TY  - JOUR
AU  - Long, Nguyen Hoang
AU  - Mavropoulos, Phivos
AU  - Bauer, David
AU  - Zimmermann, Bernd
AU  - Mokrousov, Yuriy
AU  - Blügel, Stefan
TI  - Strong spin-orbit fields and Dyakonov-Perel spin dephasing in supported metallic films
JO  - Physical review / B
VL  - 94
IS  - 18
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2016-07419
SP  - 180406
PY  - 2016
AB  - Spin dephasing by the Dyakonov-Perel mechanism in metallic films deposited on insulating substrates is revealed, and quantitatively examined by means of density functional calculations combined with a kinetic equation. The surface-to-substrate asymmetry, probed by the metal wave functions in thin films, is found to produce strong spin-orbit fields and a fast Larmor precession, giving a dominant contribution to spin decay over the Elliott-Yafet spin relaxation up to a thickness of 70 nm. The spin dephasing is oscillatory in time with a rapid (subpicosecond) initial decay. However, parts of the Fermi surface act as spin traps, causing a persistent tail signal lasting 1000 times longer than the initial decay time. It is also found that the decay depends on the direction of the initial spin polarization, resulting in a spin-dephasing anisotropy of 200% in the examined cases.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000388465200002
DO  - DOI:10.1103/PhysRevB.94.180406
UR  - https://juser.fz-juelich.de/record/824918
ER  -