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

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.

14 pages, 3 figures, 2 appendices

References in corpus (9)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
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• Rare-earth/transition-metal magnetic interactions in pristine and (Ni,Fe)-doped YCo5 and GdCo5
• Ab initio analysis of magnetic properties of prototype B20 chiral magnet FeGe
• Prospecting chiral multi-site interactions in prototypical magnetic systems
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• Caloric effects around phase transitions in magnetic materials described by ab initio theory: The electronic glue and fluctuating local moments
• Composition-dependent magnetic response properties of Mn${}_{1-x}$Fe${}_x$Ge alloys

Cited by in corpus (5)

• Fermi-surface origin of skyrmion lattices in centrosymmetric rare-earth intermetallics
• Skyrmion crystal and spiral phases in centrosymmetric bilayer magnets with staggered Dzyaloshinskii-Moriya interaction
• Skyrmion crystals in centrosymmetric triangular magnets under hexagonal and trigonal single-ion anisotropy
• Ab initio calculation of the magnetic Gibbs free energy of materials using magnetically constrained supercells
• Anisotropic spin model and multiple-$Q$ states in cubic systems