Large Anomalous Hall Effect in a Noncoplanar Magnetic Heterostructure

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 the magnetic proximity effect remains quite weak, restricting their practical device applications. Here, a large intrinsic AHE with a resistivity of 114 nΩ cm at 5 K in noncoplanar magnetic heterostructures of Cr 5 Te 6 /Pt is reported. 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.