Spin Pumping in the Presence of Spin-Orbit Coupling
Spin Pumping in the Presence of Spin-Orbit Coupling
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DOI：
10.1103/physrevlett.114.126602
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发表时间：
2015-03-26
影响因子：
8.6
通讯作者：
Zhang, Shufeng
中科院分区：
文献类型：
--
作者：
Chen, Kai;Zhang, Shufeng
近年来在重金属和拓扑绝缘体中观察到自旋抽运和相关现象，其中自旋轨道耦合起着重要作用。我们开发了一个自旋抽运的形式，明确地包括了界面处的自旋轨道耦合和层内的无序。通过自旋-轨道耦合界面的自旋抽运和随之而来的回流被同等对待。我们解决了一些长期存在的关于Pt的自旋扩散长度的矛盾结论，以及与重金属界面的自旋记忆损失的起源。此外，我们还预测了一些迄今未预料到的自旋泵浦现象。
Spin pumping and related phenomena have been observed recently in heavy metals and topological insulators, where the spin-orbit coupling plays an essential role. We have developed a spin-pumping formalism that explicitly includes the spin-orbit coupling at interfaces and disorder in the layers. Spin pumping across an interface with spin-orbit coupling and the attendant backflow are treated on an equal footing. We resolve some long-standing issues on the conflicting conclusions about the spin-diffusion length for Pt, and the origin of spin-memory loss at interfaces with heavy metals. In addition, we predict some heretofore unanticipated spin-pumping phenomena.