后向自旋波在声波上散射的反向多普勒效应
Reverse Doppler effect in backward spin waves scattered on acoustic waves
摘要：
本文报道了声表面波反射后向自旋波的反向多普勒效应的观测结果。自旋波是在钇铁石榴石（YIG）薄膜中激发的。同时，声波也会产生。声波在磁致伸缩YIG薄膜中引起的应变导致薄膜中磁各向异性的周期性调制。因此，实际上，产生了用于自旋波的行进布拉格光栅。从这个光栅反射的反向自旋波表现出反向多普勒频移：当反射接近的声波时，频率向下而不是向上移动。类似地，当从后退的声波反射时，自旋波的频率向上移动。
英文摘要：
We report on the observation of reverse Doppler effect in backward spin waves reflected off of surface acoustic waves. The spin waves are excited in a yttrium iron garnet (YIG) film. Simultaneously, acoustic waves are also generated. The strain induced by the acoustic waves in the magnetostrictive YIG film results in the periodic modulation of the magnetic anisotropy in the film. Thus, in effect, a travelling Bragg grating for the spin waves is produced. The backward spin waves reflecting off of this grating exhibit a reverse Doppler shift: shifting down rather than up in frequency when reflecting off of an approaching acoustic wave. Similarly, the spin waves are shifted up in frequency when reflecting from receding acoustic waves.
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