Superfluid spin transport through antiferromagnetic insulators
By S. Takei, B. Halperin, A. Yacoby, Y. Tserkovnyak. 2014
134 citations recorded by the source corpus.
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 N\'eel 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 $\text{antiferromagnet}|\text{metal}$ interfaces and the antiferromagnet bulk damping parameters, quantities all obtainable from experiments. We study the efficiency of spin angular-momentum transfer at an $\text{antiferromagnet}|\text{metal}$ 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 $\text{antiferromagnet}|\text{metal}$ and $\text{ferromagnet}|\text{metal}$ interfaces is made.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/7de7a9ef4c77e273407cd8b63c7db131e1fb9661
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In Atomic and Molecular Physics, and Optics
In Condensed Matter Physics
Citations in the corpus
- Antiferromagnetic spintronics (2016, methodology): “Cheng et al. (2014) and Takei et al. (2014) calculated the reflected mixing conductance (Brataas, Tserkovnyak, and Bauer, 2006), g↑↓ ¼ S−1 P mnðδmn − r↑mnr↓ mnÞ (rσmn is the reflection coefficient of a quantum state with spin σ from mode m to mode n) at the interface between antiferromagnets and…”
- Spin insulatronics (2020, background): “Spin superfluidity is also possible in AFIs, but the first predictions for the range of the spin supercurrent were short and less than microns [214].”
- Interface-Induced Phenomena in Magnetism (2016, unknown): “Long-range collective spin transport: "Spin superconductivity" has been suggested in low damping, easy-plane insulating magnets [Halperin and Hohenberg, 1969; Sonin, 1978; König et al., 2001; Sonin, 2010; Takei et al., 2014; Bender et al., 2014; Chen et al., 2014a], where interfacial spin Seebeck an”