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  Anomalous and topological Hall effects in epitaxial thin films of the noncollinear antiferromagnet Mn3Sn

Taylor, J. M., Markou, A., Lesne, E., Sivakumar, P. K., Luo, C., Radu, F., et al. (2020). Anomalous and topological Hall effects in epitaxial thin films of the noncollinear antiferromagnet Mn3Sn. Physical Review B, 101(9): 094404, pp. 1-6. doi:10.1103/PhysRevB.101.094404.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-E967-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-E96B-D
Genre: Journal Article

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 Creators:
Taylor, James M.1, Author
Markou, Anastasios2, Author              
Lesne, Edouard1, Author
Sivakumar, Pranava Keerthi1, Author
Luo, Chen1, Author
Radu, Florin1, Author
Werner, Peter1, Author
Felser, Claudia3, Author              
Parkin, Stuart S. P.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Noncollinear antiferromagnets with a D0(19) (space group = 194, P6(3)/mmc) hexagonal structure have garnered much attention for their potential applications in topological spintronics. Here, we report the deposition of continuous epitaxial thin films of such a material, Mn3Sn, and characterize their crystal structure using a combination of x-ray diffraction and transmission electron microscopy. Growth of Mn3Sn films with both (0001) c-axis orientation and (40 (4) over bar3) texture is achieved. In the latter case, the thin films exhibit a small uncompensated Mn moment in the basal plane, quantified via magnetometry and x-ray magnetic circular dichroism experiments. This cannot account for the large anomalous Hall effect simultaneously observed in these films, even at room temperature, with magnitude sigma(xy)(mu H-0 = 0 T) = 21 Omega(-1) cm(-1) and coercive field mu H-0(c) = 1.3 T. We attribute the origin of this anomalous Hall effect to momentum-space Berry curvature arising from the symmetry-breaking inverse triangular spin structure of Mn3Sn. Upon cooling through the transition to a glassy ferromagnetic state at around 50 K, a peak in the Hall resistivity close to the coercive field emerges. This indicates the onset of a topological Hall effect contribution, arising from a nonzero scalar spin chirality that generates a real-space Berry phase. We demonstrate that the polarity of this topological Hall effect, and hence the chiral nature of the noncoplanar magnetic structure driving it, can be controlled using different field-cooling conditions.

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Language(s): eng - English
 Dates: 2020-03-022020-03-02
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 101 (9) Sequence Number: 094404 Start / End Page: 1 - 6 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008