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arXiv 1809.06145cond-mat.mtrl-scicond-mat.mes-hall
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非磁性材料中利用自旋-轨道耦合研究自旋-电荷相互转换的十字形纳米结构

Cross-shaped nanostructures for the study of spin to charge interconversions using spin-orbit coupling in non-magnetic materials

V. T. Pham, L. Vila, G. Zahnd, P. Noël, A. Marty, J. P. Attané

摘要:

几种自旋-轨道效应允许执行自旋到电荷的相互转换:自旋霍尔效应、拉什巴效应或拓扑绝缘体中的自旋-动量锁定。在这里,我们专注于如何使用三种不同的十字形纳米结构来检测这种相互转换。我们将这些测量配置应用于Pt中的自旋霍尔效应的情况,使用CoFe电极来检测和注入自旋。直接和逆自旋霍尔效应都可以被检测到,自旋霍尔信号比金属横向自旋阀中的非局域测量高两个数量级,并且具有简单得多的制造协议。我们比较各自的信号幅度的三个建议的几何形状。最后,比较所观察到的自旋信号与有限元方法计算允许提取自旋霍尔角和自旋扩散长度的Pt。

英文摘要:

Several spin-orbit effects allow performing spin to charge inter-conversion: the spin Hall effects, the Rashba effect, or the spin-momentum locking in topological insulators. Here we focus on how the detection of this inter-conversion can be made electrically, using three different cross-shaped nanostructures. We apply these measurement configurations to the case of the spin Hall effect in Pt, using CoFe electrodes to detect and inject spins. Both the direct and inverse spin Hall effect can be detected, with a spin Hall signal up to two order of magnitude higher than that of nonlocal measurements in metallic lateral spin valves, and with a much simpler fabrication protocol. We compare the respective signal amplitude of the three proposed geometries. Finally, comparison of the observed spin signals with finite element method calculations allows extracting the spin Hall angle and the spin diffusion length of Pt.

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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