Observation of an anomalous Hall effect in single-crystal Mn3Pt

• Published in: New journal of physics 2023-02, Vol.25 (2), p.023029
• Main Authors: Zuniga-Cespedes, Belén E, Manna, Kaustuv, Noad, Hilary M L, Yang, Po-Ya, Nicklas, Michael, Felser, Claudia, Mackenzie, Andrew P, Hicks, Clifford W
• Format: Article
• Language: English
• Subjects: anomalous Hall effect; Antiferromagnetism; Berry phase; Electromagnetism; Ferromagnetism; Hall effect; Magnetic anisotropy; Magnetic domains; Mn3X; noncollinear antiferromagnet; Physics; Single crystals; uniaxial pressure
• ISSN: 1367-2630
• DOI: 10.1088/1367-2630/acbc3f

The Mn3X family of compounds was the first in which a large anomalous Hall effect (AHE) was predicted to arise from a purely antiferromagnetic structure, due to the Berry curvature in momentum space. Nearly simultaneously with this prediction, a large AHE was observed experimentally in one of the hexagonal members of this family, Mn3Sn. Aligning antiferromagnetic domains, a necessary step for observation of the AHE, is more challenging for the cubic members of the Mn3X family, due to a combination of smaller spontaneous ferromagnetic moments and much stronger magnetic anisotropy. Here, we use a combination of uniaxial stress and applied magnetic field to align domains of bulk single-crystal Mn3Pt, and demonstrate for the first time a substantial AHE in a bulk sample of a cubic member of the Mn3X family. The AHE remains locked in with essentially no quantitative variation when the stress is ramped back to zero, which shows that it is not a consequence of any stress-induced ferromagnetic moment.