Experimental Realization of Room Temperature Topological Hall Effect in Kagome Antiferromagnet

TL;DR

This paper reports the first observation of a large, pure topological Hall effect in Mn$_3$Sn at room temperature, with implications for topotronic applications, and explores how Fe doping influences this effect.

Contribution

It demonstrates the experimental realization of room temperature topological Hall effect in a Kagome antiferromagnet, Mn$_3$Sn, and investigates the effects of Fe doping on this phenomenon.

Findings

Large, pure topological Hall effect observed at room temperature in Mn$_3$Sn.

Fe doping suppresses the topological Hall effect.

Topological properties are highly anisotropic.

Abstract

Magnetic topological semimetals are the manifestations of interplay between electronic and magnetic phases of the matter, leading to peculiar characteristics such as the anomalous Hall effect (AHE) and topological Hall effect (THE). Mn$_3$Sn is a time-reversal symmetry broken (TRS) magnetic Weyl semimetal showing topological characteristics within the Kagome lattice network. In this study, for the first time, we uncover large and pure topological Hall effect in Mn$_3$Sn at the room temperature, which is gradually suppressed by Fe doping at the Mn site of Mn$_{3-x}$Fe$_x$Sn. We further identify that the topological properties of these systems are highly anisotropic. These findings promise the realization of potential topotronic applications at room temperature.