Tan Aoyu, Labracherie Valentin, Kunchur Narayan, Wolter Anja U B, Cornejo Joaquin, Dufouleur Joseph, Büchner Bernd, Isaeva Anna, Giraud Romain
Université Grenoble Alpes, CNRS, CEA, Spintec, F-38000 Grenoble, France.
Institute for Solid State Physics, Leibniz IFW Dresden, D-01069 Dresden, Germany.
Phys Rev Lett. 2020 May 15;124(19):197201. doi: 10.1103/PhysRevLett.124.197201.
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.
通过磁输运测量研究了范德华磁性拓扑绝缘体MnBi₂Te₄和MnBi₄Te₇的磁性。我们证明，层间交换耦合J与单轴各向异性K的相对强度控制着从A型反铁磁序到类铁磁变磁状态的转变。一个双层斯托纳 - 沃尔法特模型使我们能够描述这种演变，以及特定特征的典型角度依赖性，例如单轴反铁磁体的自旋翻转转变和变磁体的开关场。
