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Acoustic attenuation in magnetic insulator films: effects of magnon polaron formation

Shihao ZhuangJia-Mian Hu
Sep 2022
摘要
A magnon and a phonon are the quanta of spin wave and lattice wave,respectively, and they can hybridize into a magnon polaron when theirfrequencies and wavenumbers match close enough the values at the exceptionalpoint. Guided by an analytically calculated magnon polaron dispersion,dynamical phase-field simulations are performed to investigate the effects ofmagnon polaron formation on the attenuation of a bulk acoustic wave in amagnetic insulator film. It is shown that a stronger magnon-phonon couplingleads to a larger attenuation. The simulations also demonstrate the existenceof a minimum magnon-phonon interaction time required for the magnon polaronformation, which is found to decrease with the magnetoelastic couplingcoefficient but increase with the magnetic damping coefficient. These resultsdeepen the understanding of the mechanisms of acoustic attenuation in magneticcrystals and provide insights into the design of new-concept spin interconnectsthat operate based on acoustically driven magnon propagation.
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