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Nano Lett. 2017 Jan 11;17(1):36-43. doi: 10.1021/acs.nanolett.6b03050. Epub 2016 Dec 9.

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

Author information

1
School of Materials Science and Engineering-Low dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology , Ulsan, 44919, Korea.
2
Center for Electronic Materials, Korea Institute of Science and Technology , Seoul 02792, Korea.
3
Department of Nanomaterials Science and Technology, Korea University of Science and Technology , Daejeon, 34113, Korea.
4
Center for Spintronics, Korea Institute of Science and Technology , Seoul 02792, Korea.
5
KU-KIST Graduate School of Converging Science and Technology, Korea University , Seoul, 02481, Korea.
6
PCTP and Department of Physics, Pohang University of Science and Technology , Pohang 37673, Korea.

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.

KEYWORDS:

Oxide heterointerface; Rashba spin−orbit interaction; Spin Hall effect; nonlocal spin diffusion; spin−orbitronics

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