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Short period magnetization texture of B20-MnGe explained by thermally fluctuating local moments

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Mendive-Tapia,  Eduardo
Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Mendive-Tapia, E., dos Santos Dias, M., Grytsiuk, S., Staunton, J. B., Blügel, S., & Lounis, S. (2021). Short period magnetization texture of B20-MnGe explained by thermally fluctuating local moments. Physical Review B, 103(2): 024410. doi:10.1103/PhysRevB.103.024410.


Cite as: http://hdl.handle.net/21.11116/0000-0007-F003-6
Abstract
B20-type compounds, such as MnSi and FeGe, host helimagnetic and skyrmion phases at the mesoscale, which are canonically explained by the combination of ferromagnetic isotropic interactions with weaker chiral Dzyaloshinskii-Moriya ones. Mysteriously, MnGe evades this paradigm as it displays a noncollinear magnetic state at a much shorter nanometer scale. Here we show that the length scale and volume-dependent magnetic properties of MnGe stem from purely isotropic exchange interactions, generally obtained in the paramagnetic state. Our approach is validated by comparing MnGe with the canonical B20-helimagnet FeGe. The free energy of MnGe is calculated, from which we show how triple-q magnetic states can stabilize by adding higher-order interactions. © 2021 authors. Published by the American Physical Society.