论文标题
直接可视化MNBI4TE7中的表面自旋转变7
Direct visualization of surface spin-flip transition in MnBi4Te7
论文作者
论文摘要
我们报告使用低温磁力显微镜（MFM），报告了Anteromagnet Mnbi4te7中表面层的自旋纹流跃迁的直接可视化。跨域壁和阶梯边缘的磁对比度的观察证实，抗铁磁序持续到表面层。 MFM图像的磁场依赖性表明，表面磁层在磁场上经历一阶自旋转变，该磁场低于散装过渡，与修订后的磨坊的模型非常吻合。我们的分析表明表面磁层中的顺序参数有所增强，这意味着在单层极限中强大的铁磁磁性。表面旋转过渡的直接可视化不仅打开了对分层抗铁磁体中表面元磁过渡的探索，而且还为实现MNBI4TE7和其他天然超级晶状体拓扑拓扑磁铁的超薄薄膜中量化的运输提供了实验支持。
We report direct visualization of spin-flip transition of the surface layer in antiferromagnet MnBi4Te7, a natural superlattice of alternating MnBi2Te4 and Bi2Te3 layers, using cryogenic magnetic force microscopy (MFM). The observation of magnetic contrast across domain walls and step edges confirms that the antiferromagnetic order persists to the surface layers. The magnetic field dependence of the MFM images reveals that the surface magnetic layer undergoes a first-order spin-flip transition at a magnetic field that is lower than the bulk transition, in excellent agreement with a revised Mills' model. Our analysis indicates an enhancement of the order parameter in the surface magnetic layer, implying robust ferromagnetism in the single-layer limit. The direct visualization of surface spin-flip transition not only opens up exploration of surface metamagnetic transitions in layered antiferromagnets, but also provides experimental support for realizing quantized transport in ultra-thin films of MnBi4Te7 and other natural superlattice topological magnets.
