The chiral Anomalous Hall effect in re-entrant AuFe alloys

TL;DR

This study investigates the anomalous Hall effect in AuFe alloys, revealing a topological Hall contribution linked to spin chirality, which persists up to 150 K, confirming theoretical predictions about chiral-induced Hall effects.

Contribution

It provides experimental evidence for a topological Hall term induced by spin chirality in AuFe alloys, supporting theoretical models.

Findings

Identification of a chiral Hall contribution linked to local spin tilting

Persistence of the chiral signal up to 150 K

Confirmation of a topological Hall effect induced by chirality

Abstract

The Hall effect has been studied in a series of AuFe samples in the re-entrant concentration range, as well as in part of the spin glass range. An anomalous Hall contribution linked to the tilting of the local spins can be identified, confirming theoretical predictions of a novel topological Hall term induced when chirality is present. This effect can be understood in terms of Aharonov-Bohm-like intrinsic current loops arising from successive scatterings by canted local spins. The experimental measurements indicate that the chiral signal persists, meaning scattering within the nanoscopic loops remains coherent, up to temperatures of the order of 150 K.