited to low frequencies. In the paper, using micromagnetic simulations, it is shown that a microwave-pumped SW mode confined to the cavity of a thin film magnonic crystal (MC) can be used to generate waves at tens of GHz and wavelengths well below 50 nm. These multi-frequency harmonics of the fundamental cavity mode are generated when the amplitude of the pumping microwave field exceeds a threshold, and their intensities then scale linearly with the field intensity. The frequency of the cavity mode is equal to the ferromagnetic resonance frequency of the planar ferromagnetic film, which overlaps with the magnonic bandgap, providing an efficient mechanism for confinement and magnetic field tunability. The effect reaches saturation when the microstrip feed line covers the entire cavity, making the system feasible for realization.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Abstract Spin waves (SWs) are promising objects for signal processing and future quantum technologies due to their high microwave frequencies with corresponding nanoscale wavelengths. However, the nano-wavelength SWs generated so far are limited to low frequencies. In the paper, using micromagnetic simulations, it is shown that a microwave-pumped SW mode confined to the cavity of a thin film magnonic crystal (MC) can be used to generate waves at tens of GHz and wavelengths well below 50 nm. These multi-frequency harmonics of the fundamental cavity mode are generated when the amplitude of the pumping microwave field exceeds a threshold, and their intensities then scale linearly with the field intensity. The frequency of the cavity mode is equal to the ferromagnetic resonance frequency of the planar ferromagnetic film, which overlaps with the magnonic bandgap, providing an efficient mechanism for confinement and magnetic field tunability. The effect reaches saturation when the microstrip feed line covers the entire cavity, making the system feasible for realization. |
| 92. | Andriy E. Serebryannikov, Akhlesh Lakhtakia, Ekmel Ozbay Opt. Mater. Express, 14 (3), pp. 745–758, 2024. @article{Serebryannikov:24, title = {Thermally mediated transmission-mode deflection of terahertz waves by lamellar metagratings containing a phase-change material}, author = {Andriy E. Serebryannikov and Akhlesh Lakhtakia and Ekmel Ozbay}, url = {https://opg.optica.org/ome/abstract.cfm?URI=ome-14-3-745}, doi = {10.1364/OME.511804}, year = {2024}, date = {2024-03-01}, journal = {Opt. Mater. Express}, volume = {14}, number = {3}, pages = {745--758}, publisher = {Optica Publishing Group}, abstract = {The planewave-response characteristics of simple lamellar metagratings exhibiting thermally mediated transmission-mode deflection (blazing) were numerically investigated, the unit cell of each metagrating containing a phase-change material chosen to be indium antimonide (InSb). Thermal control arises from the use of InSb in its insulator phase and the vicinity of the vacuum state. Metagratings of type A comprise parallel rods of InSb on silicon-dioxide substrate, whereas the substrate is also made of InSb in metagratings of type B. Both types exhibit thermally controllable deflection and asymmetric transmission, which occur when the real part of the relative permittivity of InSb is high. Narrowband features in the sub-diffraction regime may appear in a wide frequency range which involves the vicinity of the vacuum state, the real part of the relative permittivity of InSb being low then.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The planewave-response characteristics of simple lamellar metagratings exhibiting thermally mediated transmission-mode deflection (blazing) were numerically investigated, the unit cell of each metagrating containing a phase-change material chosen to be indium antimonide (InSb). Thermal control arises from the use of InSb in its insulator phase and the vicinity of the vacuum state. Metagratings of type A comprise parallel rods of InSb on silicon-dioxide substrate, whereas the substrate is also made of InSb in metagratings of type B. Both types exhibit thermally controllable deflection and asymmetric transmission, which occur when the real part of the relative permittivity of InSb is high. Narrowband features in the sub-diffraction regime may appear in a wide frequency range which involves the vicinity of the vacuum state, the real part of the relative permittivity of InSb being low then. |
