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Cr2Ge2Te6 (CGT), a layered ferromagnetic insulator, has attracted a greatdeal of interest recently owing to its potential for integration with Diracmaterials to realize the quantum anomalous Hall effect (QAHE) and to developnovel spintronics devices. Here, we study the uniaxial magnetic anisotropyenergy of single-crystalline CGT and determine that the magnetic easy axis isdirected along the c-axis in its ferromagnetic phase. In addition, CGT is aninsulator below the Curie temperature. These properties make CGT a potentiallypromising candidate substrate for integration with topological insulators forthe realization of the high-temperature QAHE.

Magnetic anisotropy of the single-crystalline ferromagnetic insulator Cr2Ge2Te6