Fig. 4
Temperature versus layer number phase diagram of the 2D layer ferromagnetic CrI3. a Temperature dependence of I. I. of the M2 magnon normalized to the value at 10 K as a function of layer number. The colored solid curves are fits to \(I_0 + I\sqrt {T_{\mathrm{C}} - T}\). The gray curve is the guide to the eye of the evolution of TC. Error bars correspond to the two SEs of normalized I. I. in the Lorentzian fits at individual temperatures for different thicknesses of 2D CrI3. b Temperature versus layer number phase diagram (PM for paramagnetism and FM for ferromagnetism). The size of the data points represents the M2 magnon lifetime. Error bars correspond to the two SEs of TC in the fits in a
