Nonreciprocal magnetoacoustic waves with out-of-plane phononic angular momenta

Author:

Liao Liyang1ORCID,Chen Fa2ORCID,Puebla Jorge3ORCID,Kishine Jun-ichiro45,Kondou Kouta3,Luo Wei2ORCID,Zhao Degang6,Zhang Yue2,Ba You3,Otani Yoshichika137ORCID

Affiliation:

1. Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.

2. School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China.

3. Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan.

4. The Open University of Japan, Chiba 261-0013, Japan.

5. Quantum Research Center for Chirality, Institute for Molecular Science, Aichi 444-8585, Japan.

6. School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.

7. Trans-scale Quantum Science Institute, University of Tokyo, Tokyo 113-8654, Japan.

Abstract

Surface acoustic wave (SAW) can carry phononic angular momentum, showing great potential as an energy-efficient way to control magnetism. Still, out-of-plane phononic angular momentum in SAW and its interaction with magnetism remain elusive. Here, we studied the SAW-induced magnetoacoustic waves and spin pumping in Ni-based films on LiNbO 3 with selected SAW propagation direction. The crystal inversion asymmetry induces circularly polarized phonons with large out-of-plane angular momenta so that up to 60% of the SAW power attenuates nonreciprocally controlled by the out-of-plane magnetization component. The SAW propagation direction dependence of the nonreciprocity verifies the crystal origin of the phononic angular momentum, and a chiral spin pumping demonstrates that the circular polarization can control the spin current generation efficiency. These results provide an additional degree of freedom for the acoustic control of magnetism and open an avenue for applying circularly polarized phonons.

Publisher

American Association for the Advancement of Science (AAAS)

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