Fig. 3: Temperature dependence of the enhanced Zeeman effects in WS2/FePS3 heterostructures.
From: Ferromagnetism emerged from non-ferromagnetic atomic crystals
a, d Temperature dependent spin splitting for the bilayer a and trilayer d WS2 on FePS3 (versus on SiO2 as a reference), under 5 T magnetic field. Below 120 K, the spin splitting for WS2 on FePS3 is drastically enhanced. Above 120 K, spin splitting for WS2 on FePS3 restores to the intrinsic Zeeman splitting as on SiO2. b, e Magnetic field dependent spin splitting for the bilayer b and trilayer e WS2 on FePS3 at 7 K and 80 K, respectively. For both bilayer and trilayer WS2 on FePS3,  the enhanced Zeeman effects do not show a notable difference between 7 K and 80 K, implicating the application potentials above liquid nitrogen temperature. c, f Magnetic field dependent spin splitting for the bilayer c and trilayer f WS2 on FePS3 at 130 K. Above Néel temperature (~ 120 K) of the FePS3 substrate, the previously observed enhanced Zeeman effects disappear. The large noise in (c and f) compared with the intrinsic Zeeman effect at the lower temperature (e.g., Fig. 2f, g) is due to the thermal smearing of the spin-polarized bands at elevated temperatures. Error bars in a–f represent the uncertainty of the fitted reflectance dip positions.
