AI 中文总结
研究基于磁振子-声子耦合空间不对称性实现表面声波非互易传播，通过薄压电薄膜下厚磁性层及偶极-偶极相互作用，使磁振子模式依SAW传播方向而定，实现明显单向传播，非互易性达最高水平，建立新策略。
AI 中文摘要
基于磁振子-声子耦合的空间不对称性，演示了表面声波（SAW）的非互易传播。这种非互易性由在薄压电薄膜下形成的声学波长尺度厚的磁性层实现。在此配置中，由偶极-偶极相互作用激活的磁振子模式根据SAW的传播方向位于顶部或底部界面附近。结果，界面磁振子与表面声子模式之间的空间重叠预计将与方向相关，从而导致SAW明显的单向传播。值得注意的是，在基于单个磁性层的SAW器件中，由此产生的非互易性达到了报道的最高水平。这一发现将在结构简单的磁机械设备中建立一种非互易声传播的新策略。
英文摘要
Nonreciprocal propagation of surface acoustic waves (SAWs) based on the spatial asymmetry of magnon-phonon coupling is demonstrated. This nonreciprocity is enabled by an acoustic wavelength scale thick magnetic layer formed under a thin piezoelectric film. In this configuration, magnon modes activated by dipole-dipole interactions are localized near either the top or bottom interface depending on the propagation direction of the SAW. As a result, the spatial overlap between interfacial magnon and surface phonon modes is expected to become direction dependent, in a manner that leads to distinct unidirectional propagation of SAWs. Notably, the resulting nonreciprocity reaches the highest level among those reported for SAW devices based on a single magnetic layer. This finding will establish a new strategy of nonreciprocal acoustic propagation in a structurally simple magnomechanical device.
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