# Field induced topological Hall effect in non-coplanar triangular antiferromagnetic geometry of Mn3Sn

## TL;DR

This paper reports the discovery of a large, field-induced topological Hall effect in Mn3Sn, caused by a transition from a trivial to a non-trivial spin texture, revealing new magnetic phenomena in antiferromagnets.

## Contribution

It demonstrates the existence of a field-induced topological Hall effect in Mn3Sn due to scalar spin chirality, a novel finding in non-coplanar antiferromagnetic materials.

## Key findings

- Identification of three Hall contributions: anomalous, topological, and coexistence regions.
- Observation of scalar spin chirality-induced real space Berry curvature.
- Transition from trivial to non-trivial spin textures under magnetic field.

## Abstract

Non-collinear triangular antiferromagnets with a coplanar spin arrangement and vanishing net magnetic moment can exhibit a large anomalous Hall effect owing to their non-vanishing momentum space Berry curvature. Here we show the existence of a large field induced topological Hall effect in the non-coplanar triangular antiferromagnetic geometry of Mn3Sn. A detailed magnetic and Hall effect measurements demonstrate the presence of three distinct Hall contributions; a high temperature anomalous Hall effect, a low temperature topological Hall effect and an intermediate temperature region with coexistence of both the effects. The origin of the observed topological Hall effect is attributed to the scalar spin chirality induced real space Berry curvature that appears when the system undergoes from a trivial non-coplanar triangular spin alignment to a topologically protected non-trivial spin texture like skyrmions by application of magnetic field at low temperatures.