Gyrotropic Fingerprints of Magnetic Topological Insulator–Unconventional Magnet Interfaces

Abstract

ABSTRACT Unambiguously identifying unconventional magnetic orders requires probes directly sensitive to their momentum‐dependent spin–split band structures. Here, we employ a Zeeman quantum geometry framework to study magnetotransport at the interface between a magnetic topological insulator and an unconventional magnetic insulator. By choosing the magnetic layer to be insulating, the transport response originates solely from the proximity‐induced exchange field, eliminating contributions from itinerant magnetic carriers. We focus on the linear intrinsic gyrotropic magnetic (IGM) response, which decomposes into conduction and displacement current components governed by the Zeeman Berry curvature and Zeeman quantum metric, respectively. We uncover a universal hierarchy in which the transverse displacement IGM response exhibits characteristic even‐fold angular harmonics for magnetic orders ranging from ‐ to ‐wave, while the longitudinal IGM response distinguishes the parity of the magnetic order through robust sign‐reversal patterns. In contrast, the conduction IGM component remains largely insensitive to the underlying magnetic symmetry. Consequently, the displacement IGM current emerges as a high‐fidelity symmetry fingerprint of unconventional magnetic order. Using realistic parameters for experimentally accessible heterostructures, we demonstrate that these signatures are experimentally measurable, establishing Zeeman quantum geometry as a powerful framework for characterizing unconventional magnetic insulators via gyrotropic transport responses.