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

Lee, C., Vir, P., Manna, K., Shekhar, C., Moore, J. E., Kastner, M. A., et al. (2022). Observation of a phase transition within the domain walls of ferromagnetic Co3Sn2S2. Nature Communications, 13(1): 3000, pp. 1-6. doi:10.1038/s41467-022-30460-y.

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 Creators:
Lee, Changmin1, Author
Vir, Praveen2, Author           
Manna, Kaustuv2, Author           
Shekhar, Chandra3, Author           
Moore, J. E.1, Author
Kastner, M. A.1, Author
Felser, Claudia4, Author           
Orenstein, Joseph1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863428              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: In the Bloch or Neel domain walls in ferromagnets, the magnetization rotates smoothly from up to down, preserving its magnitude. Here, Lee et al show that Co3Sn2S2 exhibits a phase transition within its domain walls to a state in which the magnetization passes through zero rather than rotating as the wall is traversed.
The ferromagnetic phase of Co3Sn2S2 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 Neel walls, and suggests new strategies for manipulation of domain walls and their role in electron and spin transport.

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Language(s): eng - English
 Dates: 2022-05-302022-05-30
 Publication Status: Published in print
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 13 (1) Sequence Number: 3000 Start / End Page: 1 - 6 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723