Magnons and phonons in periodic nanostructures – NCN grant
Tile of the project
Modification of the interactions between magnons and phonons in periodic nanostructures by adjusting the structural and material parameters
Call, grant No
OPUS11, National Science Center – Poland, UMO-2016/21/B/ST3/00452
Start date, end date
March 6, 2017 — March 5, 2021
Budget
999 980,00 PLN
In the Au/CoFeB multilayer deposited on a Si substrate, the thermally excited Love surface acoustic wave (transversal displacements of the cubes) and the spin wave (red cones) interact with each other. The interaction can be detected in phonon and magnon dispersion relation, measured by optical means, using Brillouin light scattering spectrometry.
Abstract
Research project objective/Research hypothesis
The project is focused on the interactions between magnons and phonons in nanostructures. We are going to consider the system in which the existence both spin waves and elastic waves is possible. The main goal of this Project is modification of the interaction between magnons and phonons by adjusting the structural and material parameters of periodic nanostructures.
The investigated periodic structures will be designed to alter (to enhance or to weaken) the dynamical magneto-elastic interactions by deliberate introduction of structural and material changes or by adjustment of the external magnetic field. We plan to study the systems composed of elastic slab loaded by periodic array of elements deposited on its surface. The elements (stripes or dots) can be deposited directly on the dielectric substrate or on the thin metallic (ferromagnetic) underlayer. The deposited elements can be both magnetic and nonmagnetic.
The enhancement is possible when the magnonic and phononic bands coincides in frequency domain and ensured for the surface elastic waves (of Rayleigh and Sezawa type) localized in the area where the ferromagnetic elements (underlayer and stripes or dots) are located (i.e. on the surface). The elastic stress concentrated in ferromagnetic (magnetostrictive) subsystem induces the magneto-elastic coupling which can damp or amplify the spin waves dynamics at selected resonance frequencies (depending if the elastic wave is thermally activated or generated in the form of coherent acoustic wave).
Due to the periodicity of phononic (magnonic) subsystem the phononic (magnonic) dispersion will be folded. This allows to fulfill the resonance conditions for strong magneto-elastic coupling at a few frequencies corresponding to the multiple crossing of dispersion bands of phononic and magnonic systems. The magneto-elastic coupling can be also tuned in periodic nanostructures be adjusting the external magnetic field. The appropriately chosen magnetic field can the enhance (or reduce) the overlapping of magonic and phononic bands by shifting of the magnonic spectrum in frequency domain. This leads to the increase (or decrease) of the strength of magneto-elastic interactions.
For selected systems in which strong magneto-elastic coupling were observed, we are going to investigate (numerically and experimentally) the possibility of spin wave (elastic wave) amplification by the interaction with elastic wave (spin wave) generated by piezoelectric transducers (micro stripe antenna). The outcomes, we will obtain form this study, will allow us to verify the research hypothesis about the possibility of change of magneto-elastic coupling by periodic patterning of the system.
Research project methodology
The research plan encompasses both theoretical and experimental investigations covering the whole cycle of research: numerical simulation – fabrication – characterization – interpretation and theoretical analysis. The theoretical research will be focused on solution of equations describing dynamics of elastic waves (classical theory of elasticity) and spin waves (Landau-Lifshitz equation). The magneto-elastic interactions will be included into Landau-Lifshitz equation be adding the additional term to effective field describing the magnetic fields induced by elastic – determined by the solution of the equations of theory of elasticity. The calculations will be performed with the aid of finite element method, plane wave method and discrete dipole method. The samples will originate from own resources or will be acquired from collaborating groups (third partners) which use the following techniques: electron-beam lithography and focused ion beam epitaxy. The topology of sample will be investigated using: polarization microscopy and atomic force microscopy. The spin wave and elastic wave spectra will be measured with the aid of: Brillouin spectrometer and vector network analyzer.
Expected impact of the research project on the development of science, civilization and society
The magnonics, based on spin wave excitations magnetic material, is a promising branch of technology used for signal processing, and transmission. The one of the main obstacles in the development of this field is damping of spin waves. Nowadays a lots of efforts is concentrated on reduction or on controlling of damping. It is especially important for sophisticated magnonic systems (like magnonic crystals) where the group velocity of spin waves is usually reduced. To achieve long range of spin wave propagation, we have to take spatial care about its life time and amplification of waves in such systems. Our research are focused on these issues. We plan to use elastic waves to amplify spin waves in magnonic nanostructures.
Research tasks
Theoretical and experimental investigation of the dispersion relation in phononic structures for selection of the most suitable systems for studies of magneto-elastic coupling
Numerical simulations and measurements of spin wave dispersion relations in magnonic crystals
Developing of theoretical methods and computational techniques for investigations of frequency spectra of magnonic-phononic structures with magneto-elastic coupling included
Exploitation of the magneto-elastic coupling in artificial crystals: investigation of the spin-waves (elastic waves) pumping by forced elastic waves (spin waves)
Publications
2022
19.
