SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Focus Session: Higher-Order Magnetic Interactions - Implications in 2D and 3D Magnetism II
MA 14.2: Vortrag
Donnerstag, 30. September 2021, 14:00–14:15, H5
Short period magnetization texture of B20-MnGe explained by thermally fluctuating local moments — •Eduardo Mendive Tapia1,2, Manuel dos Santos Dias1, Sergii Grytsiuk1, Julie Staunton3, Stefan Blügel1, and Samir Lounis1 — 1Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Max-Planck-Institut für Eisenforschung, 40237 Düsseldorf, Germany — 3University of Warwick, CV4 7AL, Conventry, UK
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 [1]. Using a Disordered Local Moment theory within the KKR method [2,3], 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. –Work funded by the DAAD and EU Horizon 2020 via ERC-consolidator Grant No. 681405-DYNASORE.
[1] Fujishiro et al., Nat. Commun. 10, 1059 (2019)
[2] Gyorffy et al., J. of Phys. F: Metal Phys. 15, 1337 (1985)
[3] Jülich KKR codes (https://jukkr.fz-juelich.de)