Effects of structural disorder on the critical and hysteresis behaviours of nanoparticles with cubic structure

By means of Monte Carlo simulation, a systematic study is presented to reveal the effect of structural disorder on the critical and hysteresis behaviours of a Heisenberg ferromagnetic cubic structure. The atomic sites of the considered system are changed systematically from their regular positions by means of a disorder parameter, thereby allowing us to smoothly interpolate between regular and amorphous structures. We have shown that the critical temperature increases at threshold values of the disorder parameter. Moreover, we have found that the hysteresis loop’s area increases with increasing the structural disorder, thereby increasing the coercivity of the system. [Display omitted] •The Curie temperature increases as the system becomes more disorder.•The disordered structure was found to exhibits a reduced magnetization and enhanced coercivity.•As the system structural disorder raised, the magnetization per site curves was observed to magnetize faster.•The system coercivity and hysteresis loops area increase as the system structural disorder elevate.