Maciej Wiesner, Richard H Roberts, Ruijing Ge, Lukas Mennel, Thomas Mueller, Jung-Fu Lin, Deji Akinwande, Jacek Jenczyk
@article{WIESNER2022154078,
title = {Signatures of bright-to-dark exciton conversion in corrugated MoS2 monolayers},
author = {Maciej Wiesner and Richard H Roberts and Ruijing Ge and Lukas Mennel and Thomas Mueller and Jung-Fu Lin and Deji Akinwande and Jacek Jenczyk},
url = {https://www.sciencedirect.com/science/article/pii/S0169433222016154},
doi = {https://doi.org/10.1016/j.apsusc.2022.154078},
issn = {0169-4332},
year = {2022},
date = {2022-07-07},
journal = {Applied Surface Science},
volume = {600},
pages = {154078},
abstract = {In this study, we investigated the effect of periodic uniaxial strains on electron and phonon transports of polycrystalline and single-crystal molybdenum disulphide (MoS2) monolayers on a periodically corrugated sapphire surface. Analysis of micro-Raman, polarized photoluminescence and second harmonic generation results shows the anisotropy of the corrugation-induced strain in both single- and polycrystalline MoS2 monolayers. AFM topography measurements show periodically-rippled surfaces of the MoS2 in the nanometre scale. Our results show that the application of the periodic strain produces two major effects on the band structure of MoS2 monolayers: modulations on the band gap anisotropy and reduction of out-of-plane spin-relaxation time due to substrate-induced bending of MoS2. Spin memory loss, in other words, shortening the spin relaxation time, enables an electron spin-flip scattering process that can convert a formerly bright exciton to a dark exciton. Such conversion is reflected in decreasing intensity of photoluminescence and in the light intensity collected by scanning near-field microscope. Our results demonstrate the ability to control both the bandgap and exciton character in monolayer MoS2 via periodic strains imposed by corrugated sapphire substrates. This approach offers an effective means in designing novel electronic devices for photovoltaic applications. The bright-to-dark excitons conversion in photovoltaic devices can boast longer lifetimes than their bright exciton counterparts so they can be more efficiently collected by external electrodes. The strain-induced conversion of the bright-to-dark excitons makes the hybrid MoS2/corrugated sapphire structure an interesting platform for future photovoltaic applications.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this study, we investigated the effect of periodic uniaxial strains on electron and phonon transports of polycrystalline and single-crystal molybdenum disulphide (MoS2) monolayers on a periodically corrugated sapphire surface. Analysis of micro-Raman, polarized photoluminescence and second harmonic generation results shows the anisotropy of the corrugation-induced strain in both single- and polycrystalline MoS2 monolayers. AFM topography measurements show periodically-rippled surfaces of the MoS2 in the nanometre scale. Our results show that the application of the periodic strain produces two major effects on the band structure of MoS2 monolayers: modulations on the band gap anisotropy and reduction of out-of-plane spin-relaxation time due to substrate-induced bending of MoS2. Spin memory loss, in other words, shortening the spin relaxation time, enables an electron spin-flip scattering process that can convert a formerly bright exciton to a dark exciton. Such conversion is reflected in decreasing intensity of photoluminescence and in the light intensity collected by scanning near-field microscope. Our results demonstrate the ability to control both the bandgap and exciton character in monolayer MoS2 via periodic strains imposed by corrugated sapphire substrates. This approach offers an effective means in designing novel electronic devices for photovoltaic applications. The bright-to-dark excitons conversion in photovoltaic devices can boast longer lifetimes than their bright exciton counterparts so they can be more efficiently collected by external electrodes. The strain-induced conversion of the bright-to-dark excitons makes the hybrid MoS2/corrugated sapphire structure an interesting platform for future photovoltaic applications.
@article{TRZASKOWSKA2022169049,
title = {The studies on phonons and magnons in [CoFeB/Au]N multilayers of different number of repetitions},
author = {Aleksandra Trzaskowska and P Graczyk and Nandan K. P. Babu and Miłosz Zdunek and H Głowiński and Jarosław W. Kłos and Sławomir Mielcarek},
url = {https://www.sciencedirect.com/science/article/pii/S0304885322000300},
doi = {https://doi.org/10.1016/j.jmmm.2022.169049},
issn = {0304-8853},
year = {2022},
date = {2022-01-13},
journal = {Journal of Magnetism and Magnetic Materials},
volume = {549},
pages = {169049},
abstract = {We investigated the interaction between spin waves and surface acoustic waves in the [CoFeB/Au]N multilayer deposited on the silicon substrate by Brillion light scattering spectroscopy. We showed that this kind of coupling manifested as an anticrossing in magnetoelastic dispersion relation, can be modified by changing the number of repetitions within the multilayer. The observed modification is attributed mostly to the change in the strength of dipolar interactions which alter the dispersion branch of spin wave fundamental mode and shifts the anticrossing towards larger wave vectors where the magnetoelastic coupling is stronger. The studied range of the wave vector was varied between 0.6·105 cm−1 and 2.2·105 cm−1 while the frequency range of investigations was between 3 and 20 GHz.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We investigated the interaction between spin waves and surface acoustic waves in the [CoFeB/Au]N multilayer deposited on the silicon substrate by Brillion light scattering spectroscopy. We showed that this kind of coupling manifested as an anticrossing in magnetoelastic dispersion relation, can be modified by changing the number of repetitions within the multilayer. The observed modification is attributed mostly to the change in the strength of dipolar interactions which alter the dispersion branch of spin wave fundamental mode and shifts the anticrossing towards larger wave vectors where the magnetoelastic coupling is stronger. The studied range of the wave vector was varied between 0.6·105 cm−1 and 2.2·105 cm−1 while the frequency range of investigations was between 3 and 20 GHz.
Nandan K. P. Babu, Aleksandra Trzaskowska, Piotr Graczyk, Grzegorz Centała, Szymon Mieszczak, Hubert Głowiński, Miłosz Zdunek, Sławomir Mielcarek, Jarosław W. Kłos
@article{doi:10.1021/acs.nanolett.0c03692,
title = {The Interaction between Surface Acoustic Waves and Spin Waves: The Role of Anisotropy and Spatial Profiles of the Modes},
author = {Nandan K. P. Babu and Aleksandra Trzaskowska and Piotr Graczyk and Grzegorz Centała and Szymon Mieszczak and Hubert Głowiński and Miłosz Zdunek and Sławomir Mielcarek and Jarosław W. Kłos},
url = {https://doi.org/10.1021/acs.nanolett.0c03692},
doi = {10.1021/acs.nanolett.0c03692},
year = {2021},
date = {2021-01-01},
journal = {Nano Lett.},
volume = {21},
number = {2},
pages = {946-951},
abstract = {The interaction between different types of wave excitation in hybrid systems is usually anisotropic. Magnetoelastic coupling between surface acoustic waves and spin waves strongly depends on the direction of the external magnetic field. However, in the present study we observe that even if the orientation of the field is supportive for the coupling, the magnetoelastic interaction can be significantly reduced for surface acoustic waves with a particular profile in the direction normal to the surface at distances much smaller than the wavelength. We use Brillouin light scattering for the investigation of thermally excited phonons and magnons in a magnetostrictive CoFeB/Au multilayer deposited on a Si substrate. The experimental data are interpreted on the basis of a linearized model of interaction between surface acoustic waves and spin waves.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The interaction between different types of wave excitation in hybrid systems is usually anisotropic. Magnetoelastic coupling between surface acoustic waves and spin waves strongly depends on the direction of the external magnetic field. However, in the present study we observe that even if the orientation of the field is supportive for the coupling, the magnetoelastic interaction can be significantly reduced for surface acoustic waves with a particular profile in the direction normal to the surface at distances much smaller than the wavelength. We use Brillouin light scattering for the investigation of thermally excited phonons and magnons in a magnetostrictive CoFeB/Au multilayer deposited on a Si substrate. The experimental data are interpreted on the basis of a linearized model of interaction between surface acoustic waves and spin waves.
