Spin Pumping and Spin-Transfer Torques in Antiferromagnets

Ran Cheng, Jiang Xiao, Qian Niu, and Arne Brataas
Phys. Rev. Lett. 113, 057601 – Published 29 July 2014

Abstract

Spin pumping and spin-transfer torques are two reciprocal phenomena widely studied in ferromagnetic materials. However, pumping from antiferromagnets and its relation to current-induced torques have not been explored. By calculating how electrons scatter off a normal metal-antiferromagnetic interface, we derive pumped spin and staggered spin currents in terms of the staggered field, the magnetization, and their rates of change. For both compensated and uncompensated interfaces, spin pumping is of a similar magnitude as in ferromagnets with a direction controlled by the polarization of the driving microwave. The pumped currents are connected to current-induced torques via Onsager reciprocity relations.

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  • Received 23 April 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.057601

© 2014 American Physical Society

Authors & Affiliations

Ran Cheng1,*, Jiang Xiao2,†, Qian Niu1,3, and Arne Brataas4

  • 1Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
  • 2Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China
  • 3International Center for Quantum Materials, and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
  • 4Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway

  • *rancheng@utexas.edu
  • xiaojiang@fudan.edu.cn

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Issue

Vol. 113, Iss. 5 — 1 August 2014

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