Superfluid spin transport through antiferromagnetic insulators

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Superfluid spin transport through antiferromagnetic insulators

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Title: Superfluid spin transport through antiferromagnetic insulators
Author: Takei, So; Halperin, Bertrand I.; Yacoby, Amir; Tserkovnyak, Yaroslav

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Citation: Takei, So, Bertrand I. Halperin, Amir Yacoby, and Yaroslav Tserkovnyak. 2014. “Superfluid Spin Transport through Antiferromagnetic Insulators.” Phys. Rev. B 90 (9) (September). doi:10.1103/physrevb.90.094408.
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Abstract: A theoretical proposal for realizing and detecting spin supercurrent in an isotropic antiferromagnetic insulator is reported. Superfluid spin transport is achieved by inserting the antiferromagnet between two metallic reservoirs and establishing a spin accumulation in one reservoir such that a spin bias is applied across the magnet. We consider a class of bipartite antiferromagnets with Néel ground states, and temperatures well below the ordering temperature, where spin transport is mediated essentially by the condensate. Landau-Lifshitz and magnetocircuit theories are used to directly relate spin current in different parts of the heterostructure to the spin-mixing conductances characterizing the antiferromagnet∣∣metal interfaces and the antiferromagnet bulk damping parameters, quantities all obtainable from experiments. We study the efficiency of spin angular-momentum transfer at an antiferromagnet∣∣metal interface by developing a microscopic scattering theory for the interface and extracting the spin-mixing conductance for a simple model. Within the model, a quantitative comparison between the spin-mixing conductances obtained for the antiferromagnet∣∣metal and ferromagnet∣∣metal interfaces is made.
Published Version: doi:10.1103/physrevb.90.094408
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