  Theoretical prediction of Curie temperature (TC) is of vital importance for
designing the spintronic devices in two-dimensional (2D) ferromagnetic
materials. Herein, based on the extensive investigation of Monte Carlo
simulations, we summary and propose an improved method to estimate TC more
precisely, which includes the different contributions of multiple near-neighbor
interactions. Taking monolayer CrI3 as an example, the trends of TC with
biaxial strain are investigated via Monte Carlo simulations, mean-field
formulas and our method. Besides, our method is not only accurate and
convenient to predicting the TC in 2D ferromagnetic honeycomb lattice CrI3 but
it can be extended for predicting the TC of other 2D lattices. Our work paves
the way to accelerate the prediction and discovery of novel 2D ferromagnets for
spintronic applications.
