Large Anomalous Hall Effect in a Noncoplanar Magnetic Heterostructure

TL;DR

This paper reports a record-high intrinsic anomalous Hall effect in a noncoplanar magnetic heterostructure, driven by interface topological spin textures and Berry curvature reconstruction, with implications for spintronic device applications.

Contribution

It demonstrates a large intrinsic AHE in Cr5Te6/Pt heterostructures, revealing the role of topological spin textures and Berry curvature at interfaces, advancing spintronic research.

Findings

Record-high AHE resistivity of 114 nΩ·cm at 5 K.

Visualization of topological spin textures at the interface.

Berry curvature reconstruction causes AHE reversal.

Abstract

The anomalous Hall effect (AHE) occurs in magnetic systems and also unexpectedly in non-magnetic materials adjacent to magnetic insulators via the heterointerface interactions. However, the AHE in heterostructures induced by magnetic proximity effect remains quite weak, restricting their practical device applications. Here, we report a large intrinsic AHE with a resistivity of 114 n{\Omega} cm at 5 K in noncoplanar magnetic heterostructures of Cr5Te6/Pt. This is the record-high AHE value among all the magnetic insulators/heavy metal heterostructures. A reversal of the AHE signal occurs due to the reconstruction of Berry curvature at the Fermi level, which is verified by the first-principles calculations. Topological spin textures at the interface are directly visualized via high-magnetic-field magnetic force microscopy, which accounts for the large AHE, as confirmed by the atomic simulations. These findings open a new avenue for exploring the large AHE in heterointerfaces and facilitate the potential applications in topological spintronic devices.