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首页> 外文期刊>Physical review letters >Charge-to-Spin Conversion and Spin Diffusion in Bi/Ag Bilayers Observed by Spin-Polarized Positron Beam
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Charge-to-Spin Conversion and Spin Diffusion in Bi/Ag Bilayers Observed by Spin-Polarized Positron Beam

机译:自旋极化正电子束观察到的Bi / Ag双层中的电荷到自旋转换和自旋扩散

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摘要

Charge-to-spin conversion induced by the Rashba-Edelstein effect was directly observed for the first time in samples with no magnetic layer. A spin-polarized positron beam was used to probe the spin polarization of the outermost surface electrons of Bi/Ag/Al2O3 and Ag/Bi/Al2O3 when charge currents were only associated with the Ag layers. An opposite surface spin polarization was found between Bi/Ag/Al2O3 and Ag/Bi/Al2O3 samples with the application of a charge current in the same direction. The surface spin polarizations of both systems decreased exponentially with the outermost layer thickness, suggesting the occurrence of spin diffusion from the Bi/Ag interface to the outermost surfaces. This work provides a new technique to measure spin diffusion length.
机译:在没有磁性层的样品中,首次直接观察到由Rashba-Edelstein效应引起的电荷到自旋转换。当电荷电流仅与Ag层相关时,使用自旋极化的正电子束探测Bi / Ag / Al2O3和Ag / Bi / Al2O3的最外表面电子的自旋极化。通过在相同方向上施加充电电流,在Bi / Ag / Al2O3和Ag / Bi / Al2O3样品之间发现了相反的表面自旋极化。两个系统的表面自旋极化都随着最外层厚度的增加而呈指数下降,这表明自Bi / Ag界面到最外层表面发生了自旋扩散。这项工作提供了一种测量自旋扩散长度的新技术。

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  • 来源
    《Physical review letters》 |2015年第16期|166602.1-166602.5|共5页
  • 作者单位

    Japan Atom Energy Agcy, Adv Sci Res Ctr, Takasaki, Gunma 3701292, Japan;

    Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Takasaki, Gunma 3701292, Japan;

    Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan;

    Japan Atom Energy Agcy, Adv Sci Res Ctr, Takasaki, Gunma 3701292, Japan;

    Japan Atom Energy Agcy, Adv Sci Res Ctr, Takasaki, Gunma 3701292, Japan;

    Japan Atom Energy Agcy, Adv Sci Res Ctr, Takasaki, Gunma 3701292, Japan;

    Japan Atom Energy Agcy, Adv Sci Res Ctr, Takasaki, Gunma 3701292, Japan;

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