arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.07186cond-mat.mes-hall
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表面自旋轨道效应引起的各向异性自旋弛豫

Anisotropic Spin Relaxation Induced by Surface Spin-Orbit Effects

Chao Zhou, Fatih Kandaz, Yunjiao Cai, Chuan Qin, Mengwen Jia, Zhe Yuan, Yizheng Wu, Yi Ji

摘要:

尽管自旋电流是一个类张量,其极化方向是一个关键变量,但人们普遍认为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。我们展示了令人惊讶的各向异性自旋弛豫介观多晶铜通道在非局部自旋阀。对于衬底平面中的方向,自旋弛豫长度对于平行于Cu沟道的自旋比对于垂直于Cu沟道的自旋长,在10 K下高达9%。铜通道表面的自旋轨道效应可以解释这种各向异性的自旋弛豫。这一发现表明新的自旋电流的可调谐性,不仅通过其极化方向,而且通过静电门控。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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