  Cr2Ge2Te6 (CGT), a layered ferromagnetic insulator, has attracted a great
deal of interest recently owing to its potential for integration with Dirac
materials to realize the quantum anomalous Hall effect (QAHE) and to develop
novel spintronics devices. Here, we study the uniaxial magnetic anisotropy
energy of single-crystalline CGT and determine that the magnetic easy axis is
directed along the c-axis in its ferromagnetic phase. In addition, CGT is an
insulator below the Curie temperature. These properties make CGT a potentially
promising candidate substrate for integration with topological insulators for
the realization of the high-temperature QAHE.
