Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator

Weiwei Lin, Kai Chen, Shufeng Zhang, C. L. Chien

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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.

Original languageEnglish (US)
Article number186601
JournalPhysical review letters
Volume116
Issue number18
DOIs
StatePublished - May 5 2016

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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