Monte Carlo Studies of the Effect of Anisotropy on Curie Temperature of 2D Heisenberg Spin Models in Honeycomb Lattices

Both anisotropic exchange and single-ion anisotropy can stabilize long-range magnetic order in 2D van der Waals (vdW) materials. In this study, we use Monte Carlo simulations to determine how Curie temperature (T_c) depends on the two kinds of anisotropy in 2D Heisenberg spin models in honeycomb lattices, which can represent many 2D vdW materials. Understanding T_c dependence on anisotropy helps to discover high-T_c 2D magnetic materials desired in a wide range of potential applications such as spintronic devices.