Long-distance spin transport in frustrated hyperkagome magnet Gd3Ga5O12

TL;DR

This paper demonstrates long-distance spin transport in a frustrated hyperkagome magnet Gd3Ga5O12, revealing a novel anomalous state with potential applications in spintronics and insights into spin dynamics in frustrated systems.

Contribution

It reports the discovery of long-distance spin transport in a frustrated magnet and characterizes its unique anomalous state, which differs from conventional magnetic materials.

Findings

Spin transport distance exceeds 480 μm, surpassing ordered magnets.

Monte Carlo simulations show significant spin fluctuations and absence of magnons.

The anomalous state responds like an overdamped forced oscillator.

Abstract

Transport of spin angular momentum over large distance has been a long sought-after goal in the field of spintronics. While the majority of the research effort has been devoted to the spin transport properties of magnetically ordered materials, spin transport in magnetically frustrated materials has received little attention. Here, we report an anomalous state in frustrated hyperkagome magnetic insulator Gd3Ga5O12, where spin angular momenta can be transported over a long distance of 480 {\mu}m, far exceeding the transport distance of any diffusive spin current in magnetically ordered materials, to the best of our knowledge. Monte Carlo simulations reveal significant spin fluctuations, spin-spin correlations and an absence of conventional magnons in such anomalous state; while the response of the anomalous state to perturbation is found to be akin to an overdamped forced oscillator. We find close relation of such state to the correlated ``director'' state in the material. Our result provides an effective electrical technique to characterize spin-spin correlations and frustrations; it also unveils the potential of frustrated magnets as powerful channel materials for spin transport.