Fig. 2: Temperature dependence of the magnetism of 2L CrI₃ and 2L CrI₃/FL CrCl₃ heterostructure.

MOKE signal in the 2L CrI₃ region (a) and the 2L CrI₃/FL CrCl₃ heterostructure region (b) as a function of perpendicular magnetic field at different temperatures. Critical fields H₁, H₁^*, H₂^* and magnitudes in the change of MOKE signal ∆θ₁, ∆θ₁^*, ∆θ₂^* of magnetic transitions are labeled. c Temperature dependence of the critical fields of magnetic transitions. PM paramagnetic. The critical fields are extracted from the peak of derivative dθ_K/dH and the error bars are the peak widths. d Temperature dependence of the magnitudes in the change of MOKE signal at magnetic transitions. Solid curves are fitted by a power-law equation¹¹. The critical temperatures T_C and T_C^* are indicated. The error bars are the uncertainties in extracting the transition magnitudes.