Disentanglement of bulk and interfacial spin Hall effect in ferromagnet/normal metal interface
Disentanglement of bulk and interfacial spin Hall effect in ferromagnet/normal metal interface
复制标题
铁磁体/普通金属界面中体相和界面自旋霍尔效应的解开
DOI：
10.1103/physrevb.94.144427
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发表时间：
2016-10
影响因子：
3.7
通讯作者：
Zhou S. M.
中科院分区：
文献类型：
--
作者：
Zhou X.;Tang M.;Fan X. L.;Qiu X. P.;Zhou S. M.
用自旋矩铁磁共振技术研究了PdPt合金与铁磁Ni_（80）Fe_（20）合金接触时的自旋霍尔效应。自旋力矩自旋霍尔角（ST-SHA）被证明是由界面和体SHAs。体SHA主要由斜散射，并达到最大值的最大随机化的Pt和Pd原子在中间合金组合物。特别是，界面SHA变得突出的富铂合金。这种现象表明界面处Rashba自旋轨道耦合增强，因为与Pd相比，Pt具有更强的自旋轨道耦合和更大的z势梯度。目前的工作突出了界面SHA，并提供了一种途径，以提高下一代自旋电子器件的功能和性能。
Spin Hall effect in PdPt alloys in contact with ferromagnetic Ni80Fe20 alloys has been studied by spin torque ferromagnetic resonance technique. The spin torque spin Hall angle (ST-SHA) proves to be contributed by the interfacial and bulk SHAs. The bulk SHA is dominated by the skew scattering and reaches a maximal value for the largest randomization of Pt and Pd atoms at the intermediate alloy composition. In particular, the interfacial SHA becomes prominent for Pt-rich alloys. This phenomenon indicates the enhanced Rashba spin-orbit coupling at the interface, as Pt has a stronger spin-orbit coupling and larger z-potential gradient compared to Pd. The present work highlights the interfacial SHA and provides a pathway to improve the functionality and performance of the next generation spintronic devices.