Acoustic spin rotation in heavy-metal-ferromagnet bilayers

Yang Cao, Hao Ding, Yalu Zuo, Xiling Li, Yibing Zhao, Tong Li, Na Lei, Jiangwei Cao, Mingsu Si, Li Xi, Chenglong Jia, Desheng Xue () and Dezheng Yang ()
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Yang Cao: Lanzhou University
Hao Ding: Lanzhou University
Yalu Zuo: Lanzhou University
Xiling Li: Lanzhou University
Yibing Zhao: Lanzhou University
Tong Li: Lanzhou University
Na Lei: Beihang University
Jiangwei Cao: Lanzhou University
Mingsu Si: Lanzhou University
Li Xi: Lanzhou University
Chenglong Jia: Lanzhou University
Desheng Xue: Lanzhou University
Dezheng Yang: Lanzhou University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Through pumping a spin current from ferromagnet into heavy metal (HM) via magnetization precession, parts of the injected spins are in-plane rotated by the lattice vibration, namely acoustic spin rotation (ASR), which manifests itself as an inverse spin Hall voltage in HM with an additional 90° difference in angular dependency. When reversing the stacking order of bilayer with a counter-propagating spin current or using HMs with an opposite spin Hall angle, such ASR voltage shows the same sign, strongly suggesting that ASR changes the rotation direction due to interface spin-orbit interaction. With the drift-diffusion model of spin transport, we quantify the efficiency of ASR up to 30%. The finding of ASR endows the acoustic device with an ability to manipulate spin, and further reveals a new spin-orbit coupling between spin current and lattice vibration.

Date: 2024
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DOI: 10.1038/s41467-024-45317-9

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