@article{zdunek_investigation_2020,
title = {Investigation of phonons and magnons in [Ni80Fe20/Au/Co/Au]10 multilayers},
author = {M Zdunek and A Trzaskowska and J W Kłos and N K P Babu and S Mielcarek},
url = {https://linkinghub.elsevier.com/retrieve/pii/S0304885319328525},
doi = {10.1016/j.jmmm.2020.166428},
issn = {03048853},
year = {2020},
date = {2020-01-01},
urldate = {2021-05-04},
journal = {Journal of Magnetism and Magnetic Materials},
volume = {500},
pages = {166428},
abstract = {The dispersion relations of surface acoustic waves and spin waves propagating in magnetic [Ni80Fe20/Au/Co/Au]10 multilayers deposited on a silicon substrate have been investigated by high-resolution Brillouin spectroscopy. We measured the spectra of spin waves for two canonical geometries where the spin waves propagate with the wave vector oriented parallel and perpendicular to the direction of static magnetization in-plane magnetized Py layer. We investigated experimentally the crossing of phononic and magnonic dispersion relations and discussed the mechanism of magnetoelastic interaction in this system.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The dispersion relations of surface acoustic waves and spin waves propagating in magnetic [Ni80Fe20/Au/Co/Au]10 multilayers deposited on a silicon substrate have been investigated by high-resolution Brillouin spectroscopy. We measured the spectra of spin waves for two canonical geometries where the spin waves propagate with the wave vector oriented parallel and perpendicular to the direction of static magnetization in-plane magnetized Py layer. We investigated experimentally the crossing of phononic and magnonic dispersion relations and discussed the mechanism of magnetoelastic interaction in this system.
@article{mieszczak_anomalous_2020,
title = {Anomalous Refraction of Spin Waves as a Way to Guide Signals in Curved Magnonic Multimode Waveguides},
author = {Szymon Mieszczak and Oksana Busel and Paweł Gruszecki and Andriy N Kuchko and Jarosław W. Kłos and Maciej Krawczyk},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.13.054038},
doi = {10.1103/PhysRevApplied.13.054038},
issn = {2331-7019},
year = {2020},
date = {2020-01-01},
urldate = {2021-05-04},
journal = {Physical Review Applied},
volume = {13},
number = {5},
pages = {054038},
abstract = {We present a method for efficient spin-wave guiding within the magnonic nanostructures. Our technique is based on the anomalous refraction in the metamaterial flat slab. The gradual change of the material parameters (saturation magnetization or magnetic anisotropy) across the slab allows tilting the wavefronts of the transmitted spin waves and controlling the refraction. Numerical studies of the spin-wave refraction are preceded by the analytical calculations of the phase shift acquired by the spin wave due to the change of material parameters in a confined area. We demonstrate that our findings can be used to guide the spin waves smoothly in curved waveguides, even through sharp bends, without reflection and scattering between different waveguide’s modes, preserving the phase, the quantity essential for wave computing.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We present a method for efficient spin-wave guiding within the magnonic nanostructures. Our technique is based on the anomalous refraction in the metamaterial flat slab. The gradual change of the material parameters (saturation magnetization or magnetic anisotropy) across the slab allows tilting the wavefronts of the transmitted spin waves and controlling the refraction. Numerical studies of the spin-wave refraction are preceded by the analytical calculations of the phase shift acquired by the spin wave due to the change of material parameters in a confined area. We demonstrate that our findings can be used to guide the spin waves smoothly in curved waveguides, even through sharp bends, without reflection and scattering between different waveguide’s modes, preserving the phase, the quantity essential for wave computing.
@article{trzaskowska_generation_2020,
title = {Generation of a mode in phononic crystal based on 1D/2D structures},
author = {A Trzaskowska and P Hakonen and M Wiesner and S Mielcarek},
url = {https://linkinghub.elsevier.com/retrieve/pii/S0041624X20300858},
doi = {10.1016/j.ultras.2020.106146},
issn = {0041624X},
year = {2020},
date = {2020-01-01},
urldate = {2021-05-04},
journal = {Ultrasonics},
volume = {106},
pages = {106146},
abstract = {The modification of phononic crystals by surface structuring allows obtaining a new parameter describing the dynamics of the structure produced in this way. We have investigated the dispersion relation of surface acoustic waves propagating in a phononic material which is based on nanometer-scale surface modulation using interconnected one-dimensional array of stripes and a two-dimensional array of pillars. The influence of these two array components on the dispersion relation has been determined experimentally (Brillouin light scattering) and theoretically (Finite Element Method). The interaction of these two nanostructures supports a new mode which is not observed in independent structures of pillars and stripes. The influence of the relative position of these two nanostructures on the frequency of the new mode has been determined.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The modification of phononic crystals by surface structuring allows obtaining a new parameter describing the dynamics of the structure produced in this way. We have investigated the dispersion relation of surface acoustic waves propagating in a phononic material which is based on nanometer-scale surface modulation using interconnected one-dimensional array of stripes and a two-dimensional array of pillars. The influence of these two array components on the dispersion relation has been determined experimentally (Brillouin light scattering) and theoretically (Finite Element Method). The interaction of these two nanostructures supports a new mode which is not observed in independent structures of pillars and stripes. The influence of the relative position of these two nanostructures on the frequency of the new mode has been determined.
@article{szulc_remagnetization_2019,
title = {Remagnetization in arrays of ferromagnetic nanostripes with periodic and quasiperiodic order},
author = {K Szulc and F Lisiecki and A Makarov and M Zelent and P Kuświk and H Głowiński and J W Kłos and M Münzenberg and R Gieniusz and J Dubowik and F Stobiecki and M Krawczyk},
url = {https://link.aps.org/doi/10.1103/PhysRevB.99.064412},
doi = {10.1103/PhysRevB.99.064412},
issn = {2469-9950, 2469-9969},
year = {2019},
date = {2019-01-01},
urldate = {2021-05-04},
journal = {Physical Review B},
volume = {99},
number = {6},
pages = {064412},
abstract = {We investigate experimentally and theoretically the magnetization reversal process in one-dimensional magnonic structures composed of permalloy nanostripes of the two different widths and finite length arranged in a periodic and quasiperiodic order. We showed that dipolar coupling between rectangular nanostripes is significantly reduced as compared to the analytical and numerical predictions, probably due to formation of the closure domains at the nanostripe ends. Although the main feature of the hysteresis loop is determined by different shape anisotropies of the component elements and the dipolar interactions between them, the quasiperiodic order influences the hysteresis loop by introducing additional tiny switching steps and change of the plateau width. We also showed that the dipolar interactions between nanostripes forming a ribbon can be counterintuitively decreased by reduction of the distance between the neighboring ribbons.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We investigate experimentally and theoretically the magnetization reversal process in one-dimensional magnonic structures composed of permalloy nanostripes of the two different widths and finite length arranged in a periodic and quasiperiodic order. We showed that dipolar coupling between rectangular nanostripes is significantly reduced as compared to the analytical and numerical predictions, probably due to formation of the closure domains at the nanostripe ends. Although the main feature of the hysteresis loop is determined by different shape anisotropies of the component elements and the dipolar interactions between them, the quasiperiodic order influences the hysteresis loop by introducing additional tiny switching steps and change of the plateau width. We also showed that the dipolar interactions between nanostripes forming a ribbon can be counterintuitively decreased by reduction of the distance between the neighboring ribbons.
