# Spin-polarized current in non-collinear antiferromagnets

## TL;DR

This paper demonstrates that noncollinear antiferromagnets like Mn₃Sn and Mn₃Ir generate spin-polarized charge currents and transverse spin currents, similar to ferromagnets, with potential applications in spintronic devices.

## Contribution

It reveals that noncollinear antiferromagnets produce spin-polarized and transverse spin currents via mechanisms distinct from the conventional spin Hall effect, supported by ab initio calculations.

## Key findings

- Noncollinear antiferromagnets generate spin-polarized charge currents.
- These materials produce a transverse spin current with unique symmetry.
- The mechanisms differ from the conventional spin Hall effect.

## Abstract

Noncollinear antiferromagnets, such as Mn$_3$Sn and Mn$_3$Ir, were recently shown to be analogous to ferromagnets in that they have a large anomalous Hall effect. Here we show that these materials are similar to ferromagnets in another aspect: the charge current in these materials is spin-polarized. In addition, we show that the same mechanism that leads to the spin-polarized current also leads to a transverse spin current, which has a distinct symmetry and origin from the conventional spin Hall effect. We illustrate the existence of the spin-polarized current and the transverse spin current by performing \emph{ab initio} microscopic calculations and by analyzing the symmetry. We discuss possible applications of these novel spin currents, such as an antiferromagnetic metallic or tunneling junction.