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  Topological Hall effect arising from the mesoscopic and microscopic non-coplanar magnetic structure in MnBi

He, Y., Schneider, S., Helm, T., Gayles, J., Wolf, D., Soldatov, I., et al. (2022). Topological Hall effect arising from the mesoscopic and microscopic non-coplanar magnetic structure in MnBi. Acta Materialia, 226: 117619, pp. 1-9. doi:10.1016/j.actamat.2022.117619.

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 Creators:
He, Yangkun1, Author              
Schneider, Sebastian2, Author
Helm, Toni3, Author              
Gayles, Jacob1, Author              
Wolf, Daniel2, Author
Soldatov, Ivan2, Author
Borrmann, Horst4, Author              
Schnelle, Walter5, Author              
Schaefer, Rudolf2, Author
Fecher, Gerhard H.6, Author              
Rellinghaus, Bernd2, Author
Felser, Claudia7, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Physics of Microstructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_2466701              
4Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863410              
5Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
6Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863431              
7Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: MnBi, Noncoplanar spin structure, Skyrmion bubble, Topological hall effect, Binary alloys, Bismuth alloys, Spin Hall effect, Superconducting materials, Topology, Important features, Mesoscopics, Non-coplanar, Noncoplanar spin structure, Sample sizes, Skyrmion bubble, Skyrmions, Spin chirality, Spin structures, Topological hall effect, Manganese alloys
 Abstract: The topological Hall effect (THE), induced by the Berry curvature that originates from non-zero scalar spin chirality, is an important feature for mesoscopic topological structures, such as skyrmions. However, the THE might also arise from other microscopic non-coplanar spin structures in the lattice. Thus, the origin of the THE inevitably needs to be determined to fully understand skyrmions and find new host materials. Here, we examine the Hall effect in both, bulk- and micron-sized lamellar samples of MnBi. The sample size affects the temperature and field range in which the THE is detectable. Although a bulk sample exhibits the THE only upon exposure to weak fields in the easy-cone state, in micron-sized lamella the THE exists across a wide temperature range and occurs at fields near saturation. Our results show that both the non-coplanar spin structure in the lattice and topologically non-trivial skyrmion bubbles are responsible for the THE, and that the dominant mechanism depends on the sample size. Hence, the magnetic phase diagram for MnBi is size-dependent. Our study provides an example in which the THE is simultaneously induced by two mechanisms, and builds a bridge between mesoscopic and microscopic magnetic structures. © 2022

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Language(s): eng - English
 Dates: 2022-01-042022-01-04
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.actamat.2022.117619
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 226 Sequence Number: 117619 Start / End Page: 1 - 9 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100