Field-free, spin-current control of magnetization in non-collinear chiral antiferromagnets

TL;DR

This paper demonstrates that in non-collinear chiral antiferromagnets, stable magnetic order can be controlled in a field-free manner using spin currents, enabling potential spintronic applications without external magnetic fields.

Contribution

It introduces a method to control magnetic structures in antiferromagnets via spin-current injection without external magnetic fields, based on a simplified two-dimensional model.

Findings

Magnetic order remains stable against thermal fluctuations without external fields.

Spin-current injection can manipulate in-plane magnetic structures.

Control is achievable when Mn spins are confined within Kagome layers.

Abstract

Non-collinear chiral antiferromagnets like Mn3Sn and Mn3Ge are known to show gigantic anomalous Hall response depending on the orientation of their inverse chiral magnetic order of Mn atoms in Kagome layers. Here we study the stability of such magnetic order in the absence of external magnetic fields on the basis of stochastic Landau-Lifshitz-Gilbert equation for a simplified two-dimensional model of these materials. We find that even without external magnetic fields, the ordered state is, once formed, highly stable against thermal fluctuations. Moreover, we show that if Mn spins are well confined inside each Kagome layers, by injecting spin-current using spin-filtering effect of ferromagnetic metals, we can control the in-plane magnetic structure in a field free way.