Spin Transport in Antiferromagnetic Insulators Mediated by Magnetic Correlations

TL;DR

This study demonstrates that antiferromagnetic insulators can support long-distance spin transport, which correlates strongly with their magnetic ordering temperatures and the magnetic correlations at interfaces, revealing new insights into spin dynamics.

Contribution

The paper provides the first systematic investigation of spin transport across various antiferromagnetic insulators with different ordering temperatures, highlighting the role of magnetic correlations.

Findings

Long-distance spin transport observed in AF insulators.

Linear relationship between spin decay length and damping in YIG.

Magnetic correlations are crucial for efficient spin transport.

Abstract

We report a systematic study of spin transport in antiferromagnetic (AF) insulators having a wide range of ordering temperatures. Spin current is dynamically injected from Y3Fe5O12 (YIG) into various AF insulators in Pt/insulator/YIG trilayers. Robust, long-distance spin transport in the AF insulators is observed, which shows strong correlation with the AF ordering temperatures. We find a striking linear relationship between the spin decay length in the AFs and the damping enhancement in YIG, suggesting the critical role of magnetic correlations in the AF insulators as well as at the AF/YIG interfaces for spin transport in magnetic insulators.