Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 14: Topological Insulators 2 (jointly with DS, MA, HL, O) (joint session TT/HL)

HL 14.4: Talk

Monday, March 16, 2020, 15:45–16:00, HSZ 103

Meta-magnetism of weakly-coupled antiferromagnetic topological insulators — •Aoyu Tan^1,3, Valentin Labracherie^1,3, Narayan Kunchur¹, Anja Wolter¹, Joseph Dufouleur¹, Bernd Buechner^1,2, Anna Isaeva^1,2, and Romain Giraud^1,3 — ¹Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01069 Dresden, Germany — ²Faculty of Physics, TU Dresden, 01062 Dresden, Germany — ³Univ. Grenoble Alpes, CEA, CNRS, Spintec, 38000 Grenoble, France

The magnetic properties of van der Waals magnetic topological insulators MnBi₂Te₄ and MnBi₄Te₇ 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. In micron-size magnets, the single-domain switching-field astroid are however partly truncated by the nucleation of domain walls along the easy-axis direction.