Strong-Correlation Derived Spin-Fermion Model for Skyrmions in MnGe

Abstract

MnGe has been reported as a candidate of three-dimensional (3D) skyrmion crystal in comparison to the two-dimensional (2D) skyrmion observed in most other B20 compounds like MnSi. In addition, the small-sized skyrmions in MnGe are desired properties for information storage. By performing the density functional theory (DFT) calculations and model simulations based on the DFT-informed tight-binding Hamiltonian, we explore the nature of the 3D skyrmion in MnGe. By invoking a dual nature of d-electrons on Mn atoms, we propose a strong-correlation derived spin-fermion model with an antiferromagnetic coupling between the localized and itinerant moments. This model could explain the drastic difference of magnetic moments between MnGe and MnSi compounds. In addition, we find that the 3D or 2D nature of skyrmions are dependent on the coupling strength.

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Cited by in corpus (10)

• Complex magnetism of B20-MnGe: from spin-spirals, hedgehogs to monopoles
• Antiferromagnetic Skyrmions and Skyrmion Density Wave in Rashba Hund's Insulator
• Engineering antiferromagnetic skyrmions and antiskyrmions at metallic interfaces
• Dual nature of magnetism in MnSi
• Resonant optical topological Hall conductivity from skyrmions
• Antiskyrmions and Bloch Skyrmions in Magnetic Dresselhaus Metals
• Spin-orbit coupled Hubbard skyrmions
• Experimental determination of the spin Hamiltonian of the cubic chiral magnet MnSi
• Zero-field 29Si nuclear magnetic resonance signature of helimagnons in MnSi
• Origin of the suppression of magnetic order in MnSi under hydrostatic pressure