@article{centala_influence_2019,
title = {Influence of nonmagnetic dielectric spacers on the spin-wave response of one-dimensional planar magnonic crystals},
author = {G Centała and M L Sokolovskyy and C S Davies and M Mruczkiewicz and S Mamica and J Rychły and J W Kłos and V V Kruglyak and M Krawczyk},
url = {https://link.aps.org/doi/10.1103/PhysRevB.100.224428},
doi = {10.1103/PhysRevB.100.224428},
issn = {2469-9950, 2469-9969},
year = {2019},
date = {2019-01-01},
urldate = {2021-05-04},
journal = {Physical Review B},
volume = {100},
number = {22},
pages = {224428},
abstract = {One-dimensional planar magnonic crystals are usually fabricated as a sequence of stripes intentionally or accidentally separated by nonmagnetic spacers. The influence of spacers on shaping the spin-wave spectra is complex and still not completely clarified. We perform detailed numerical studies of the one-dimensional single- and bicomponent magnonic crystals comprised of a periodic array of thin ferromagnetic stripes separated by nonmagnetic spacers. We show that the dynamic dipolar interactions between the stripes, mediated even by ultranarrow nonmagnetic spacers, lead to a significant increase in the frequency of the ferromagnetic resonance mode, while simultaneously reducing the spin-wave group velocity. We attribute these spectral deformations to the modifications of dipolar pinning and shape anisotropy, both of which are dependent on the width of the spacers and the thickness of the stripes, as well as changes with the dynamical magnetic volume charges formed due to inhomogeneous spin-wave amplitude.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
One-dimensional planar magnonic crystals are usually fabricated as a sequence of stripes intentionally or accidentally separated by nonmagnetic spacers. The influence of spacers on shaping the spin-wave spectra is complex and still not completely clarified. We perform detailed numerical studies of the one-dimensional single- and bicomponent magnonic crystals comprised of a periodic array of thin ferromagnetic stripes separated by nonmagnetic spacers. We show that the dynamic dipolar interactions between the stripes, mediated even by ultranarrow nonmagnetic spacers, lead to a significant increase in the frequency of the ferromagnetic resonance mode, while simultaneously reducing the spin-wave group velocity. We attribute these spectral deformations to the modifications of dipolar pinning and shape anisotropy, both of which are dependent on the width of the spacers and the thickness of the stripes, as well as changes with the dynamical magnetic volume charges formed due to inhomogeneous spin-wave amplitude.
@article{kharlan_standing_2019,
title = {Standing spin waves in perpendicularly magnetized triangular dots},
author = {Yulia Kharlan and Pavlo Bondarenko and Maciej Krawczyk and Olga Salyuk and Elena V. Tartakovskaya and Aleksandra Trzaskowska and Vladimir Golub},
url = {https://link.aps.org/doi/10.1103/PhysRevB.100.184416},
doi = {10.1103/PhysRevB.100.184416},
issn = {2469-9950, 2469-9969},
year = {2019},
date = {2019-01-01},
urldate = {2021-05-04},
journal = {Physical Review B},
volume = {100},
number = {18},
pages = {184416},
abstract = {Standing spin waves in triangular dots (truncated pyramids) were investigated both experimentally and theoretically. Arrays of nickel triangular pyramids with the base side of 270 nm and height of 70 nm were deposited on Si (111) substrate. The spectra of ferromagnetic resonance were obtained at room temperature with an external saturating magnetic field directed perpendicular to the array plane. The theoretical approach, which allows to describe standing spin wave modes both in perpendicular magnetized regular prisms and in close to prisms truncated pyramids, was developed. Theoretically calculated resonance fields for the observed modes are in a good correlation with the experiment.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Standing spin waves in triangular dots (truncated pyramids) were investigated both experimentally and theoretically. Arrays of nickel triangular pyramids with the base side of 270 nm and height of 70 nm were deposited on Si (111) substrate. The spectra of ferromagnetic resonance were obtained at room temperature with an external saturating magnetic field directed perpendicular to the array plane. The theoretical approach, which allows to describe standing spin wave modes both in perpendicular magnetized regular prisms and in close to prisms truncated pyramids, was developed. Theoretically calculated resonance fields for the observed modes are in a good correlation with the experiment.
Filip Lisiecki, Justyna Rychły, Piotr Kuświk, Hubert Głowiński, Jarosław W Kłos, Felix Groß, Iuliia Bykova, Markus Weigand, Mateusz Zelent, Eberhard J Goering, Gisela Schütz, Gianluca Gubbiotti, Maciej Krawczyk, Feliks Stobiecki, Janusz Dubowik, Joachim Gräfe
@article{lisiecki_reprogrammability_2019,
title = {Reprogrammability and Scalability of Magnonic Fibonacci Quasicrystals},
author = {Filip Lisiecki and Justyna Rychły and Piotr Kuświk and Hubert Głowiński and Jarosław W Kłos and Felix Groß and Iuliia Bykova and Markus Weigand and Mateusz Zelent and Eberhard J Goering and Gisela Schütz and Gianluca Gubbiotti and Maciej Krawczyk and Feliks Stobiecki and Janusz Dubowik and Joachim Gräfe},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.11.054003},
doi = {10.1103/PhysRevApplied.11.054003},
issn = {2331-7019},
year = {2019},
date = {2019-01-01},
urldate = {2021-05-04},
journal = {Physical Review Applied},
volume = {11},
number = {5},
pages = {054003},
abstract = {Magnonic crystals are systems that can be used to design and tune the dynamic properties of magnetization. Here, we focus on one-dimensional Fibonacci magnonic quasicrystals. We confirm the existence of collective spin waves propagating through the structure as well as dispersionless modes; the reprogammability of the resonance frequencies, dependent on the magnetization order; and dynamic spin-wave interactions. With the fundamental understanding of these properties, we lay a foundation for the scalable and advanced design of spin-wave band structures for spintronic, microwave, and magnonic applications.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Magnonic crystals are systems that can be used to design and tune the dynamic properties of magnetization. Here, we focus on one-dimensional Fibonacci magnonic quasicrystals. We confirm the existence of collective spin waves propagating through the structure as well as dispersionless modes; the reprogammability of the resonance frequencies, dependent on the magnetization order; and dynamic spin-wave interactions. With the fundamental understanding of these properties, we lay a foundation for the scalable and advanced design of spin-wave band structures for spintronic, microwave, and magnonic applications.
