Room-temperature third-order nonlinear anomalous Hall effect in ferromagnetic metal Fe3GaTe2

TL;DR

This paper reports the observation of room-temperature third-order nonlinear anomalous Hall effect in ferromagnetic Fe3GaTe2, linked to Berry curvature quadrupole, with implications for nonlinear electronic devices.

Contribution

First demonstration of room-temperature third-order NLAHE in a ferromagnetic metal, revealing its relation to Berry curvature quadrupole and potential for electronic applications.

Findings

Third-order NLAHE observed up to ~350 K in Fe3GaTe2.

NLAHE exhibits hysteretic behavior with magnetic field.

Scaling suggests NLAHE is related to Berry curvature quadrupole.

Abstract

Berry curvature, as the imaginary component of quantum geometry, plays a crucial role in condensed matter physics. The spatial distribution of Berry curvature can be characterized by its dipole and multipole moments, which can induce the nonlinear anomalous Hall effect (NLAHE). To date, the NLAHE has been demonstrated in various materials, yet reports on room-temperature NLAHE are still limited. In this work, we report the observation of the third-order NLAHE in ferromagnetic metal Fe3GaTe2. The third-order NLAHE shows hysteretic behavior with the variation of magnetic field, where the coercive field is the same as that of the anomalous Hall effect, and the third-order NLAHE remains observable up to the Curie temperature (~350 K). The scaling analysis suggests that the third-order NLAHE may be attributed to the Berry curvature quadrupole. Our work not only provides an approach to study magnetic materials through nonlinear electric transports, but also opens up possibilities for the future development of room-temperature third-order nonlinear electronic devices.