Frequency and wavenumber selective excitation of spin waves through coherent energy transfer from elastic waves
Frequency and wavenumber selective excitation of spin waves through coherent energy transfer from elastic waves
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DOI：
10.1103/physrevb.97.140404
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发表时间：
2018-04-27
影响因子：
3.7
通讯作者：
Rasing, Theo
中科院分区：
文献类型：
--
作者：
Hashimoto, Yusuke;Bossini, Davide;Rasing, Theo
利用自旋波层析成像（SWaT），我们研究了光激发磁弹性波的激发和传播动力学，即，自旋波和弹性波的混合模式，在石榴石薄膜。通过时间分辨SWaT，我们揭示了磁弹性波的激发动力学，通过光激发的纯弹性波和自旋波之间的相干能量转移，通过磁弹性耦合。该过程在自旋波和弹性波的色散关系的交叉处实现自旋波的频率和波数选择性激发。最后，我们证明了光激发的纯弹性波的激发机制，这是所观察到的磁弹性波的源，是耗散的性质。
Using spin-wave tomography (SWaT), we have investigated the excitation and the propagation dynamics of optically excited magnetoelastic waves, i.e., hybridized modes of spin waves and elastic waves, in a garnet film. By using time-resolved SWaT, we reveal the excitation dynamics of magnetoelastic waves through coherent-energy transfer between optically excited pure-elastic waves and spin waves via magnetoelastic coupling. This process realizes frequency and wavenumber selective excitation of spin waves at the crossing of the dispersion relations of spin waves and elastic waves. Finally, we demonstrate that the excitation mechanism of the optically excited pure-elastic waves, which are the source of the observed magnetoelastic waves, is dissipative in nature.