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  • Title: Current-induced spin polarization on metal surfaces probed by spin-polarized positron beam.
    Author: Zhang HJ, Yamamoto S, Fukaya Y, Maekawa M, Li H, Kawasuso A, Seki T, Saitoh E, Takanashi K.
    Journal: Sci Rep; 2014 Apr 29; 4():4844. PubMed ID: 24776781.
    Abstract:
    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 10(5) A/cm(2)) 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.
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