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Meta-magnetism of weakly-coupled antiferromagnetic topological insulators

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arxiv 1912.13113 v2 pith:SXXDR7IE submitted 2019-12-30 cond-mat.mes-hall cond-mat.mtrl-sci

Meta-magnetism of weakly-coupled antiferromagnetic topological insulators

classification cond-mat.mes-hall cond-mat.mtrl-sci
keywords antiferromagneticinsulatorsmagneticmnbitopologicaltransitionuniaxiala-type
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

The magnetic properties of the van der Waals magnetic topological insulators MnBi$_2$Te$_4$ and MnBi$_4$Te$_7$ are investigated by magneto-transport measurements. We evidence that the relative strength of the inter-layer exchange coupling J to the uniaxial anisotropy K controls a transition from an A-type antiferromagnetic order to a ferromagnetic-like metamagnetic state. A bi-layer 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.

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