Filip Lisiecki, Justyna Rychły, Piotr Kuświk, Hubert Głowiński, Jarosław W Kłos, Felix Groß, Nick Träger, Iuliia Bykova, Markus Weigand, Mateusz Zelent, Eberhard J Goering, Gislea Schütz, Maciej Krawczyk, Feliks Stobiecki, Janusz Dubowik, Joachim Gräfe
@article{lisiecki_magnons_2019,
title = {Magnons in a Quasicrystal: Propagation, Extinction, and Localization of Spin Waves in Fibonacci Structures},
author = {Filip Lisiecki and Justyna Rychły and Piotr Kuświk and Hubert Głowiński and Jarosław W Kłos and Felix Groß and Nick Träger and Iuliia Bykova and Markus Weigand and Mateusz Zelent and Eberhard J Goering and Gislea Schütz and Maciej Krawczyk and Feliks Stobiecki and Janusz Dubowik and Joachim Gräfe},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.11.054061},
doi = {10.1103/PhysRevApplied.11.054061},
issn = {2331-7019},
year = {2019},
date = {2019-01-01},
urldate = {2021-05-04},
journal = {Physical Review Applied},
volume = {11},
number = {5},
pages = {054061},
abstract = {Magnonic quasicrystals exceed the possibilities of spin-wave (SW) manipulation offered by regular magnonic crystals, because of their more complex SW spectra with fractal characteristics. Here, we report the direct x-ray microscopic observation of propagating SWs in a magnonic quasicrystal, consisting of dipolar coupled permalloy nanowires arranged in a one-dimensional Fibonacci sequence. SWs from the first and second band as well as evanescent waves from the band gap between them are imaged. Moreover, additional mini band gaps in the spectrum are demonstrated, directly indicating an influence of the quasiperiodicity of the system. Finally, the localization of SW modes within the Fibonacci crystal is shown. The experimental results are interpreted using numerical calculations and we deduce a simple model to estimate the frequency position of the magnonic gaps in quasiperiodic structures. The demonstrated features of SW spectra in one-dimensional magnonic quasicrystals allow utilizing this class of metamaterials for magnonics and make them an ideal basis for future applications.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Magnonic quasicrystals exceed the possibilities of spin-wave (SW) manipulation offered by regular magnonic crystals, because of their more complex SW spectra with fractal characteristics. Here, we report the direct x-ray microscopic observation of propagating SWs in a magnonic quasicrystal, consisting of dipolar coupled permalloy nanowires arranged in a one-dimensional Fibonacci sequence. SWs from the first and second band as well as evanescent waves from the band gap between them are imaged. Moreover, additional mini band gaps in the spectrum are demonstrated, directly indicating an influence of the quasiperiodicity of the system. Finally, the localization of SW modes within the Fibonacci crystal is shown. The experimental results are interpreted using numerical calculations and we deduce a simple model to estimate the frequency position of the magnonic gaps in quasiperiodic structures. The demonstrated features of SW spectra in one-dimensional magnonic quasicrystals allow utilizing this class of metamaterials for magnonics and make them an ideal basis for future applications.
@article{mamica_reversible_2019,
title = {Reversible tuning of omnidirectional band gaps in two-dimensional magnonic crystals by magnetic field and in-plane squeezing},
author = {S Mamica and M Krawczyk},
url = {https://link.aps.org/doi/10.1103/PhysRevB.100.214410},
doi = {10.1103/PhysRevB.100.214410},
issn = {2469-9950, 2469-9969},
year = {2019},
date = {2019-01-01},
urldate = {2021-05-04},
journal = {Physical Review B},
volume = {100},
number = {21},
pages = {214410},
abstract = {By means of the plane-wave method, we study nonuniform, i.e., mode- and k-dependent, effects in the spin-wave spectrum of a two-dimensional bicomponent magnonic crystal. We use the crystal based on a hexagonal lattice squeezed in the direction of the external magnetic field wherein the squeezing applies to the lattice and the shape of inclusions. The squeezing changes both the demagnetizing field and the spatial confinement of the excitation, which may lead to the occurrence of an omnidirectional magnonic band gap. In particular, we study the role played by propagational effects, which allows us to explain the k-dependent softening of modes. The effects we found enabled us not only to design the width and position of magnonic band gaps, but also to plan their response to a change in the external magnetic field magnitude. This allows the reversible tuning of magnonic band gaps, and it shows that the studied structures are promising candidates for designing magnonic devices that are tunable during operation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
By means of the plane-wave method, we study nonuniform, i.e., mode- and k-dependent, effects in the spin-wave spectrum of a two-dimensional bicomponent magnonic crystal. We use the crystal based on a hexagonal lattice squeezed in the direction of the external magnetic field wherein the squeezing applies to the lattice and the shape of inclusions. The squeezing changes both the demagnetizing field and the spatial confinement of the excitation, which may lead to the occurrence of an omnidirectional magnonic band gap. In particular, we study the role played by propagational effects, which allows us to explain the k-dependent softening of modes. The effects we found enabled us not only to design the width and position of magnonic band gaps, but also to plan their response to a change in the external magnetic field magnitude. This allows the reversible tuning of magnonic band gaps, and it shows that the studied structures are promising candidates for designing magnonic devices that are tunable during operation.
@article{mamica_nonuniform_2019,
title = {Nonuniform Spin-Wave Softening in Two-Dimensional Magnonic Crystals as a Tool for Opening Omnidirectional Magnonic Band Gaps},
author = {S Mamica and M Krawczyk and D Grundler},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.11.054011},
doi = {10.1103/PhysRevApplied.11.054011},
issn = {2331-7019},
year = {2019},
date = {2019-01-01},
urldate = {2021-05-04},
journal = {Physical Review Applied},
volume = {11},
number = {5},
pages = {054011},
abstract = {By means of the plane-wave method we study spin-wave dynamics in two-dimensional bicomponent magnonic crystals based on a squeezed hexagonal lattice and consist of a permalloy thin film with cobalt inclusions. We explore the dependence of a spin-wave frequency on the external magnetic field, especially in weak fields where the mode softening takes place. For considered structures, the mode softening proves to be highly nonuniform on both the mode number and the wave vector. We find this effect to be responsible for the omnidirectional band gap opening. Moreover, we show that the enhancement of the demagnetizing field caused by the squeezing of the structure is of crucial importance for the nonuniform mode softening. This allows us to employ this mechanism to design magnonic gaps with different sensitivity for the tiny change of the external field. The effects we find should be useful in designing and optimization of spin-wave filters highly tunable by an external magnetic field.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
By means of the plane-wave method we study spin-wave dynamics in two-dimensional bicomponent magnonic crystals based on a squeezed hexagonal lattice and consist of a permalloy thin film with cobalt inclusions. We explore the dependence of a spin-wave frequency on the external magnetic field, especially in weak fields where the mode softening takes place. For considered structures, the mode softening proves to be highly nonuniform on both the mode number and the wave vector. We find this effect to be responsible for the omnidirectional band gap opening. Moreover, we show that the enhancement of the demagnetizing field caused by the squeezing of the structure is of crucial importance for the nonuniform mode softening. This allows us to employ this mechanism to design magnonic gaps with different sensitivity for the tiny change of the external field. The effects we find should be useful in designing and optimization of spin-wave filters highly tunable by an external magnetic field.
