In the last years, the study of the antiferromagnetic-ferromagnetic interfaces was a very exciting topic in the thin film area. Using the Monte Carlo technique (by applying the standard Metropolis algorithm) and the extended Heisenberg model with low dipolar interaction, the influence of the antiferromagnetic base layer on the magnetic properties of the multilayer thin film is investigated, in the ferromagnetic region of the phase diagram of the system. For each ferromagnetic layer individually, we study the physical quantities of interest (assuming particular physical conditions): the out-of-plane magnetization, the magnetic susceptibility and the specific heat and we point out the Ising-like ordering of the magnetic spins. The obtained numerical results show that the critical temperature of the individual layers decreases as we approach the base antiferromagnetic layer and consequently, the stability of the ferromagnetic phase increases with the distance from the base layer.
In this paper the magnetic behavior of triple layer thin film was investigated by Monte Carlo simulations. We fixed an antiferromagnetic arrangement of the lattice spins for the basal layer of the film and we studied the basal layer magnetic ordering influence on the two other layers, by calculating the out-of-plane and the in-plane magnetization, the out-of-plane and the in-plane magnetic susceptibility and the specific heat. We found out five magnetic ordering phases of the sample: ferromagnetic, antiferromagnetic, mixed phase ordering, paramagnetic and XY-like magnetic ordering of the spins, respectively.
The magnetism of the layered materials attracts a great interest in the last years. In this context, it is necessary to take into account the anisotropic comportment of this kind of systems, due to its important influence on the magnetic properties that characterize these structures. In this paper, we intend to study in a numerical manner the effect of the temperature dependence of the anisotropic parameters on the specific behavior of a two-dimensional square lattice of unitary magnetic spins. Thus, using the Monte Carlo technique, we calculate the magnetic susceptibility and the specific heat of the considered physical system governed by a Heisenberg type Hamiltonian and we determine the magnetic properties of the system, induced by the temperature dependence of anisotropy that characterizes the thin film. In this context, we point out a slow decrease of the critical temperature specific to the ferromagnetism-paramagnetism phase transition, in comparison with the case of constant anisotropy. We also detect a critical temperature slight decrease along with the increasing slope of the anisotropy linear variation as a function of temperature.
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