论文标题
磁性绝缘子膜中的声学衰减：镁质极化的效果
Acoustic attenuation in magnetic insulator films: effects of magnon polaron formation
论文作者
论文摘要
磁子和声子分别是自旋波和晶格波的量子，当它们的频率和波数匹配时，它们可以杂交成镁极化子，在特殊点处的值足够接近。在分析计算的木颗极化子分散体的指导下，进行了动态相位模拟，以研究磁极形成对磁性绝缘体膜中块状声波衰减的影响。结果表明，较强的磁成功耦合会导致更大的衰减。该模拟还证明了镁极化物形成所需的最小镁 - 光子相互作用时间，发现随着磁弹性耦合系数的减小，但随着磁性阻尼系数的增加而减小。这些结果加深了对磁晶体中声学衰减机制的理解，并为基于声学驱动的镁繁殖而运行的新概念旋转互连的设计提供了见解。
A magnon and a phonon are the quanta of spin wave and lattice wave, respectively, and they can hybridize into a magnon polaron when their frequencies and wavenumbers match close enough the values at the exceptional point. Guided by an analytically calculated magnon polaron dispersion, dynamical phase-field simulations are performed to investigate the effects of magnon polaron formation on the attenuation of a bulk acoustic wave in a magnetic insulator film. It is shown that a stronger magnon-phonon coupling leads to a larger attenuation. The simulations also demonstrate the existence of a minimum magnon-phonon interaction time required for the magnon polaron formation, which is found to decrease with the magnetoelastic coupling coefficient but increase with the magnetic damping coefficient. These results deepen the understanding of the mechanisms of acoustic attenuation in magnetic crystals and provide insights into the design of new-concept spin interconnects that operate based on acoustically driven magnon propagation.