@article{babu_interaction_2019,
title = {Interaction Between Thermal Magnons and Phonons in a CoFeB/Au Multilayer},
author = {Nandan K P Babu and Aleksandra Trzaskowska and Sławomir Mielcarek and Hubert Głowinski and Oleksandr M. Chumak and Miłosz Zdunek and Jarosław W. Kłos and Maciej Krawczyk},
url = {https://ieeexplore.ieee.org/document/8886514/},
doi = {10.1109/LMAG.2019.2950304},
issn = {1949-307X, 1949-3088},
year = {2019},
date = {2019-01-01},
urldate = {2021-05-04},
journal = {IEEE Magnetics Letters},
volume = {10},
pages = {1--5},
abstract = {The dispersion relations of thermal magnons and phonons, which exist in a multilayered CoFeB/Au sample deposited on a silicon substrate, were determined by using Brillouin light scattering spectrometry in the oblique geometry, for the 45° angle between the in-plane-oriented static magnetization and the wave vector. Due to the low effective saturation magnetization of the multilayer, we were able to measure the crossing between the dispersion branches for spin waves and surface acoustic waves with the signature of the magnetoelastic interactions in the form of a coalescence of dispersion branches. The oblique geometry was chosen to enhance the interaction between both kinds of waves.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The dispersion relations of thermal magnons and phonons, which exist in a multilayered CoFeB/Au sample deposited on a silicon substrate, were determined by using Brillouin light scattering spectrometry in the oblique geometry, for the 45° angle between the in-plane-oriented static magnetization and the wave vector. Due to the low effective saturation magnetization of the multilayer, we were able to measure the crossing between the dispersion branches for spin waves and surface acoustic waves with the signature of the magnetoelastic interactions in the form of a coalescence of dispersion branches. The oblique geometry was chosen to enhance the interaction between both kinds of waves.
@article{PhysRevB.98.054405,
title = {Spin-wave dynamics in artificial anti-spin-ice systems: Experimental and theoretical investigations},
author = {S Mamica and X Zhou and A Adeyeye and M Krawczyk and G Gubbiotti},
url = {https://link.aps.org/doi/10.1103/PhysRevB.98.054405},
doi = {10.1103/PhysRevB.98.054405},
year = {2018},
date = {2018-08-01},
journal = {Phys. Rev. B},
volume = {98},
pages = {054405},
publisher = {American Physical Society},
abstract = {Reversed structures of artificial spin-ice systems, where elongated holes with elliptical shape (antidots) are arranged into a square array with two orthogonal sublattices, are referred to as antisquared spin ice. Using Brillouin light-scattering spectroscopy and plane-wave-method calculations, we investigate the spin-wave propagation perpendicular to the applied field direction for two 20-nm-thick Permalloy nanostructures which differ by the presence of single- and double-elliptical antidots. For the spin-wave propagation along the principal antidot lattice axis, the spectrum consists of flat bands separated by several frequency gaps which are the effect of spin-wave amplitude confinement in the regions between antidots. Contrarily, for propagation direction at 45° with respect to the antidot symmetry axis, straight and narrow channels of propagation are formed, leading to broadening of bands and closing of the magnonics gaps. Interestingly, in this case, extra magnonic band gaps occur due to the additional periodicity along this direction. The width and the position of these gaps depend on the presence of single or double antidots. In this context, we discuss possibilities for the tuning of spin-wave spectra in antisquared spin-ice structures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Reversed structures of artificial spin-ice systems, where elongated holes with elliptical shape (antidots) are arranged into a square array with two orthogonal sublattices, are referred to as antisquared spin ice. Using Brillouin light-scattering spectroscopy and plane-wave-method calculations, we investigate the spin-wave propagation perpendicular to the applied field direction for two 20-nm-thick Permalloy nanostructures which differ by the presence of single- and double-elliptical antidots. For the spin-wave propagation along the principal antidot lattice axis, the spectrum consists of flat bands separated by several frequency gaps which are the effect of spin-wave amplitude confinement in the regions between antidots. Contrarily, for propagation direction at 45° with respect to the antidot symmetry axis, straight and narrow channels of propagation are formed, leading to broadening of bands and closing of the magnonics gaps. Interestingly, in this case, extra magnonic band gaps occur due to the additional periodicity along this direction. The width and the position of these gaps depend on the presence of single or double antidots. In this context, we discuss possibilities for the tuning of spin-wave spectra in antisquared spin-ice structures.
@article{klos_hartman_2018,
title = {Hartman effect for spin waves in exchange regime},
author = {Jarosław W Kłos and Yuliya S Dadoenkova and Justyna Rychły and Nataliya N Dadoenkova and Igor L Lyubchanskii and Józef Barnaś},
url = {https://www.nature.com/articles/s41598-018-35761-1},
doi = {10.1038/s41598-018-35761-1},
issn = {2045-2322},
year = {2018},
date = {2018-01-01},
urldate = {2021-05-04},
journal = {Scientific Reports},
volume = {8},
number = {1},
pages = {17944},
abstract = {Hartman effect for spin waves tunnelling through a barrier in a thin magnetic film is considered theoretically. The barrier is assumed to be created by a locally increased magnetic anisotropy field. The considerations are focused on a nanoscale system operating in the exchange-dominated regime. We derive the formula for group delay τgr of a spin wave packet and show that τgr saturates with increasing barrier width, which is a signature of the Hartman effect predicted earlier for photonic and electronic systems. In our calculations, we consider the general boundary conditions which take into account different strength of exchange coupling between the barrier and its surrounding. As a system suitable for experimental observation of the Hartman effect we propose a CoFeB layer with perpendicular magnetic anisotropy induced by a MgO overlayer.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hartman effect for spin waves tunnelling through a barrier in a thin magnetic film is considered theoretically. The barrier is assumed to be created by a locally increased magnetic anisotropy field. The considerations are focused on a nanoscale system operating in the exchange-dominated regime. We derive the formula for group delay τgr of a spin wave packet and show that τgr saturates with increasing barrier width, which is a signature of the Hartman effect predicted earlier for photonic and electronic systems. In our calculations, we consider the general boundary conditions which take into account different strength of exchange coupling between the barrier and its surrounding. As a system suitable for experimental observation of the Hartman effect we propose a CoFeB layer with perpendicular magnetic anisotropy induced by a MgO overlayer.
