Spin Superfluidity in Biaxial Antiferromagnetic Insulators

Abstract

Antiferromagnets may exhibit spin superfluidity since the dipole interaction is weak. We seek to establish that this phenomenon occurs in insulators such as NiO, which is a good spin conductor according to previous studies. We investigate nonlocal spin transport in a planar antiferromagnetic insulator with a weak uniaxial anisotropy. The anisotropy hinders spin superfluidity by creating a substantial threshold that the current must overcome. Nevertheless, we show that applying a high magnetic field removes this obstacle near the spin-flop transition of the antiferromagnet. Importantly, the spin superfluidity can then persist across many micrometers, even in dirty samples.

5.5 pages, 4 figures

References in corpus (11)

• Bose-Einstein Condensation in Magnetic Insulators
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Cited by in corpus (7)

• Spin Insulatronics
• Spin Superfluidity in Biaxial Antiferromagnetic Insulators
• The dynamics of bimeron skyrmions in easy-plane magnets induced by a spin supercurrent
• Rectification of the spin Seebeck current in noncollinear antiferromagnets
• Spin superfluidity in noncollinear antiferromagnets
• Superfluid spin transport in magnetically ordered solids
• Magnon spin transport around the compensation magnetic field in easy-plane antiferromagnetic insulators