Spin Supercurrent

TL;DR

This paper reviews the properties and phenomena related to spin supercurrents, including their quantum states, transport mechanisms, and recent discoveries in magnetic superfluid systems like 3He.

Contribution

It provides a comprehensive overview of spin supercurrent phenomena, highlighting new experimental observations and theoretical insights in magnetic superfluidity and quantum states.

Findings

Observation of long-range magnetization transport by spin supercurrents

Discovery of spin Josephson effects and vortices

Identification of stable non-topological solitons in spin systems

Abstract

We review the main properties of Spin Waves condensation to a coherent quantum state, named Homogeneously Precessing Domain (HPD). We describe the long range coherent transport of magnetization by Spin Supercurrent in antiferromagnetic superfluid 3He. This quantum phenomenon was discovered 20 years ago. Since then, many magnetic extensions of superconductivity and superfluidity have been observed: spin Josephson phenomena, spin current vortices, spin phase slippage, long distance magnetization transport by spin supercurrents, etc. Several new supercurrent phenomena have been discovered, like magnetically excited coherent quantum states, NMR in the molecular Landau field, spin-current turbulence, formation of stable non-topological solitons etc.