Extended Data Figure 2: Characterizations of monolayer and bilayer Cr2Ge2Te6 flakes.
From: Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals
a, A representative optical image of exfoliated bilayer flakes. White arrows point to bilayer flakes. b, An optical image of a specific bilayer flake. c, The environmental AFM image of the bilayer flake in b, showing that a large monolayer flake attaches to the bilayer flake (left). The corresponding AFM height profiles are also shown (right). d, e, Optical (d) and SEM (e) images of thin Cr2Ge2Te6 flakes. The SEM image reveals an additional flake (circled by a white dashed line in e, adjacent to the bilayer strip), which might be a degraded monolayer flake (degradation can be seen from the bubble-like features).
