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B20 compounds are the playground for various non-trivial magnetic texturessuch as skyrmions, which are topologically protected states. Recentmeasurements on B20-MnGe indicate no clear consensus on its magnetic behavior,which is characterized by the presence of either spin-spirals or 3-dimensionalobjects interpreted to be a cubic lattice of hedgehogs and anti-hedgehogs.Utilizing a massively parallel linear scaling all-electron density functionalalgorithm, we find from full first-principles simulations on cells containingthousands of atoms that upon increase of the compound volume, the state withlowest energy switches across different magnetic phases: ferromagnetic,spin-spiral, hedgehog and monopole.

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