@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}
}

@article{Kharlan2024,
title = {Tunable magnonic crystal in a hybrid superconductor-ferrimagnet nanostructure},
author = {Julia 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}
}

@article{PhysRevApplied.21.064007,
title = {Spin-wave confinement in a hybrid superconductor-ferrimagnet nanostructure},
author = {Julia 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}
}

@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}
}

@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}
}

@article{ma16227110,
title = {Modeling of Charge Injection, Recombination, and Diffusion in Complete Perovskite Solar Cells on Short Time Scales},
author = {Krzysztof Szulc and Katarzyna Pydzińska-Białek and Marcin Ziółek},
url = {https://www.mdpi.com/1996-1944/16/22/7110},
doi = {10.3390/ma16227110},
issn = {1996-1944},
year = {2023},
date = {2023-11-10},
journal = {Materials},
volume = {16},
number = {22},
abstract = {A model of charge population decay upon ultrafast optical pulse excitation in complete, working perovskite solar cells is proposed. The equation, including charge injections (extractions) from perovskite to contact materials, charge diffusion, and charge recombination via first-, second-, and third-order processes, is solved using numerical simulations. Results of simulations are positively verified by broadband transient absorption results of mixed halide, triple-cation perovskite (FA0.76MA0.19Cs0.05Pb(I0.81Br0.19)3). The combined analytical and experimental findings reveal the best approaches for the proper determination of the crucial parameters that govern charge transfer dynamics in perovskite solar cells on picosecond and single nanosecond time scales. Measurements from both electron and hole transporting layer sides under different applied bias potentials (zero and close to open circuit potential) and different pump fluence (especially below 5 μJ/cm2), followed by fitting of parameters using numerical modeling, are proposed as the optimal methodology for describing the processes taking place in efficient devices.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{doi:10.1021/acsnano.2c04256,
title = {Reconfigurable Magnonic Crystals Based on Imprinted Magnetization Textures in Hard and Soft Dipolar-Coupled Bilayers},
author = {Krzysztof Szulc and Silvia Tacchi and Aurelio Hierro-Rodríguez and Javier Díaz and Paweł Gruszecki and Piotr Graczyk and Carlos Quirós and Daniel Markó and José Ignacio Martín and María Vélez and David S Schmool and Giovanni Carlotti and Maciej Krawczyk and Luis Manuel Álvarez-Prado},
url = {https://doi.org/10.1021/acsnano.2c04256},
doi = {10.1021/acsnano.2c04256},
year = {2022},
date = {2022-08-31},
journal = {ACS Nano},
volume = {0},
number = {0},
pages = {0},
abstract = {Reconfigurable magnetization textures offer control of spin waves with promising properties for future low-power beyond-CMOS systems. However, materials with perpendicular magnetic anisotropy (PMA) suitable for stable magnetization-texture formation are characterized by high damping, which limits their applicability in magnonic devices. Here, we propose to overcome this limitation by using hybrid structures, i.e., a PMA layer magnetostatically coupled to a low-damping soft ferromagnetic film. We experimentally show that a periodic stripe-domain texture from a PMA layer is imprinted upon the soft layer and induces a nonreciprocal dispersion relation of the spin waves confined to the low-damping film. Moreover, an asymmetric bandgap features the spin-wave band diagram, which is a clear demonstration of collective spin-wave dynamics, a property characteristic for magnonic crystals with broken time-reversal symmetry. The composite character of the hybrid structure allows for stabilization of two magnetic states at remanence, with parallel and antiparallel orientation of net magnetization in hard and soft layers. The states can be switched using a low external magnetic field; therefore, the proposed system obtains an additional functionality of state reconfigurability. This study offers a link between reconfigurable magnetization textures and low-damping spin-wave dynamics, providing an opportunity to create miniaturized, programmable, and energy-efficient signal processing devices operating at high frequencies.},
note = {PMID: 36043881},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{9706176,
title = {Advances in Magnetics Roadmap on Spin-Wave Computing},
author = {A V Chumak and P Kabos and M Wu and C Abert and C Adelmann and A O Adeyeye and J Akerman and F G Aliev and A Anane and A Awad and C H Back and A Barman and G E W Bauer and M Becherer and E N Beginin and V A S V Bittencourt and Y M Blanter and P Bortolotti and I Boventer and D A Bozhko and S A Bunyaev and J J Carmiggelt and R R Cheenikundil and F Ciubotaru and S Cotofana and G Csaba and O V Dobrovolskiy and C Dubs and M Elyasi and K G Fripp and H Fulara and I A Golovchanskiy and C Gonzalez-Ballestero and Piotr Graczyk and D Grundler and Paweł Gruszecki and G Gubbiotti and K Guslienko and A Haldar and S Hamdioui and R Hertel and B Hillebrands and T Hioki and A Houshang and C -M Hu and H Huebl and M Huth and E Iacocca and M B Jungfleisch and G N Kakazei and A Khitun and R Khymyn and T Kikkawa and M Kloui and O Klein and Jarosław W. Kłos and S Knauer and S Koraltan and M Kostylev and Maciej Krawczyk and I N Krivorotov and V V Kruglyak and D Lachance-Quirion and S Ladak and R Lebrun and Y Li and M Lindner and R Macedo and S Mayr and G A Melkov and Szymon Mieszczak and Y Nakamura and H T Nembach and A A Nikitin and S A Nikitov and V Novosad and J A Otalora and Y Otani and A Papp and B Pigeau and P Pirro and W Porod and F Porrati and H Qin and Bivas Rana and T Reimann and F Riente and O Romero-Isart and A Ross and A V Sadovnikov and A R Safin and E Saitoh and G Schmidt and H Schultheiss and K Schultheiss and A A Serga and S Sharma and J M Shaw and D Suess and O Surzhenko and Krzysztof Szulc and T Taniguchi and M Urbanek and K Usami and A B Ustinov and T van der Sar and S van Dijken and V I Vasyuchka and R Verba and Viola S Kusminskiy and Q Wang and M Weides and M Weiler and S Wintz and S P Wolski and X Zhang},
