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MA: Fachverband Magnetismus
MA 29: Skyrmions II
MA 29.14: Vortrag
Mittwoch, 19. März 2025, 18:30–18:45, H20
Hybrid magnonic crystal based on skyrmions — •Krzysztof Szulc1,2, Mateusz Zelent2, and Maciej Krawczyk2 — 1Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland — 2ISQI, Faculty of Physics and Astronomy, Adam Mickiewicz University, Poznań, Poland
We study a hybrid magnonic crystal consisting of a Py waveguide over which the periodic chain of Co/Pt dots is placed [K. Szulc et al. arXiv:2404.10493]. In the dots, the Dzyaloshinskii-Moriya interaction is present, thus it is possible to stabilize the single-domain state and the skyrmion state. We show that the dispersion relation changes with the change of the magnetization configuration of the dot. The sizes of bandgaps significantly differ in these systems. Due to different character of excitation of the both states, the system with skyrmions in dots can interact with the waveguide at lower frequencies or even be excited below the frequencies of the waveguide. Furthermore, I show that one part of the skyrmion modes hybridize with the waveguide modes, sometimes inducing additional band gaps in the spectrum, while the second part does not interact, forming bound states. Such a system of waveguide coupled to the chain of dots forms a reconfigurable spin-wave platform which can be used in spin-wave filtering and artificial neural networks.
This work was supported by the National Science Centre, Poland, grant no. UMO-2021/41/N/ST3/04478 and EU Research and Innovation Programme Horizon Europe (HORIZON-CL4-2021-DIGITAL-EMERGING-01) under grant agreement no. 101070347 (MANNGA).
Keywords: spin waves; skyrmions; magnonic crystal; dipolar coupling