Nonreciprocal phonon propagation via spatially asymmetric magnon-phonon coupling

作者：Hiroyuki Moriya, Motoki Asano, Daiki Hatanaka, Yoshitaka Taniyasu, Hajime Okamoto, Hiroshi Yamaguchi · 发表于：arXiv (Cornell University) · 年份：2026 · 研究领域：Mechanical and Optical Resonators、Acoustic Wave Resonator Technologies、Magnetic properties of thin films

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.