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arXiv 2104.13381cond-mat.mes-hallcond-mat.str-el
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铁磁Co3Sn2S2畴壁内相变的观察

Observation of a phase transition within the domain walls of ferromagnetic Co3Sn2S2

Changmin Lee, Praveen Vir, Kaustuv Manna, Chandra Shekhar, J. E. Moore, M. A. Kastner, Claudia Felser, Joseph Orenstein

摘要:

Co $_3$ Sn $_2$ S $_2$的铁磁相被广泛认为是一种拓扑Weyl半金属,从传输和光谱探针的Berry曲率的动量空间单极的证据。由于能带结构对磁序高度敏感,人们的注意力集中在远低于居里温度的磁化强度、磁化率和输运测量中的异常,导致人们猜测“隐藏”相与铁磁性共存。在这里,我们报告空间分辨测量克尔效应显微镜,确定这一阶段。我们发现,异常符合深最小的畴壁(DW)的流动性,表明DW传播的两个制度之间的交叉。我们证明,这种交叉是一个二维相变内DW,其中的磁化织构从连续旋转到单向变化发生变化的表现。我们建议,这种2D过渡的存在,深内的铁磁状态的散装是一个巨大的品质因数的结果,磁晶各向异性独特的这种化合物。这项工作拓宽了传统的二元分类的DWs到布洛赫和Néel墙的视野,并提出了新的策略,操纵域壁和它们的作用,在电子和自旋输运。

英文摘要:

The ferromagnetic phase of Co$_3$Sn$_2$S$_2$ is widely considered to be a topological Weyl semimetal, with evidence for momentum-space monopoles of Berry curvature from transport and spectroscopic probes. As the bandstructure is highly sensitive to the magnetic order, attention has focused on anomalies in magnetization, susceptibility and transport measurements that are seen well below the Curie temperature, leading to speculation that a "hidden" phase coexists with ferromagnetism. Here we report spatially-resolved measurements by Kerr effect microscopy that identify this phase. We find that the anomalies coincide with a deep minimum in domain wall (DW) mobility, indicating a crossover between two regimes of DW propagation. We demonstrate that this crossover is a manifestation of a 2D phase transition that occurs within the DW, in which the magnetization texture changes from continuous rotation to unidirectional variation. We propose that the existence of this 2D transition deep within the ferromagnetic state of the bulk is a consequence of a giant quality factor for magnetocrystalline anisotropy unique to this compound. This work broadens the horizon of the conventional binary classification of DWs into Bloch and Néel walls, and suggests new strategies for manipulation of domain walls and their role in electron and spin transport.

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