Monte Carlo simulation of dynamic phase transition properties of core-shell magnetic nanoparticles with similar volumes

Abstract

We implement Monte Carlo simulations to determine dynamic phase transition features of both cubical and spherical nanoparticles composed of spin-1/2 cores surrounded by a spin-1 shell layer. The particles are subjected toan oscillating magnetic field. We plan these particles such that they have similar volumes. It is observed that the nonequilibrium magnetic phase transition temperatures of the particles with similar volumes explicitly depend on theirgeometrical shapes as well as the system parameters. The cubic one has a higher transition temperature than the spherical one for the small interface coupling, whereas the transition temperature of the spherical particle becomes higher thanthat of the cubic one with further increment in antiferromagnetic coupling. We also analyze the magnetic features of the particles, such as dynamic remanence and coercivity treatments. Our simulation results suggest that the sphericalparticle has almost the same coercivity behavior as the cubic one for some considered system parameters. However, there are some differences in the context of remanence behaviors between spherical and cubic core-shell nanoparticles.