| 91. | Krzysztof Szulc, Yulia Kharlan, Pavlo Bondarenko, Elena V. Tartakovskaya, Maciej Krawczyk Impact of surface anisotropy on the spin-wave dynamics in a thin ferromagnetic film Phys. Rev. B, 109 , pp. 054430, 2024. @article{PhysRevB.109.054430, title = {Impact of surface anisotropy on the spin-wave dynamics in a thin ferromagnetic film}, author = {Krzysztof Szulc and Yulia Kharlan and Pavlo Bondarenko and Elena V. Tartakovskaya and Maciej Krawczyk}, url = {https://link.aps.org/doi/10.1103/PhysRevB.109.054430}, doi = {10.1103/PhysRevB.109.054430}, year = {2024}, date = {2024-02-01}, journal = {Phys. Rev. B}, volume = {109}, pages = {054430}, publisher = {American Physical Society}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
| 90. | Andriy E. Serebryannikov, Ekmel Ozbay Scientific Reports, 14 (1), pp. 1580, 2024, ISSN: 2045-2322. @article{Serebryannikov2024, title = {Exploring localized ENZ resonances and their role in superscattering, wideband invisibility, and tunable scattering}, author = {Andriy E. Serebryannikov and Ekmel Ozbay}, url = {https://doi.org/10.1038/s41598-024-51503-y}, doi = {10.1038/s41598-024-51503-y}, issn = {2045-2322}, year = {2024}, date = {2024-01-18}, journal = {Scientific Reports}, volume = {14}, number = {1}, pages = {1580}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
| 89. | Sreedevi Janardhanan, Sławomir Mielcarek, Hubert Głowiński, Daniel Kiphart, Piotr Kuświk, Aleksandra Trzaskowska Spin wave dynamics in CoFeB bilayers with wedged Au spacer Journal of Magnetism and Magnetic Materials, 589 , pp. 171570, 2024, ISSN: 0304-8853. @article{JANARDHANAN2024171570, title = {Spin wave dynamics in CoFeB bilayers with wedged Au spacer}, author = {Sreedevi Janardhanan and Sławomir Mielcarek and Hubert Głowiński and Daniel Kiphart and Piotr Kuświk and Aleksandra Trzaskowska}, url = {https://www.sciencedirect.com/science/article/pii/S0304885323012209}, doi = {https://doi.org/10.1016/j.jmmm.2023.171570}, issn = {0304-8853}, year = {2024}, date = {2024-01-01}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {589}, pages = {171570}, abstract = {This paper presents the experimental studies of ferromagnetic layers separated by a heavy metal wedge. The studied system consists of two thin layers of CoFeB separated by a wedged Au spacer. By performing Brillouin light scattering measurements of the spin-wave dispersion relations, and dependences on the magnetic field, we extract magnetic parameters in the studied ferromagnetic layers as a function of heavy metal thickness. We concluded that for thin ferromagnetic double layers, the magnetic properties strongly depend on the thickness of the wedge gold layer spacer. In particular, the presence of perpendicular magnetic anisotropy diminishes as the thickness of the magnetic material is increased, and at the spacers thicker than 2.5 nm the dynamic coupling between propagating spin waves in both layers is negligible. These findings have potential advantages for the development of future spintronic devices.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper presents the experimental studies of ferromagnetic layers separated by a heavy metal wedge. The studied system consists of two thin layers of CoFeB separated by a wedged Au spacer. By performing Brillouin light scattering measurements of the spin-wave dispersion relations, and dependences on the magnetic field, we extract magnetic parameters in the studied ferromagnetic layers as a function of heavy metal thickness. We concluded that for thin ferromagnetic double layers, the magnetic properties strongly depend on the thickness of the wedge gold layer spacer. In particular, the presence of perpendicular magnetic anisotropy diminishes as the thickness of the magnetic material is increased, and at the spacers thicker than 2.5 nm the dynamic coupling between propagating spin waves in both layers is negligible. These findings have potential advantages for the development of future spintronic devices. |