Fig. 2. Crystal structure of the cubic B20 germanides with antiferromagnetic spin texture.

a The unit cell contains four magnetic (M = Fe, Mn) and four Ge (blue) atoms. The vector ${\mathbf{n}}_i$ indicates the local three-fold rotation axis on the $i$th atom type. b The particular antiferromagnetic spin configuration of the magnetic moments ${\mathbf{S}}_i$ used in this work is defined by $\theta$ and $\varphi$.