Dzyaloshinskii-Moriya Interaction and Hall Effects in the Skyrmion Phase of Mn1-xFexGe

We carry out density functional theory calculations which demonstrate that the electron dynamics in the Skyrmion phase of Fe-rich Mn1-xFexGe alloys is governed by Berry phase physics. We observe that the magnitude of the Dzyaloshinskii-Moriya interaction directly related to the mixed space-momentum...

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Bibliographic Details
Published in:Physical review letters 2015-07, Vol.115 (3)
Main Authors: Gayles, J, Freimuth, F, Schena, T, Lani, G, Mavropoulos, P, Duine, R A, Blugel, S, Sinova, J, Mokrousov, Y
Format: Article
Language:English
Subjects:
Density functional theory
Germanium
Hall effect
Hypothetical particles
Iron
Manganese
Manganese base alloys
Nanostructure
Particle theory
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Summary:We carry out density functional theory calculations which demonstrate that the electron dynamics in the Skyrmion phase of Fe-rich Mn1-xFexGe alloys is governed by Berry phase physics. We observe that the magnitude of the Dzyaloshinskii-Moriya interaction directly related to the mixed space-momentum Berry phases, changes sign and magnitude with concentration x in direct correlation with the data of Shibata et al. [Nat. Nanotechnol. 8, 723 (2013)]. The computed anomalous and topological Hall effects in FeGe are also in good agreement with available experiments. We further develop a simple tight-binding model able to explain these findings. Finally, we show that the adiabatic Berry phase picture is violated in the Mn-rich limit of the alloys.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.115.036602