doi = {10.1109/TMAG.2022.3149664},
issn = {1941-0069},
year = {2022},
date = {2022-02-07},
journal = {IEEE Trans. Magn.},
volume = {58},
number = {6},
pages = {1-72},
abstract = {Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in the GHz-to-THz frequency range, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS are just a few of many advantages offered by magnons. Although magnonics is still primarily positioned in the academic domain, the scientific and technological challenges of the field are being extensively investigated, and many proof-of-concept prototypes have already been realized in laboratories. This roadmap is a product of the collective work of many authors, which covers versatile spin-wave computing approaches, conceptual building blocks, and underlying physical phenomena. In particular, the roadmap discusses the computation operations with the Boolean digital data, unconventional approaches, such as neuromorphic computing, and the progress toward magnon-based quantum computing. This article is organized as a collection of sub-sections grouped into seven large thematic sections. Each sub-section is prepared by one or a group of authors and concludes with a brief description of current challenges and the outlook of further development for each research direction.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{PhysRevApplied.16.054033,
title = {Spin-Wave Dispersion Measurement by Variable-Gap Propagating Spin-Wave Spectroscopy},
author = {Marek Vanatka and Krzysztof Szulc and Ondrej Wojewoda and Carsten Dubs and Andrii V Chumak and Maciej Krawczyk and Oleksandr V Dobrovolskiy and Jarosław W. Kłos and Michal Urbánek},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.16.054033},
doi = {10.1103/PhysRevApplied.16.054033},
year = {2021},
date = {2021-11-17},
journal = {Phys. Rev. Applied},
volume = {16},
pages = {054033},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{doi:10.1063/5.0046001b,
title = {Multifunctional operation of the double-layer ferromagnetic structure coupled by a rectangular nanoresonator},
author = {Pierre Roberjot and Krzysztof Szulc and Jarosław W. Kłos and Maciej Krawczyk},
url = {https://doi.org/10.1063/5.0046001},
doi = {10.1063/5.0046001},
year = {2021},
date = {2021-05-05},
journal = {Appl. Phys. Lett.},
volume = {118},
number = {18},
pages = {182406},
abstract = {The use of spin waves as a signal carrier requires developing the functional elements allowing for multiplexing and demultiplexing information coded at different wavelengths. For this purpose, we propose a system of thin ferromagnetic layers dynamically coupled by a rectangular ferromagnetic resonator. We show that single and double, clockwise and counterclockwise, circulating modes of the resonator offer a wide possibility of control of propagating waves. Particularly, at frequency related to the double-clockwise circulating spin-wave mode of the resonator, the spin wave excited in one layer is transferred to the second one where it propagates in the backward direction. Interestingly, the wave excited in the second layer propagates in the forward direction only in that layer. This demonstrates add-drop filtering and circulator functionality. Thus, the proposed system can become an important part of future magnonic technology for signal routing.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{PhysRevB.103.134404,
title = {Nonreciprocal spin-wave dynamics in Pt/Co/W/Co/Pt multilayers},
author = {Krzysztof Szulc and Simon Mendisch and Michał Mruczkiewicz and Francesca Casoli and Markus Becherer and Gianluca Gubbiotti},
url = {https://link.aps.org/doi/10.1103/PhysRevB.103.134404},
doi = {10.1103/PhysRevB.103.134404},
year = {2021},
date = {2021-04-01},
journal = {Phys. Rev. B},
volume = {103},
pages = {134404},
publisher = {American Physical Society},
abstract = {We present a detailed study of the spin-wave dynamics in single Pt/Co/W and double Pt/Co/W/Co/Pt ferromagnetic layer systems. The dispersion of spin waves was measured by wave-vector-resolved Brillouin light scattering spectroscopy while the in-plane and out-of-plane magnetization curves were measured by alternating gradient field magnetometry. The interfacial Dzyaloshinskii-Moriya interaction induced nonreciprocal dispersion relation was demonstrated for both single and double ferromagnetic layers and explicated by numerical simulations and theoretical formulas. The results indicate the crucial role of the order of layers deposition on the magnetic parameters. A significant difference between the perpendicular magnetic anisotropy constant in double ferromagnetic layer systems conduces to the decline of the interlayer interactions and different dispersion relations for the spin-wave modes. Our study provides a significant contribution to the realization of the multifunctional nonreciprocal magnonic devices based on ultrathin ferromagnetic/heavy-metal layer systems.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}