Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 15: Poster I
MA 15.47: Poster
Dienstag, 18. März 2025, 10:00–12:30, P1
Simulation of magnetoelastic mode filters for surface acoustic waves — •Bernhard Emhofer1, Michael Karl Steinbauer1, Peter Flauger1, Matthias Volz3, Matthias Küß2, Stephan Glamsch2, Manfred Albrecht2, Hubert Krenner3, and Claas Abert1 — 1University of Vienna — 2University of Augsburg — 3University of Münster
Surface acoustic wave (SAW) propagation critically depends on the waveguide geometry, with a key challenge being the independent excitation of specific mode types such as Rayleigh and shear modes.
In this study, we employ micromagnetic simulations, specifically the python library magnum.np [1], to explore a novel approach for selectively absorbing specific acoustic modes via magnetoelastic coupling. This coupling occurs through the excitation of spin waves in a thin magnetic film, layered on top of the waveguide. To achieve controlled mode filtering, the equilibrium magnetization is manipulated by varying the angle and strength of an external magnetic field. The distinct resonance configurations for Rayleigh and shear modes observed experimentally [2], enable their selective attenuation.
Simulations performed for a LiNbO3 substrate with a 108 nm thick Ni film show that SAWs experience significant attenuation, with the maximum displacement at the surface reduced by around 70% after 13 wavelengths. These results demonstrate the potential of magnetoelastic interactions for precise mode filtering.
[1] F. Bruckner et al., Sci. Rep. 13, 12054 (2023).
[2] M. Küß et al., Phys. Rev. Appl. 15, 034046 (2021).
Keywords: Micromagnetism; Surface acoustic waves; Spin waves; Magnetoelastic coupling; Waveguides