  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.
