Meta-magnetism of weakly-coupled antiferromagnetic topological insulators

Aoyu Tan; Valentin Labracherie; Narayan Kunchur; Anja U. B. Wolter; Joaquin Cornejo; Joseph Dufouleur; Bernd Büchner; Anna Isaeva; Romain Giraud

doi:10.1103/PhysRevLett.124.197201

Meta-magnetism of weakly-coupled antiferromagnetic topological insulators

Mesoscale and Nanoscale Physics 2020-05-20 v2 Materials Science

Authors: Aoyu Tan , Valentin Labracherie , Narayan Kunchur , Anja U. B. Wolter , Joaquin Cornejo , Joseph Dufouleur , Bernd Büchner , Anna Isaeva , Romain Giraud

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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.

Keywords

van der waals magnetic topological insulators metamagnetism a-type antiferromagnetic order inter-layer exchange coupling uniaxial anisotropy stoner-wohlfarth model spin-flop transition

Cite

@article{arxiv.1912.13113,
  title  = {Meta-magnetism of weakly-coupled antiferromagnetic topological insulators},
  author = {Aoyu Tan and Valentin Labracherie and Narayan Kunchur and Anja U. B. Wolter and Joaquin Cornejo and Joseph Dufouleur and Bernd Büchner and Anna Isaeva and Romain Giraud},
  journal= {arXiv preprint arXiv:1912.13113},
  year   = {2020}
}

Comments

22 pages, 8 figures; typos corrected, references added

Meta-magnetism of weakly-coupled antiferromagnetic topological insulators

Abstract

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