Large unconventional anomalous Hall effect far above room temperature in epitaxial Fe$_3$Ga$_4$ films

TL;DR

This paper reports the discovery of a large unconventional anomalous Hall effect at temperatures well above room temperature in epitaxial Fe$_3$Ga$_4$ films, driven by fluctuation-induced spin textures, promising for spintronic applications.

Contribution

The study demonstrates for the first time that epitaxial Fe$_3$Ga$_4$ films exhibit a significant UAHE at high temperatures and low magnetic fields, linked to a transverse-conical-spiral phase.

Findings

Large UAHE observed far above room temperature

UAHE stabilized at low magnetic fields

Potential for spintronic device applications

Abstract

Noncoplanar spin textures usually exhibit a finite scalar spin chirality (SSC) that can generate effective magnetic fields and lead to additional contributions to the Hall effect, namely topological or unconventional anomalous Hall effect (UAHE). Unlike topological spin textures (e.g., magnetic skyrmions), materials that exhibit fluctuation-driven SSC and UAHE are rare. So far, their realization has been limited to either low temperatures or high magnetic fields, both of which are unfavorable for practical applications. Identifying new materials that exhibit UAHE in a low magnetic field at room temperature is therefore essential. Here, we report the discovery of a large UAHE far above room temperature in epitaxial Fe$_3$Ga$_4$ films, where the fluctuation-driven SSC stems from the field-induced transverse-conical-spiral phase. Considering their epitaxial nature and the large UAHE stabilized at room temperature in a low magnetic field, Fe$_3$Ga$_4$ films represent an exciting, albeit rare, case of a promising candidate material for spintronic devices.