Tunnelling magnetoresistance in disordered interacting nanoparticles

Abstract

Tunnelling magnetoresistance (TMR) of three-dimensional disordered ferromagnetic nanoparticles has been studied based on the Monte Carlo (MC) simulations. The dipolar interaction as well as the exchange coupling between the particles are carefully considered. It is found that the maximum TMR is nearly independent of the dipolar interaction, while it decreases with an increasing exchange interaction. The numerical results also reveal that the magnetic field sensitivity of the TMR depends not only on the interactions but also on the distributions of the anisotropy axes.