Nonlocal Spin Diffusion Driven by Giant Spin Hall Effect at Oxide Heterointerfaces

Title
Nonlocal Spin Diffusion Driven by Giant Spin Hall Effect at Oxide Heterointerfaces
Authors
구현철민병철백승협김신익진미진문선영박정민Vijayakumar Modepalli조준현이현우유정우
Keywords
nonlocal spin diffusion; Oxide heterointerface; Rashba spin-orbit interaction; Spin Hall effect; spin?orbitronics
Issue Date
2017-01
Publisher
Nano letters
Citation
VOL 17, NO 1-43
Abstract
A two-dimensional electron gas emerged at a LaAlO3/SrTiO3 interface is an ideal system for “spin– orbitronics” as the structure itself strongly couple the spin and orbital degree of freedom through the Rashba spin– orbit interaction. One of core experiments toward this direction is the nonlocal spin transport measurement, which has remained elusive due to the low spin injection efficiency to this system. Here we bypass the problem by generating a spin current not through the spin injection from outside but instead through the inherent spin Hall effect and demonstrate the nonlocal spin transport. The analysis on the nonlocal spin voltage, confirmed by the signature of a Larmor spin precession and its length dependence, displays that both D’yakonov– Perel’ and Elliott– Yafet mechanisms involve in the spin relaxation at low temperature. Our results show that the oxide heterointerface is highly efficient in spin-charge conversion with exceptionally strong spin Hall coefficient γ ∼ 0.15 ± 0.05 and could be an outstanding platform for the study of coupled charge and spin transport phenomena and their electronic applications.
URI
http://pubs.kist.re.kr/handle/201004/66611
ISSN
1530-6984
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KIST Publication > Article
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