180-用相位分辨自旋波层析术观测磁弹性波的度相移
180-degree phase shift of magnetoelastic waves observed by phase-resolved spin-wave tomography
摘要：
利用相位分辨自旋波层析成像（PSWaT）研究了光激励磁弹性波。PSWaT通过使用自旋波传播的时间分辨磁光成像以及基于卷积定理和复傅立叶变换的分析来重建自旋波的色散关系及其相位信息。在掺Bi石榴石薄膜的PSWaT谱中，我们发现在自旋波和弹性波的色散关系的交叉点附近，磁弹性波发生了180度的相移。这一结果被解释为自旋波和弹性波之间通过磁弹性相互作用的耦合。我们还提出了一种有效的方法，通过旋转磁化方向小于10度的磁弹性波的相位操纵。
英文摘要：
We have investigated optically-excited magnetoelastic waves by phase-resolved spin-wave tomography (PSWaT). PSWaT reconstructs dispersion relation of spin waves together with their phase information by using time-resolved magneto-optical imaging for spin-wave propagation followed by an analysis based on the convolution theorem and a complex Fourier transform. In PSWaT spectra for a Bi-doped garnet film, we found a 180 degree phase shift of magnetoelastic waves at around the crossing of the dispersion relations of spin and elastic waves. The result is explained by a coupling between spin waves and elastic waves through magnetoelastic interaction. We also propose an efficient way for phase manipulation of magnetoelastic waves by rotating the orientation of magnetization less than 10 degree.
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