Figure 2.

Domain structure of Fe₅GeTe₂ in the bulk limit. The XPEEM image shows maze domains, characteristic of Fe₅GeTe₂ in the bulk limit (T = 50 K). To enhance the visibility of domain walls, a color scale is used for the left-hand side of the image. Note that the domain size is smaller compared to Fe₃GeTe₂ (Figure S6), which is to be expected as the magnetocrystalline anisotropy is larger in Fe₃GeTe₂. There is almost no net magnetization at remanence (ratio of the bright to dark domain area is 53:47). The average domain width (across a stripe) is 250 nm for Fe₅GeTe₂ and 360 nm for Fe₃GeTe₂ (Figure S5), and the average domain lengths are <4 μm and >10 μm, respectively.