1. Dzyaloshinskii-Moriya Interaction and Hall Effects in the Skyrmion Phase ofMn1−xFexGe
- Author
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Jacob Gayles, Yuriy Mokrousov, Timo Schena, Frank Freimuth, Rembert A. Duine, Ph. Mavropoulos, G. Lani, Stefan Blügel, and Jairo Sinova
- Subjects
Physics ,Condensed matter physics ,Skyrmion ,SPIN-DENSITY WAVE ,General Physics and Astronomy ,02 engineering and technology ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,021001 nanoscience & nanotechnology ,01 natural sciences ,CRYSTALS ,LATTICE ,Geometric phase ,Ab initio quantum chemistry methods ,Lattice (order) ,MAGNETIC SKYRMIONS ,MNSI ,0103 physical sciences ,Spin density wave ,Density functional theory ,METALS ,Berry connection and curvature ,010306 general physics ,0210 nano-technology ,Adiabatic process ,APPROXIMATION - Abstract
We carry out density functional theory calculations which demonstrate that the electron dynamics in the Skyrmion phase of Fe-rich Mn_{1-x}Fe_{x}Ge 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.
- Published
- 2015
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