Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 45: Computational Magnetism
MA 45.7: Vortrag
Freitag, 21. März 2025, 11:15–11:30, H18
Programmable Magnetophononics: Selective Damping of Surface Acoustic Waves — •Michael Karl Steinbauer1, Peter Flauger1, Bernhard Emhofer1, Matthias Küß2, Stephan Glamsch2, Manfred Albrecht2, and Claas Abert1 — 1University of Vienna — 2University of Augsburg
Surface acoustic wave (SAW) bandpass filters are an indispensable part of modern telecommunications infrastructure [1]. Spin waves (SWs) can be excited by SAWs in radio-frequency bands, making their coupling a topic of current scientific interest [2].
In this work, we utilize this magnon-phonon interaction to demonstrate the theoretical viability of a novel device composed of exchange-decoupled magnetic islets on a piezoelectric substrate. Depending on the magnetic orientation of neighboring islets, a shift in the dispersion relation of the SW is predicted to occur due to their stray field interaction. This shift increases or decreases the efficiency with which the SAW can excite the SWs, leading to a difference in the amount of energy the magnetic system absorbs. For certain geometries, a gap in the SAW power after traversing the device of 10 dB/mm or more is predicted to occur.
For this study, a new algorithm for efficiently calculating SAW attenuation under the assumption of a continuous signal was developed for the micromagnetic simulation library magnum.np [3].
[1] P. Delsing et al., J. Phys. D: Appl. Phys. 52, 353001 (2019).
[2] M. Küß et al., Phys. Rev. Appl. 15, 034046 (2021).
[3] F. Bruckner et al., Sci. Rep. 13, 12054 (2023).
Keywords: Computational Micromagnetics; Surface Acoustic Waves; Spin Waves; Magnetoacoustics; Magnetoelasticity