Monte Carlo study of binary alloy ferromagnetic nanoparticle under time-dependent magnetic field

Abstract

In this work, the Monte Carlo simulation has been used to study the dynamic magnetic properties of a binary alloy ferromagnetic nanoparticle with radius R of the type A p B 1 − p in a time-dependent oscillating magnetic field. The system consists of two different species of magnetic components, namely, A and B with spins S A = 1 / 2 and S B = 3 / 2 , respectively. The effect of the A atom concentration on the dynamic hysteresis loops and on the specific absorption rate (SAR) of the system are discussed for selected values of the period and the amplitude of the magnetic field. Our simulation results indicate that in the ferromagnetic state the dynamic hysteresis loops have greater area for low values of the temperature of the system and high amplitude of the time-dependent magnetic field. Furthermore, the SAR presents an exponential decay as the field period increases and it is more important for the system with small values of the concentration p and for higher values of the field amplitude.