Breakdown of the Sharvin limit in spin pumping with interfacial Rashba spin-orbit coupling

Ka Shen, Lei Wang, and Ke Xia
Phys. Rev. B 99, 045421 – Published 17 January 2019

Abstract

We theoretically investigate the role of the interfacial Rashba spin-orbit coupling in spin pumping based on a nonperturbative calculation. A nonmonotonic behavior is predicted in the Rashba-strength dependence of the Gilbert damping coefficients. We show that the in-plane damping component can exceed the Sharvin limit thanks to the Rashba-field-induced torque. Nevertheless, the pumped spin current remains below the Sharvin limit and satisfies the Onsager reciprocity relations with the spin-current-induced spin-transfer torque.

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  • Received 17 October 2018
  • Revised 11 December 2018

DOI:https://doi.org/10.1103/PhysRevB.99.045421

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Ka Shen1,*, Lei Wang2, and Ke Xia1,3,4

  • 1Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China
  • 2Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, No. 28 Xianning West Road Xi'an, Shaanxi 710049, China
  • 3Shenzhen Institute for Quantum Science and Engineering, and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
  • 4Center for Quantum Computing, Peng Cheng Laboratory, Shenzhen 518005, China

  • *kashen@bnu.edu.cn

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Vol. 99, Iss. 4 — 15 January 2019

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