Anomalous Hall effect in antiferromagnetic/non-magnetic interfaces

TL;DR

This study combines theory and experiments to explore the anomalous Hall effect at Pt/Cr interfaces, revealing that proximity-induced magnetization and band topology contribute to the observed phenomena.

Contribution

It provides new insights into the origin of the anomalous Hall effect in antiferromagnetic/non-magnetic interfaces through combined theoretical and experimental analysis.

Findings

Interfacial magnetization can be induced in Pt layers.

Anomalous Hall signals are detected at Pt/Cr interfaces.

The effect arises from proximity magnetization and band topology.

Abstract

We report a combined theoretical and experimental investigation of magnetic proximity and Hall transport in Pt/Cr bilayers. Density functional theory indicates that an interfacial magnetization can be induced in the Pt layer and a strong magnetocrystalline anisotropy with an easy axis out of plane arises in the antiferromagnet. A signal ascribed to the anomalous Hall effect is detected and associated to the interface between Pt and Cr layers. We show that this effect originates from the combination of proximity-induced magnetization and a nontrivial topology of the band structure at the interface.