@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}
}

@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}
}

@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{10.1063/5.0162561,
title = {Giant four-fold magnetic anisotropy in nanotwinned NiMnGa epitaxial films},
author = {Pavlo V Bondarenko and Yulia Kharlan and Sergey A Bunyaev and Olga Salyuk and Ivan R Aseguinolaza and Jose M Barandiaran and Gleb N Kakazei and Volodymyr Chernenko and Vladimir O Golub},
url = {https://doi.org/10.1063/5.0162561},
doi = {10.1063/5.0162561},
issn = {2166-532X},
year = {2023},
date = {2023-12-23},
journal = {APL Materials},
volume = {11},
number = {12},
pages = {121114},
abstract = {A giant four-fold magnetic anisotropy (with an anisotropy field up to 4 kOe) was observed in the twinned NiMnGa epitaxial film. Its appearance is explained in terms of moderate coupling between twin variants having strong uniaxial magnetocrystalline anisotropies directed orthogonally when the intertwin exchange field is comparable with the anisotropy field. This finding paves the way to increase the order of magnetic anisotropy in a many-component system while keeping the value of the anisotropy field by tuning the intercomponent exchange strength and can be extended to exchange-coupled multilayers and arrays of nanoelements.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{LVOV2023170906,
title = {Nonrelaxational FMR peak broadening in spatially inhomogeneous films},
author = {Victor A L'vov and Yulia Kharlan and Vladimir O Golub},
url = {https://www.sciencedirect.com/science/article/pii/S0304885323005565},
doi = {https://doi.org/10.1016/j.jmmm.2023.170906},
issn = {0304-8853},
year = {2023},
date = {2023-08-15},
journal = {Journal of Magnetism and Magnetic Materials},
volume = {580},
pages = {170906},
abstract = {The modification of magnetic properties in spatially inhomogeneous epitaxial films of magnetic shape memory alloys in martensitic state with the temperature variation has been studied. The proposed theoretical model is based on Landau theory of martensitic transformation and statistical model of martensitic state. It was shown that that spatial inhomogeneity of the material leads to the dispersion of local martensitic transformation temperatures resulting in the variation of local magnetic anisotropy values. This model allows describing the dramatic ferromagnetic resonance line broadening observed in the experiments in epitaxial films of magnetic shape memory alloys at low temperatures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{PhysRevApplied.19.044087,
title = {Controlling Selection Rules for Magnon Scattering in Nanomagnets by Spatial Symmetry Breaking},
author = {Arezoo Etesamirad and Yulia Kharlan and Rodolfo Rodriguez and Igor Barsukov and Roman Verba},
url = {https://link.aps.org/doi/10.1103/PhysRevApplied.19.044087},
doi = {10.1103/PhysRevApplied.19.044087},
year = {2023},
date = {2023-04-27},
journal = {Phys. Rev. Appl.},
volume = {19},
pages = {044087},
publisher = {American Physical Society},
abstract = {Nanomagnets are the building blocks of many existing and emergent spintronic technologies. The magnetization dynamics of nanomagnets is often dominated by nonlinear processes, which have been recently shown to have many surprising features and far-reaching implications for applications. Here we develop a theoretical framework uncovering the selection rules for multimagnon processes and discuss their underlying mechanisms. For its technological relevance, we focus on the degenerate three-magnon process in thin elliptical nanodisks to illustrate our findings. We parameterize the selection rules through a set of magnon interaction coefficients which we calculate using micromagnetic simulations. We postulate the selection rules and investigate how they are altered by perturbations that break the symmetry of static magnetization configuration and spatial spin-wave profiles and that can be realized by applying off-symmetry-axis or nonuniform magnetic fields. Our work provides the phenomenological understanding of the mechanics of magnon interaction as well as the formalism for determining the interaction coefficients from simulations and experimental data. Our results serve as a guide to analyze the magnon processes inherently present in spin-torque devices in order to boost their performance or to engineer a specific nonlinear response in a nanomagnet used in a neuromorphic or quantum magnonic application.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}