Investigation of spin-orbit torque efficiency in CuBi alloys,Physical Review B

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Investigation of spin-orbit torque efficiency in CuBi alloys
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-11 , DOI: 10.1103/physrevb.110.094419
Katsuhiro Tatsuoka ₁ , Motomi Aoki ₁ , Mitsuru Funato ₁ , Ryo Ohshima _{1,

1} , Yuichiro Ando _{1,

1,

2} , Masashi Shiraishi _{1,

1}

Affiliation

Experimental demonstration of substantially large and negative spin Hall angle in CuBi alloys, in which diluted Bi atoms are doped into Cu, sheds light on a novel aspect of spin-charge interconversion physics using Bi, where much effort has been paid to explore large spin-charge interconversion efficiency expected from the gigantic spin-orbit interaction of Bi. Since the spin Hall effect allows concomitant spin-orbit torque (SOT) that is a significant trait in spintronic phenomena for applications, an investigation of the spin-orbit torque efficiency in CuBi, that has not been thoroughly studied, is an important challenge. In this study, we estimate the SOT efficiency of CuBi by suppressing unwanted spin backflow. Surprisingly, the sign of the SOT efficiency is positive, unlike that in previous work. The amplitude of the SOT efficiency decreases monotonically as a function of the Bi composition of the CuBi alloy, which is attributed to the interplay of the orbital Hall effect of Cu and the interfacial Rashba effect in the SOT devices.

中文翻译：

CuBi 合金中自旋轨道扭矩效率的研究

CuBi 合金（其中稀释的 Bi 原子掺杂到 Cu 中）中具有相当大的负自旋霍尔角的实验演示，揭示了使用 Bi 的自旋电荷互变物理的新方面，其中人们付出了很大的努力来探索大自旋霍尔角。 Bi 巨大的自旋轨道相互作用预期电荷相互转换效率。由于自旋霍尔效应允许伴随自旋轨道扭矩（SOT），这是自旋电子现象应用中的一个重要特征，因此对 CuBi 中的自旋轨道扭矩效率的研究（尚未得到彻底研究）是一个重要的挑战。在这项研究中，我们通过抑制不需要的自旋回流来估计 CuBi 的 SOT 效率。令人惊讶的是，与之前的工作不同，SOT 效率的符号是正的。 SOT 效率的幅度随着 CuBi 合金 Bi 成分的变化而单调下降，这归因于 Cu 轨道霍尔效应和 SOT 器件中界面 Rashba 效应的相互作用。

更新日期：2024-09-11

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