Transport properties of spin superfluids: comparing easy-plane ferro- and antiferromagnets

TL;DR

This study compares spin-superfluid transport in easy-plane ferro- and antiferromagnets using a classical spin model, revealing similar transport ranges despite differences in spin accumulation and analyzing the effects of frequency and phase slips.

Contribution

It provides a direct comparison of spin-superfluid transport in ferro- and antiferromagnets within a unified model framework, highlighting their similar transport ranges and the role of driving frequency.

Findings

Spin-superfluid transport is robust against boundary, thermal, and damping variations.

Antiferromagnets have smaller spin accumulation but similar transport range as ferro-magnets.

Critical frequency for phase slips affects spin accumulation stability.

Abstract

We present a study on spin-superfluid transport based on an atomistic, classical spin model. Easy-plane ferro- as well as antiferromagnets are considered, which allows for a direct comparison of these two material classes based on the same model assumptions. We find a spin-superfluid transport which is robust against variations of the boundary conditions, thermal fluctuations, and dissipation modeled via Gilbert damping. Though the spin accumulations is smaller for antiferromagnets the range of the spin-superfluid transport turns out to be identical for ferro- and antiferromagnets. Finally, we calculate and explore the role of the driving frequency and especially the critical frequency, where phase slips occur and the spin accumulation breaks down.