Anisotropic spin relaxation induced by surface spin-orbit effects
Anisotropic spin relaxation induced by surface spin-orbit effects
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表面自旋轨道效应引起的各向异性自旋弛豫
DOI：
10.1103/physrevb.96.094413
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发表时间：
2017-09
影响因子：
3.7
通讯作者：
Ji Yi
中科院分区：
文献类型：
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作者：
Zhou Chao;K;az Fatih;Cai Yunjiao;Qin Chuan;Jia Mengwen;Yuan Zhe;Wu Yizheng;Ji Yi
自旋电流在多晶金属中的输运是各向同性的，与极化方向无关，尽管自旋电流是一个类张量，其极化方向是一个关键变量。我们在非局域自旋阀中证明了介观多晶Cu通道中令人惊讶的各向异性自旋弛豫。在衬底平面的方向上，平行于Cu通道的自旋弛豫长度比垂直于Cu通道的自旋弛豫长度长，在10 K时可长9%。铜通道表面的自旋轨道效应可以解释这种各向异性自旋弛豫。这一发现表明，自旋电流不仅可以通过其极化方向调节，而且可以通过静电门控调节。
It is a common perception that the transport of a spin current in polycrystalline metal is isotropic and independent of the polarization direction, even though spin current is a tensorlike quantity and its polarization direction is a key variable. We demonstrate surprising anisotropic spin relaxation in mesoscopic polycrystalline Cu channels in nonlocal spin valves. For directions in the substrate plane, the spin-relaxation length is longer for spins parallel to the Cu channel than for spins perpendicular to it, by as much as 9% at 10 K. Spin-orbit effects on the surfaces of Cu channels can account for this anisotropic spin relaxation. The finding suggests novel tunability of spin current, not only by its polarization direction but also by electrostatic gating.
影响因子：
64.8
作者：
通讯作者：
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