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

Christoph Sürgers (), Gerda Fischer, Patrick Winkel and Hilbert v. Löhneysen
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Christoph Sürgers: Karlsruhe Institute of Technology, Physikalisches Institut, 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

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms4400

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