Fig. 3
From: Hard magnetic properties in nanoflake van der Waals Fe3GeTe2
Anomalous Hall effect measurements performed on 10.4 nm thickness FGT device. a R xy (B) loops in the temperature regime from 2 to 140 K in which the FGT nanoflake shows ferromagnetic properties. b R xy (B) curves in the temperature regime from 150 to 185 K. The FGT nanoflake shows zero coercivity and remanence when T > 150 K. c Normalized R xy (T) curve and three fitting curves based on the mean field theory J = 1, J = ∞, and the spin wave theory, respectively. Three magnetic regimes exist from 2 K to TC = 191 K. Regime I (2~10 K) is an unknown phase requiring further investigation. Regime II (10~155 K) is a hard ferromagnetic phase. Regime III (155~191 K) is a phase with zero coercivity and remanence. d The temperature dependence of coercivity from 2 to 150 K
