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 , 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 interface for , , and metals. Calculations of spin current enhancement and spin mixing conductance are qualitatively consistent with the experimental results.
- Received 15 October 2015
DOI:https://doi.org/10.1103/PhysRevLett.116.186601
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