Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator

Abstract

We report 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 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.

16 pages, 4 figures

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• Theory of magnon-driven spin Seebeck effect
• Spin convertance at magnetic interfaces
• Anti-damping spin transfer torque through epitaxial Nickel oxide
• Enhanced DC Spin Pumping into a Fluctuating Ferromagnet near Tc
• Enhancement of Pure Spin Currents in Spin Pumping Y3Fe5O12/Cu/metal Trilayers through Spin Conductance Matching

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