Nonlocal spin diffusion driven by giant spin hall effect at oxide heterointerfaces

Mi Jin Jin, Seon Young Moon, Jungmin Park, Vijayakumar Modepalli, Junhyeon Jo, Shin Ik Kim, Hyun Cheol Koo, Byoung Chul Min, Hyun Woo Lee, Seung Hyub Baek, Jung Woo Yoo

Research output: Contribution to journalArticle

18 Citations (Scopus)

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 λ ∼ 0.15 ± 0.05 and could be an outstanding platform for the study of coupled charge and spin transport phenomena and their electronic applications.

Original languageEnglish
Pages (from-to)36-43
Number of pages8
JournalNano Letters
Volume17
Issue number1
DOIs
Publication statusPublished - 2017

Keywords

  • Nonlocal spin diffusion
  • Oxide heterointerface
  • Rashba spin-orbit interaction
  • Spin Hall effect
  • Spin-orbitronics

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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  • Cite this

    Jin, M. J., Moon, S. Y., Park, J., Modepalli, V., Jo, J., Kim, S. I., Koo, H. C., Min, B. C., Lee, H. W., Baek, S. H., & Yoo, J. W. (2017). Nonlocal spin diffusion driven by giant spin hall effect at oxide heterointerfaces. Nano Letters, 17(1), 36-43. https://doi.org/10.1021/acs.nanolett.6b03050