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Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam

机译:通过旋转偏振正电子束探测的金属表面上的电流诱导的自旋极化

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Current-induced spin polarization (CISP) on the outermost surfaces of Au, Cu, Pt, Pd, Ta, and W nanoscaled films were studied using a spin-polarized positron beam. The Au and Cu surfaces showed no significant CISP. In contrast, the Pt, Pd, Ta, and W films exhibited large CISP (3~15% per input charge current of 105?A/cm2) and the CISP of Ta and W were opposite to those of Pt and Pd. The sign of the CISP obeys the same rule in spin Hall effect suggesting that the spin-orbit coupling is mainly responsible for the CISP. The magnitude of the CISP is explained by the Rashba-Edelstein mechanism rather than the diffusive spin Hall effect. This settles a controversy, that which of these two mechanisms dominates the large CISP on metal surfaces.
机译:使用旋偏偏振正电子束研究了Au,Cu,Pt,Pd,Ta和W纳米薄膜的最外表面上的电流诱导的自旋极化(CISP)。 AU和Cu表面显示出没有明显的CISP。相反,Pt,pd,ta和w薄膜显示出大的cisp(每次输入充电电流为10 5 a / cm 2 )和TA和W的CISP与PT和PD的CISP相反。 CISP obeys的标志在Spin Hall效果中具有相同的规则,表明旋转轨道耦合主要负责CISP。 CISP的大小由Rashba-Edelstein机制来解释,而不是扩散旋转霍尔效应。这解决了争议,这两种机制中的哪一种在金属表面上占据大型CISP。

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