Monte Carlo Study of first-order reorientation transitions in ferromagnetic thin film using short-time dynamics

P. S. PAGLIARO; G. P. SARACCO; M. A. BAB

Conferencia; IEEE virtual conference on magnetism, ATC-ATG; 2023

IEEE

The phase behavior of ferromagnetic thin films are studied by Monte Carlo simulations, modeling it as a classical two - dimensional anisotropic Heisenberg model with dipolar interactions. Its phase diagram presents a rich phenomenology that includes low - temperature phases characterized by perpendicular stripe - ordered or planar ferromagnetic domains, depending on anisotropy values, and high temperature paramagnetic one. To consider finite size effects, due to the cutoff in the range of dipolar interactions, periodic boundary conditions were implemented using Ewald sums. Furthermore, apropiated order parameters are defined with aim to determine the transition lines between the mentioned phases. The dynamic evolutions of the order parameters and their moments in the short-time regime is analyzed by fixing temperature and the ratio between the exchange and dipolar constants, δ = 1, and varying the ratio between the anisotropy and dipolar constants (η). In particular, the attention is focused on the first - order reorientation transition line where exist a longstanding controversy.