TY - JOUR
T1 - Nonreciprocal Spin Current Generation in Surface-Oxidized Copper Films
AU - Okano, Genki
AU - Matsuo, Mamoru
AU - Ohnuma, Yuichi
AU - Maekawa, Sadamichi
AU - Nozaki, Yukio
N1 - Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/5/29
Y1 - 2019/5/29
N2 - We experimentally demonstrate the nonreciprocal generation of spin current (Js) in a surface-oxidized copper film. The efficiency of conversion is at least 320 times larger than the inverse conversion. This nonreciprocity is due to a novel type of Js generation, which relies on the transfer of angular momentum from the velocity field of free electrons. A gradient in the electrical mobility in the film produces vorticity in the in-plane drift velocity of the free electrons. The inverse process can hardly occur when Js is collinear with the gradient in the electrical mobility.
AB - We experimentally demonstrate the nonreciprocal generation of spin current (Js) in a surface-oxidized copper film. The efficiency of conversion is at least 320 times larger than the inverse conversion. This nonreciprocity is due to a novel type of Js generation, which relies on the transfer of angular momentum from the velocity field of free electrons. A gradient in the electrical mobility in the film produces vorticity in the in-plane drift velocity of the free electrons. The inverse process can hardly occur when Js is collinear with the gradient in the electrical mobility.
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U2 - 10.1103/PhysRevLett.122.217701
DO - 10.1103/PhysRevLett.122.217701
M3 - Article
C2 - 31283329
AN - SCOPUS:85066444368
SN - 0031-9007
VL - 122
JO - Physical Review Letters
JF - Physical Review Letters
IS - 21
M1 - 217701
ER -