Superfluid spin transport through antiferromagnetic insulators

Article

关键词: LAYERED MAGNETIC-STRUCTURES;    RESONANCE;    MAGNETORESISTANCE;    SPINTRONICS;    EXCHANGE;    SYSTEMS;    RBMNF3;    KNIF3;    MNF2;   

DOI  :  10.1103/PhysRevB.90.094408

来源: SCIE

【 摘 要 】

Atheoretical 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 Neel 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 vertical bar 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 vertical bar 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 vertical bar metal and ferromagnet vertical bar metal interfaces is made.

【 授权许可】

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