Spin-charge-coupled transverse resistance in an ambipolar conductor YH2-based Hall-bar structure with perpendicularly magnetized current-injection electrodes
Spin-charge-coupled transverse resistance in an ambipolar conductor YH2-based Hall-bar structure with perpendicularly magnetized current-injection electrodes
复制标题
具有垂直磁化电流注入电极的双极性导体 YH2 霍尔棒结构中的自旋电荷耦合横向电阻
DOI：
10.1088/1402-4896/acc4f2
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发表时间：
2023
期刊：
影响因子：
2.9
通讯作者：
S. Hasegawa and M. Sakai
中科院分区：
文献类型：
--
作者：
K. Sato;Y. Takahashi;S.Akisato;R. Mikami;N. Suganuma;Y. Ashizawa;H. Kawaguchi;Y. Nakajima;T. Ukai;Y. Fuji;T. Hanajiri;J. Kaneko;O. Nakamura;P. V. Thach;H. Awano;S. Hasegawa and M. Sakai
自旋-电荷（SC）耦合在自旋电子学中是至关重要的，并且耦合机制可以被分类为通过自旋-轨道相互作用（SOI）的体特性或由磁性和磁性导体形成的结提供的界面特性。这两种类型的SC耦合占横向电阻（TR）在平面通道进行面外极化自旋电流注入。这是因为界面自旋累积诱导自旋角动量的扩散输运，其通过SOI转换成横向电荷累积。我们探讨的SC耦合特性的横向结组成的（i）稀土过渡金属（RE-TM）亚铁磁体与垂直磁各向异性和（ii）的补偿金属，YH 2，其中电子和空穴同时参与自旋和电荷输运。这种设置允许我们观察TR，其反映了在平面霍尔条结构中用作电流源电极的RE-TM的磁化。结果表明，逆自旋霍尔效应对TR有显著的贡献。沿着TR测量，我们制定了一个最小的表达式TR时，面外极化的电子和空穴自旋电流注入的磁性电极。由于该公式不依赖于SC耦合机制的细节，因此可用于解释观测结果，以揭示RE-TM和YH 2装置的SC耦合特征。
Spin-charge (SC) coupling is crucial in spintronics and the coupling mechanisms can be classified into bulk characteristic via spin-orbit interaction (SOI) or the interfacial characteristic provided by a junction formed by magnetic and nonmagnetic conductors. The two types of SC couplings account for the transverse resistance (TR) in a planer channel subjected to out-of-plane-polarized spin current injection. This is because interfacial spin-accumulation induces the diffusive transport of spin-angular momentum, which is converted into transverse charge accumulation via SOI. We explore the SC coupling characteristics of a lateral junction consisting of (i) a rare-earth transition metal (RE-TM) ferrimagnet with perpendicular magnetic anisotropy and (ii) a compensated metal, YH 2, where electrons and holes simultaneously participate in spin and charge transports. This set-up allows us to observe the TR, which mirrors the magnetization of the RE-TM employed as the current-source electrode in the planer Hall-bar structure. The results show that the inverse spin Hall effect contributes significantly to the TR. Along with the TR measurement, we formulate a minimal expression of the TR when out-of-plane-polarized electron and hole spin currents are injected from the magnetic electrode. Since this formulation is independent of the details of the SC coupling mechanism, it is applied to interpret the observation result to reveal the SC coupling characteristics of the RE-TM and YH 2 set-up.