Monte Carlo study of ternary alloy magnetic nanoparticle in presence of time dependent magnetic field

In the present work, we have studied the magnetic behavior of a ternary alloy nanoparticle of the form ABpC1−p by Monte Carlo simulations. The nanoparticle was modeled by three types of magnetic sites, A-sites with spin-3/2, B-sites with spin-1 and C-sites with spin-5/2, distributed in a simple cubic lattice. The magnetic behavior was modeled by means of a Hamiltonian including ferromagnetic coupling between the A and B sites and antiferromagnetic coupling between the A and C sites, in presence of a time dependent magnetic field. We have observed the nanoparticle radius dependence of the critical temperature. We have also computed the saturation magnetization for different values of p and compare it with the theoretical value. On the other hand, dynamic phase transitions were computed for different period and amplitude values of the time dependent magnetic field. Furthermore, dynamic hysteresis loops were obtained in order to calculate the specific absorption rate, which was found to exhibit an exponential decay as the field period increases. Finally, in all the cases, the specific absorption rate was found to be higher for high values of p.