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Large topological Hall effect in the non-collinear phase of an antiferromagnet

Author

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  • Christoph Sürgers

    (Karlsruhe Institute of Technology, Physikalisches Institut, PO Box 6980
    Karlsruhe Institute of Technology, DFG Center for Functional Nanostructures, PO Box 6980)

  • Gerda Fischer

    (Karlsruhe Institute of Technology, Physikalisches Institut, PO Box 6980)

  • Patrick Winkel

    (Karlsruhe Institute of Technology, Physikalisches Institut, PO Box 6980)

  • Hilbert v. Löhneysen

    (Karlsruhe Institute of Technology, Physikalisches Institut, PO Box 6980
    Karlsruhe Institute of Technology, DFG Center for Functional Nanostructures, PO Box 6980
    Karlsruhe Institute of Technology, Institut für Festkörperphysik, PO Box 3640)

Abstract

Non-trivial spin arrangements in magnetic materials give rise to the topological Hall effect observed in compounds with a non-centrosymmetric cubic structure hosting a skyrmion lattice, in double-exchange ferromagnets and magnetically frustrated systems. The topological Hall effect has been proposed to appear also in presence of non-coplanar spin configurations and thus might occur in an antiferromagnetic material with a highly non-collinear and non-coplanar spin structure. Particularly interesting is a material where the non-collinearity develops not immediately at the onset of antiferromagnetic order but deep in the antiferromagnetic phase. This unusual situation arises in non-cubic antiferromagnetic Mn5Si3. Here we show that a large topological Hall effect develops well below the Néel temperature as soon as the spin arrangement changes from collinear to non-collinear with decreasing temperature. We further demonstrate that the effect is not observed when the material is turned ferromagnetic by carbon doping without changing its crystal structure.

Suggested Citation

  • Christoph Sürgers & Gerda Fischer & Patrick Winkel & Hilbert v. Löhneysen, 2014. "Large topological Hall effect in the non-collinear phase of an antiferromagnet," Nature Communications, Nature, vol. 5(1), pages 1-8, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4400
    DOI: 10.1038/ncomms4400
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    1. Helena Reichlova & Rafael Lopes Seeger & Rafael González-Hernández & Ismaila Kounta & Richard Schlitz & Dominik Kriegner & Philipp Ritzinger & Michaela Lammel & Miina Leiviskä & Anna Birk Hellenes & K, 2024. "Observation of a spontaneous anomalous Hall response in the Mn5Si3 d-wave altermagnet candidate," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Gaojie Zhang & Fei Guo & Hao Wu & Xiaokun Wen & Li Yang & Wen Jin & Wenfeng Zhang & Haixin Chang, 2022. "Above-room-temperature strong intrinsic ferromagnetism in 2D van der Waals Fe3GaTe2 with large perpendicular magnetic anisotropy," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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