Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator

Weiwei Lin, Kai Chen, Shufeng Zhang, and C. L. Chien
Phys. Rev. Lett. 116, 186601 – Published 5 May 2016

Abstract

We report a large enhancement of thermally injected spin current in normal metal (NM)/antiferromagnet (AF)/yttrium iron garnet (YIG), where a thin AF insulating layer of NiO or CoO can enhance the spin current from YIG to a NM by up to a factor of 10. The spin current enhancement in NM/AF/YIG, with a pronounced maximum near the Néel temperature of the thin AF layer, has been found to scale linearly with the spin-mixing conductance at the NM/YIG interface for NM=3d, 4d, and 5d metals. Calculations of spin current enhancement and spin mixing conductance are qualitatively consistent with the experimental results.

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  • Received 15 October 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.186601

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Weiwei Lin1,*, Kai Chen2, Shufeng Zhang2, and C. L. Chien1,†

  • 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
  • 2Department of Physics, University of Arizona, Tucson, Arizona 85721, USA

  • *wlin@jhu.edu
  • clchien@jhu.edu

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Issue

Vol. 116, Iss. 18 — 6 May 2016

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