Nonreciprocally Boosting Magnetoacoustic Coupling with Surface-Acoustic-Wave-induced Spin Transfer Torque

Shuting Cui; Fa Chen; Liyang Liao; Jiacheng Lu; Rui Xiong; Xiaofei Yang; Yoshichika Otani; Yue Zhang; Wei Luo

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arXiv · 2412.13831

Nonreciprocally Boosting Magnetoacoustic Coupling with Surface-Acoustic-Wave-induced Spin Transfer Torque

Shuting Cui·Fa Chen·Liyang Liao·Jiacheng Lu·Rui Xiong·Xiaofei Yang·Yoshichika Otani·Yue Zhang·Wei Luo

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Abstract

Strengthening magnetoacoustic coupling is crucial to the improvement of the surface acoustic wave (SAW)-driven spintronics devices. A key challenge in enhancing magnetoacoustic coupling is minimizing the phonon and magnon dissipation of the device, which usually requires complicated techniques for generating shear-horizontal (SH) or standing waves to suppress the phonon dissipation. In this work, we significantly strengthened the magnetoacoustic coupling by suppressing the magnon dissipation via the SAW-induced spin-transfer-torque (STT) in Co/Cu/NiFe multilayer, which is facilitated by the non-parallel magnetization alignment between the two ferromagnetic layers. Also, this STT exhibits the form of Zhang-Li torque due to the SAW-induced spin wave, which gives rise to the unique nonreciprocal SAW transportation under external magnetic field. This finding opens new avenues for non-reciprocally boosting magnetoacoustic coupling, which pays the way for developing on-chip SAW-driven multifunctional devices.

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Shuting Cui, Fa Chen, Liyang Liao, Jiacheng Lu, Rui Xiong, Xiaofei Yang, Yoshichika Otani, Yue Zhang, Wei Luo. 2024-12-18. Nonreciprocally Boosting Magnetoacoustic Coupling with Surface-Acoustic-Wave-induced Spin Transfer Torque. https://arxiv.org/abs/2412.13831

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