Metamagnetism of Weakly Coupled Antiferromagnetic Topological Insulators.
Metamagnetism of Weakly Coupled Antiferromagnetic Topological Insulators.
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DOI：
10.1103/physrevlett.124.197201
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发表时间：
2019-12
影响因子：
8.6
通讯作者：
A. Tan;V. Labracherie;N. Kunchur;A. Wolter;Joaquin Cornejo;J. Dufouleur;B. Büchner;A. Isaeva
中科院分区：
文献类型：
--
作者：
A. Tan;V. Labracherie;N. Kunchur;A. Wolter;Joaquin Cornejo;J. Dufouleur;B. Büchner;A. Isaeva
通过磁输运测量研究了范德华磁拓扑绝缘体MnBi_{2}Te_{4}和MnBi_{4}Te_{7}的磁特性。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态的转变。双层 Stoner-Wohlfarth 模型使我们能够描述这种演化，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和元磁体的切换场。
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.