Metamagnetism of Weakly Coupled Antiferromagnetic Topological Insulators
Aoyu Tan, Valentin Labracherie, N. R. Kunchur, A. U. B. Wolter, Joaquin Cornejo, Joseph Dufouleur, B. Büchner, Anna Isaeva, Romain Giraud
Abstract
The magnetic properties of the van der Waals magnetic topological insulators MnBi_{2}Te_{4} and MnBi_{4}Te_{7} are investigated by magnetotransport measurements. We evidence that the relative strength of the interlayer exchange coupling J to the uniaxial anisotropy K controls a transition from an A-type antiferromagnetic order to a ferromagneticlike metamagnetic state. A bilayer Stoner-Wohlfarth model allows us to describe this evolution, as well as the typical angular dependence of specific signatures, such as the spin-flop transition of the uniaxial antiferromagnet and the switching field of the metamagnet.