Generation and Detection of Pure Spin Current in an H-Shaped Structure of a Single Metal

Caigan Chen, Dai Tian, Hexin Zhou, Dazhi Hou, and Xiaofeng Jin
Phys. Rev. Lett. 122, 016804 – Published 9 January 2019
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Abstract

Distinct from all the existing methods for determining the spin Hall angle with bilayers, we have developed a new approach based on the mesoscopic H-shaped structure, which generates and detects pure spin current in a single metal. Using this approach we have unequivocally addressed the long-standing controversy of the magnitude of the spin Hall angle of gold. By exploiting the long spin diffusion length of Cu and the large spin-orbit coupling of Bi, we have realized a very large spin Hall effect in 10 nm Cu films delta doped with 0.15 nm of Bi. This new artificial material can generate a large spin-orbit torque to switch an adjacent Fe layer. We have thus demonstrated new artificial materials with a simultaneously large spin Hall angle and long spin diffusion length.

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  • Received 28 June 2018
  • Revised 19 November 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.016804

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Caigan Chen1,2,*, Dai Tian1,2,*, Hexin Zhou1,2, Dazhi Hou3, and Xiaofeng Jin1,2,†

  • 1Department of Physics, State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China
  • 2Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China
  • 3WPI Advanced Institute of Materials Research, Tohoku University, Sendai 980-8577, Japan

  • *These two authors contributed equally.
  • Corresponding author. xfjin@fudan.edu.cn

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Issue

Vol. 122, Iss. 1 — 11 January 2019

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