@article{chang_driving_2018,
title = {Driving Magnetization Dynamics in an On-Demand Magnonic Crystal via the Magnetoelastic Interactions},
author = {C L Chang and S Mieszczak and M Zelent and V Besse and U Martens and R R Tamming and J Janusonis and P Graczyk and M Münzenberg and J W Kłos and R I Tobey},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.10.064051},
doi = {10.1103/PhysRevApplied.10.064051},
issn = {2331-7019},
year = {2018},
date = {2018-01-01},
urldate = {2021-05-04},
journal = {Physical Review Applied},
volume = {10},
number = {6},
pages = {064051},
abstract = {Using spatial light interference of ultrafast laser pulses, we generate a lateral modulation in the magnetization profile of an otherwise uniformly magnetized film, whose magnetic excitation spectrum is monitored via the coherent and resonant interaction with elastic waves. We find an unusual dependence of the magnetoelastic coupling as the externally applied magnetic field is angle- and field-tuned relative to the wave vector of the magnetization modulation, which can be explained by the emergence of spatially inhomogeneous spin-wave modes. In this regard, the spatial light interference methodology can be seen as a user-configurable, temporally windowed, on-demand magnonic crystal, potentially of arbitrary two-dimensional shape, which allows control and selectivity of the spatial distribution of spin waves. Calculations of spin waves using a variety of methods, demonstrated here using the plane-wave method and micromagnetic simulation, can identify the spatial distribution and associated energy scales of each excitation, which opens the door to a number of excitation methodologies beyond our chosen elastic wave excitation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Using spatial light interference of ultrafast laser pulses, we generate a lateral modulation in the magnetization profile of an otherwise uniformly magnetized film, whose magnetic excitation spectrum is monitored via the coherent and resonant interaction with elastic waves. We find an unusual dependence of the magnetoelastic coupling as the externally applied magnetic field is angle- and field-tuned relative to the wave vector of the magnetization modulation, which can be explained by the emergence of spatially inhomogeneous spin-wave modes. In this regard, the spatial light interference methodology can be seen as a user-configurable, temporally windowed, on-demand magnonic crystal, potentially of arbitrary two-dimensional shape, which allows control and selectivity of the spatial distribution of spin waves. Calculations of spin waves using a variety of methods, demonstrated here using the plane-wave method and micromagnetic simulation, can identify the spatial distribution and associated energy scales of each excitation, which opens the door to a number of excitation methodologies beyond our chosen elastic wave excitation.
@article{PhysRevB.96.024407,
title = {Coupled-mode theory for the interaction between acoustic waves and spin waves in magnonic-phononic crystals: Propagating magnetoelastic waves},
author = {Piotr Graczyk and Maciej Krawczyk},
url = {https://link.aps.org/doi/10.1103/PhysRevB.96.024407},
doi = {10.1103/PhysRevB.96.024407},
year = {2017},
date = {2017-07-01},
journal = {Phys. Rev. B},
volume = {96},
pages = {024407},
publisher = {American Physical Society},
abstract = {We have investigated codirectional and contradirectional couplings between spin wave and acoustic wave in a one-dimensional periodic structure (the so-called magphonic crystal). The system consists of two ferromagnetic layers alternating in space. We have taken into consideration materials commonly used in magnonics: yttrium iron garnet, CoFeB, permalloy, and cobalt. The coupled mode theory (CMT) formalism has been successfully implemented to describe the magnetoelastic interaction as a periodic perturbation in the magphonic crystal. The results of CMT calculations have been verified by more rigorous simulations with the frequency-domain plane-wave method and the time-domain finite-element method. The presented resonant coupling in the magphonic crystal is an active in-space mechanism which spatially transfers energy between propagating spin and acoustic modes, thus creating a propagating magnetoelastic wave. We have shown that CMT analysis of the magnetoelastic coupling is an useful tool to optimize and design a spin wave–acoustic wave transducer based on magphonic crystals. The effect of spin-wave damping has been included to the model to discuss the efficiency of such a device. Our model shows that it is possible to obtain forward conversion of the acoustic wave to the spin wave in case of codirectional coupling and backward conversion in case of contradirectional coupling. That energy transfer may be realized for broadband coupling and for generation of spin waves which are of different wavelength (in particular, shorter) than exciting acoustic waves.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We have investigated codirectional and contradirectional couplings between spin wave and acoustic wave in a one-dimensional periodic structure (the so-called magphonic crystal). The system consists of two ferromagnetic layers alternating in space. We have taken into consideration materials commonly used in magnonics: yttrium iron garnet, CoFeB, permalloy, and cobalt. The coupled mode theory (CMT) formalism has been successfully implemented to describe the magnetoelastic interaction as a periodic perturbation in the magphonic crystal. The results of CMT calculations have been verified by more rigorous simulations with the frequency-domain plane-wave method and the time-domain finite-element method. The presented resonant coupling in the magphonic crystal is an active in-space mechanism which spatially transfers energy between propagating spin and acoustic modes, thus creating a propagating magnetoelastic wave. We have shown that CMT analysis of the magnetoelastic coupling is an useful tool to optimize and design a spin wave–acoustic wave transducer based on magphonic crystals. The effect of spin-wave damping has been included to the model to discuss the efficiency of such a device. Our model shows that it is possible to obtain forward conversion of the acoustic wave to the spin wave in case of codirectional coupling and backward conversion in case of contradirectional coupling. That energy transfer may be realized for broadband coupling and for generation of spin waves which are of different wavelength (in particular, shorter) than exciting acoustic waves.
@article{PhysRevB.95.104425,
title = {Broadband magnetoelastic coupling in magnonic-phononic crystals for high-frequency nanoscale spin-wave generation},
author = {Piotr Graczyk and Jarosław W. Kłos and Maciej Krawczyk},
url = {https://link.aps.org/doi/10.1103/PhysRevB.95.104425},
doi = {10.1103/PhysRevB.95.104425},
year = {2017},
date = {2017-03-01},
journal = {Phys. Rev. B},
volume = {95},
pages = {104425},
publisher = {American Physical Society},
abstract = {Spin waves are promising candidates for information carriers in advanced technology. The interactions between spin waves and acoustic waves in magnetic nanostructures are of much interest because of their potential application for spin-wave generation, amplification, and transduction. We investigate numerically the dynamics of magnetoelastic excitations in a one-dimensional magnonic-phononic crystal consisting of alternating layers of permalloy and cobalt. We use the plane-wave method and the finite-element method for frequency- and time-domain simulations, respectively. The studied structure is optimized for hybridization of specific spin-wave and acoustic dispersion branches in the entire Brillouin zone in a broad frequency range. We show that this type of periodic structure can be used for efficient generation of high-frequency spin waves.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Spin waves are promising candidates for information carriers in advanced technology. The interactions between spin waves and acoustic waves in magnetic nanostructures are of much interest because of their potential application for spin-wave generation, amplification, and transduction. We investigate numerically the dynamics of magnetoelastic excitations in a one-dimensional magnonic-phononic crystal consisting of alternating layers of permalloy and cobalt. We use the plane-wave method and the finite-element method for frequency- and time-domain simulations, respectively. The studied structure is optimized for hybridization of specific spin-wave and acoustic dispersion branches in the entire Brillouin zone in a broad frequency range. We show that this type of periodic structure can be used for efficient generation of high-frequency spin waves.
