Complex magnetism of B20-MnGe: from spin-spirals, hedgehogs to monopoles

B20 compounds are the playground for various non-trivial magnetic textures such as skyrmions, which are topologically protected states. Recent measurements on B20-MnGe indicate no clear consensus on its magnetic behavior, which is characterized by the presence of either spin-spirals or 3-dimensional...

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Bibliographic Details
Published in:arXiv.org 2019-07
Main Authors: Bornemann, Marcel, Grytsiuk, Sergii, Baumeister, Paul F, Manuel dos Santos Dias, Zeller, Rudolf, Lounis, Samir, Blügel, Stefan
Format: Article
Language:English
Subjects:
Algorithms
Computer simulation
Cubic lattice
Electron density
Ferromagnetism
First principles
Hypothetical particles
Magnetic properties
Magnetism
Monopoles
Particle theory
Spirals
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Summary:B20 compounds are the playground for various non-trivial magnetic textures such as skyrmions, which are topologically protected states. Recent measurements on B20-MnGe indicate no clear consensus on its magnetic behavior, which is characterized by the presence of either spin-spirals or 3-dimensional objects interpreted to be a cubic lattice of hedgehogs and anti-hedgehogs. Utilizing a massively parallel linear scaling all-electron density functional algorithm, we find from full first-principles simulations on cells containing thousands of atoms that upon increase of the compound volume, the state with lowest energy switches across different magnetic phases: ferromagnetic, spin-spiral, hedgehog and monopole.
ISSN:2331-8422
DOI:10.48550/arxiv.1904.12176