论文标题
抗铁磁拓扑绝缘子MNBI $ _2 $ TE $ _4 $ $ _4 $
Robust A-type order and spin-flop transition on the surface of the antiferromagnetic topological insulator MnBi$_2$Te$_4$
论文作者
论文摘要
在这里，我们向MNBI $ _2 $ _2 $ _4 $ _4 $单晶的表面层单轴A型抗铁磁顺序持续介绍了微观证据。我们的结果揭示了在表面台阶边缘和域壁上终止依赖性的磁对比度，可以通过软磁性的薄层筛选。通过观察到终止依赖性的表面自旋透光跃迁，这是几十年前在理论上提出的。我们的结果不仅为了解抗磁性拓扑绝缘子MNBI $ _2 $ TE $ _4 $的电子特性提供了关键的成分，而且还为探索自然抗Ferromagnets中固有的表面元磁过渡开设了新的范式。
Here we present microscopic evidence of the persistence of uniaxial A-type antiferromagnetic order to the surface layers of MnBi$_2$Te$_4$ single crystals using magnetic force microscopy. Our results reveal termination-dependent magnetic contrast across both surface step edges and domain walls, which can be screened by thin layers of soft magnetism. The robust surface A-type order is further corroborated by the observation of termination-dependent surface spin-flop transitions, which have been theoretically proposed decades ago. Our results not only provide key ingredients for understanding the electronic properties of the antiferromagnetic topological insulator MnBi$_2$Te$_4$, but also open a new paradigm for exploring intrinsic surface metamagnetic transitions in natural antiferromagnets.
