Nonlocal Spin Diffusion Driven by Giant Spin Hall Effect at Oxide Heterointerfaces
- Nonlocal Spin Diffusion Driven by Giant Spin Hall Effect at Oxide Heterointerfaces
- 구현철; 민병철; 백승협; 김신익; 진미진; 문선영; 박정민; Vijayakumar Modepalli; 조준현; 이현우; 유정우
- nonlocal spin diffusion; Oxide heterointerface; Rashba spin-orbit interaction; Spin Hall effect; spin?orbitronics
- Issue Date
- Nano letters
- VOL 17, NO 1-43
- 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.
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