Fig. 3
From: Wafer-scale two-dimensional ferromagnetic Fe3GeTe2 thin films grown by molecular beam epitaxy
Arrott-plots using anomalous Hall data and magnetization measured by SQUID. a and b are Arrot-plots at temperatures from 70 K to 200 K. The x-axis and y-axis are B/(R xy /R xx 2) and (R xy /R xx 2)2, respectively. Dashed lines represent the linear fits to the small-region data that near magnetization saturation. Using the intercepts in y-axis (summarized in Fig. 3b) and fitting these values in a liner relation, the Curie temperature is calculated to be 216.4 ± 0.4 K. c Zero-field-cooling (ZFC) and field-cooling (FC) curves under 100 Oe for 8-nm Fe3GeTe2 grown on sapphire substrate. For FC, with decreasing the temperature, the magnetization increases, showing an opposite trend to the ZFC curve. The Curie temperature can be roughly determined to be ~ 212.8 K, comparable to 216.4 K determined by the anomalous Hall effect measurements (Fig. 3a and b). d Magnetization hysteresis at 10 K. Due to the Al2O3 substrate, stronger diamagnetic background can be seen. After subtracting the diamagnetic background of substrate, a clear hysteresis from Fe3GeTe2 thin film is depicted in the inset with the saturation magnetization of 1.23 μB per Fe
