Modeling of the blocking temperature of a system of core/shell nanoparticles

Abstract

A theoretical study was conducted on the size dependence of the blocking temperature Tb of a system of interacting core/shell nanoparticles. A method for estimating the blocking temperature of interacting core/shell nanoparticles is presented, which allows Tb to be calculated more precisely than using the “Neel relation”. It was shown that with an increase in the intensity of the magnetostatic interaction (concentration of nanoparticles), the blocking temperature increases, while the growth of the external magnetic field leads to the opposite effect. Moreover, the Tb of large nanoparticles changes more significantly. Comparing different approaches, we identify a precise method for determining the blocking temperature from ZFC and FC magnetization curves.