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

详细信息    查看全文

• 作者：Mi-Jin Jin ; Seon Young Moon ; Jungmin Park ; Vijayakumar Modepalli ; Junhyeon Jo ; Shin-Ik Kim ; Hyun Cheol KooByoung-Chul Min ; Hyun-Woo LeeSeung-Hyub Baek ; Jung-Woo Yoo
• 刊名：Nano Letters
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：17
• 期：1
• 页码：36-43
• 全文大小：533K
• ISSN：1530-6992

文摘

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.