Charge-to-Spin Conversion and Spin Diffusion in Bi/Ag Bilayers Observed by Spin-Polarized Positron Beam | Zendy

Hongjun Zhang | Zendy; S. Yamamoto | Zendy; Bo Gu | Zendy; H. Li | Zendy; M. Maekawa | Zendy; Y. Fukaya | Zendy; A. Kawasuso | Zendy

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Charge-to-Spin Conversion and Spin Diffusion in Bi/Ag Bilayers Observed by Spin-Polarized Positron Beam

Author(s) -

Hongjun Zhang,

S. Yamamoto,

Bo Gu,

H. Li,

M. Maekawa,

Y. Fukaya,

A. Kawasuso

Publication year - 2015

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.114.166602

Subject(s) - spin diffusion , condensed matter physics , spin polarization , spin (aerodynamics) , physics , electron , charge (physics) , atomic physics , materials science , nuclear physics , ferromagnetism , thermodynamics , quantum mechanics

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.

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