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Title: Spin-Josephson effects in exchange coupled antiferromagnetic insulators

Abstract

The spin superfluid analogy can be extended to include Josephson-like oscillations of the spin current. In a system of two antiferromagnetic insulators (AFMIs) separated by a thin metallic spacer, a threshold spin chemical potential established perpendicular to the direction of the Néel vector field drives terahertz oscillations of the spin current. This spin current also has a nonlinear, time-averaged component which provides a “smoking gun” signature of spin superfluidity. The time-averaged spin current can be detected via the inverse spin Hall effect in a metallic spacer with large spin-orbit coupling. The physics illustrated here with AFMIs also applies to easy-plane ferromagnetic insulators. We suggest these findings may provide a new approach for experimental verification of spin superfluidity and realization of a terahertz spin oscillator.

Authors:
 [1];  [1];  [2];  [1];  [1]
  1. Univ. of California, Riverside, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
  2. Univ. of New Hampshire, Durham, NH (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
OSTI Identifier:
1388957
Alternate Identifier(s):
OSTI ID: 1326864
Grant/Contract Number:  
SC0012670; ECCS-1408168
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 9; Related Information: SHINES partners with University of California, Riverside (lead); Arizona State University; Colorado State University; Johns Hopkins University; University of California Irvine; University of California Los Angeles; University of Texas at Austin; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics

Citation Formats

Liu, Yizhou, Yin, Gen, Zang, Jiadong, Lake, Roger K., and Barlas, Yafis. Spin-Josephson effects in exchange coupled antiferromagnetic insulators. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.094434.
Liu, Yizhou, Yin, Gen, Zang, Jiadong, Lake, Roger K., & Barlas, Yafis. Spin-Josephson effects in exchange coupled antiferromagnetic insulators. United States. doi:10.1103/PhysRevB.94.094434.
Liu, Yizhou, Yin, Gen, Zang, Jiadong, Lake, Roger K., and Barlas, Yafis. Mon . "Spin-Josephson effects in exchange coupled antiferromagnetic insulators". United States. doi:10.1103/PhysRevB.94.094434. https://www.osti.gov/servlets/purl/1388957.
@article{osti_1388957,
title = {Spin-Josephson effects in exchange coupled antiferromagnetic insulators},
author = {Liu, Yizhou and Yin, Gen and Zang, Jiadong and Lake, Roger K. and Barlas, Yafis},
abstractNote = {The spin superfluid analogy can be extended to include Josephson-like oscillations of the spin current. In a system of two antiferromagnetic insulators (AFMIs) separated by a thin metallic spacer, a threshold spin chemical potential established perpendicular to the direction of the Néel vector field drives terahertz oscillations of the spin current. This spin current also has a nonlinear, time-averaged component which provides a “smoking gun” signature of spin superfluidity. The time-averaged spin current can be detected via the inverse spin Hall effect in a metallic spacer with large spin-orbit coupling. The physics illustrated here with AFMIs also applies to easy-plane ferromagnetic insulators. We suggest these findings may provide a new approach for experimental verification of spin superfluidity and realization of a terahertz spin oscillator.},
doi = {10.1103/PhysRevB.94.094434},
journal = {Physical Review B},
issn = {2469-9950},
number = 9,
volume = 94,
place = {United States},
year = {2016},
month = {9}
}

Journal Article:
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