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arXiv · 1903.07223

Theory of spin transport through antiferromagnetic insulator

Gen Tatara·Christian Ortiz Pauyac
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Abstract

A theoretical formulation for spin transport through an antiferromagnetic (AF) insulator is presented in the case driven/detected by direct/inverse spin Hall effect in two heavy metal contacts. The spin signal is shown to be transferred by the ferromagnetic correlation function of the antiferromagnet, which is calculated based on a magnon representation. To cover high temperature regimes, we include an auxiliary field representing short AF correlations and a temperature-dependent damping due to magnon scattering. The diffusion length for spin is long close to the degeneracy of the two AF magnons, and has a maximum as function of temperature near the Néel transition.

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Gen Tatara, Christian Ortiz Pauyac. 2019-03-18. Theory of spin transport through antiferromagnetic insulator. https://doi.org/10.1103/physrevb.99.180405

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