微带天线激发自旋波的相位互易性
Phase reciprocity of spin-wave excitation by a microstrip antenna
摘要：
利用空间分辨、时间分辨和相位分辨的布里渊光散射光谱，我们研究了由同一个微波微带换能器激发的两个反向传播的自旋波的相位差。这些研究都进行后向体积静磁波和静磁表面波在面内磁化钇铁石榴石薄膜。实验表明，对于反向体静磁自旋波（它是互易的，并且在振幅上是对称的），在激发过程中存在$π$的相位差，从而相位对称性被扭曲。相反，对于静磁表面自旋波（其在振幅上是非互易和不对称的），保持相位对称性（与激发相关联的两个波之间没有相位差）。理论分析证实了这种效应。
英文摘要：
Using space-, time- and phase-resolved Brillouin light scattering spectroscopy we investigate the difference in phase of the two counterpropagating spin waves excited by the same microwave microstrip transducer. These studies are performed both for backward volume magnetostatic waves and magnetostatic surface waves in an in-plane magnetized yttrium iron garnet film. The experiments show that for the backward volume magnetostatic spin waves (which are reciprocal and excited symmetrically in amplitude) there is a phase difference of $π$ associated with the excitation process and thus the phase symmetry is distorted. On the contrary, for the magnetostatic surface spin waves (which are non-reciprocal and unsymmetrical in amplitude) the phase symmetry is preserved (there is no phase difference between the two waves associated with the excitation). Theoretical analysis confirms this effect.
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