XXXVI Dynamical Properties of Solids, 27-31.08.2017, Kraków, Poland P. Graczyk , J. Kłos and M. Krawczyk Optimizing acoustic wave – spin wave resonant coupling in the magphonic crystal, poster
Energy Materials Nanotechnology – Europe Meetings, 11-15.09.2017, Barcelone, Spain Hubert Głowiński, Adam Krysztofik, Piotr Kuświk, Emerson Coy, Janusz Dubowik Epitaxial yttrium iron garnet thin films for spin wave spectroscopy, invited talk
Joint meeting of the DPG and EPS Condensed Matter Divisions, 11-16.03.2018, Berlin, Germany Chia-Lin Chang, Szymon Mieszczak, Ronnie Tamming, Mateusz Zelent, Julius Janusonis, Piotr Graczyk, Jarosław W. Kłos, Raanan I Tobey A spin waves optical pumping in reconfigurable magnonic crystal, talk
IEEE International Conference on Microwave Magnetics, 24-27.06.2018, Exeter, UK, J. W. Kłos, Y.S. Dadoenkova, J. Rychły, N. N. Dadoenkova, I. L. Lyubchnanskii, J. Barnaś Harman effect for spin waves in exchange regime, talk
ICM 2018, International Conference on Magnetism, 15-20.07.2018, San Francisco, USA J. N. Rychly, G.Centala, J. W. Klos, V. Novosad Spin wave propagation in the nanostripes – tuning of dynamical coupling, poster
3rd International Advanced School on Magnonics (Magnonics 2018), 17-21.09.2018, Kijów, Ukraina S. Mamica, X. Zhou, A. Adeyeye, M. Krawczyk, G. Gubbiotti Spin wave dynamics in artificial anti-spin-ice systems, poster
3rd International Advanced School on Magnonics (Magnonics 2018), 17-21.09.2018, Kijów, Ukraine S. Mamica, M. Krawczyk, D. Grundler Non-uniform softening of spin waves in two-dimensional magnonic crystals as a tool for a reversible tuning of omnidirectional band gaps, poster
SPIE Nanoscience + Engineering, 11-15.08.2019 San Diego, California, USA J. Gräfe, M. Weigand, B. van Waeyenberge, A. Gangwar, F. Groß, F. Lisiecki, J. Rychly, H. Stoll, N. Träger, J. Förster, F. Stobiecki, J. Dubowik, J. Klos, M. Krawczyk, C. H. Back, E. J. Goering, G. Schütz Visualizing nanoscale spin waves using MAXYMUS, talk
10th JEMS conference, (Joint European Magnetic Symposia), 26-30.08.2019, Uppsala, Szwecja S. Mieszczak, G. Centała, J. Rychły, M. Krawczyk, J. W. Kłos Spin wave localization on phasons in magnonic defects, talk
37th International Symposium on Dynamical Properties of Solids (DyProSo 2019), 09.08-12.2019, Ferrara, Italy J. Rychły, V.S. Tkachenko, J. W. Kłos, A.N. Kuchko, M. Krawczyk Spin Wave Modes in a Cylindrical Nanowire in Crossover of Dipolar-Exchange Regime, talk
META 2019, the 10th International Conference on Metamaterials, Photonic Crystals and Plasmonics, 23-26.07.2019, Lizbona, Portugalia J.W. Kłos, I.L. Lyubchanskii, Y.S. Dadoenkova, M. Krawczyk, N.N. Dadoenkova Spin waves and electromagnetic waves in photonic-magnonic crystals, talk
24th Soft Magnetic Materials Conference, 04-07.09.2019,Poznań, Polska M. Zdunek, A. Trzaskowska, S. Mielcarek, J.W. Kłos, Nandan K.P. Babu, M. Wiesner, P. Kuświk Investigation of phonons and magnons in [Ni80Fe20/Au/Co/Au]10 multilayers, talk
24th Soft Magnetic Materials Conference, 04-07.09.2019,Poznań, Polska S. Mieszczak, G. Centała, J. Rychły, M. Krawczyk, J.W. Kłos, Spin wave defect states in magnonic quasicrystal, poster
24th Soft Magnetic Materials Conference, 04-07.09.2019,Poznań, Polska J. W. Kłos, S. Mieszczak, O. Busel, J. Rychły, M. Zelent Phase and group delay of the spin waves scattered on magnetic barrier, poster
45. Zjazd Fizyków Polskich, 13-18.09.2019, Kraków, Polska G. Centała M.L. Sokolovskyy, C.S. Davies, M. Mruczkiewicz, S. Mamica, J. Rychły, J.W. Kłos, V. Kruglyak, M. Krawczyk Efekty dipolowe w planarnych kryształach magnonicznych, talk
45. Zjazd Fizyków Polskich, 13-18.09.2019, Kraków, Polska S. Mieszczak, G. Centała, J. Rychły, M. Krawczyk, J. Kłos Lokalizacja fali spinowej na defektach fazonowych w kwazikryształach magnonicznych, poster
10th JEMS conference, (Joint European Magnetic Symposia), 7-11.12.2020, Lizbona, Portugalia Miłosz Zdunek Study of phonons’ and magnons’ properties in (Ni80Fe20/Au/Co/Au) multilayers of different number of repetitions, talk
IEEE International Magnetics Virtual Conference (Intermag), 26-30.04.2021, Lyon, France (virtual conference) N.K. Babu, A. Trzaskowska, P. Graczyk, G. Centala, S. Mieszczak, H. Glowinski, M. Zdunek, S. Mielcarek and J.W. Klos The interaction between surface acoustic waves and spin waves: the role of anisotropy and spatial profiles of the modes, talk
The European Conference Physics of Magnetism’21, 28.06-02.07.2021, Poznań, Poland A. Trzaskowska, N.K.P. Babu, J.W. Kłos, M. Zdunek, and S. Mielcarek The studies on phonons and magnons in [CoFeB/Au]N multilayers of different number of repetitions, poster
2022 Joint MMM-INTERMAG conference, 10-14.01.2022, New Orleans, USA N.K. Babu, A. Trzaskowska, P. Graczyk, G. Centala, S. Mieszczak, H. Glowinski, M. Zdunek, S. Mielcarek and J.W. Klos Conditions for effective coupling between surface acoustic waves and spin waves, invited talk
