Strain-dependent magnetism and anomalous Hall effect in noncollinear antiferromagnetic Mn3Pt films

The exploration of Berry curvature physics and the related non-trivial magnetic transport of two-dimensional kagome spin-lattice structure of Mn atoms in noncollinear antiferromagnetic materials, has received widespread attention in recent years. Current research is mainly focused on the hexagonal chiral antiferromagnets such as Mn3Sn. However, there are few researches about face-centered cubic (fcc) noncollinear antiferromagnetism. In this work, the influence of strain on the magnetic properties and the anomalous Hall effect (AHE) of the fcc noncollinear antiferromagnetic Mn3Pt films were systematically explored. The results showed that the ferromagnetic signal derived from the tilt of the magnetic moment of Mn atoms in the kagome structures, as well as the anomalous Hall resistance originating from the non-zero Berry curvature, had comparable response tendency to the strain, differing from hexagonal chiral antiferromagnets. An anomalous Hall conductivity exceeding 100 (Ω cm)−1 was obtained by tuning the film thickness of Mn3Pt. In addition, the relationship among the Berry phase, magnetic properties, and AHE in Mn3Pt was further verified by regulating the crystal growth orientation. The results established Mn3Pt as a promising candidate for its integration with room-temperature antiferromagnetic spintronics.