Anisotropic Heisenberg model with dipolar interactions: Monte Carlo simulations of the planar-to-paramagnetic phase transition in a bilayer system

In this work we used extensive Monte Carlo simulations and finite-size scaling theory to study the planar-to-paramagnetic phase transition in the dipolar-anisotropic Heisenberg model in a bilayer system. This model is a prototype to describe ferromagnetic thin films. Our results suggest that this is an order-disorder phase transition that might belong to another universality class characterized by a nondivergent specific heat (α≈-0.4) and the critical exponents ν=1.22(9), γ=2.1(2), and β=0.18(5).