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By means of Monte Carlo simulation, a computational approach is proposed to investigate the surface roughness effects on the critical and hysteresis behaviors of Heisenberg ferromagnetic thin films. Here, the atomic sites of the film's surface are changed systematically from their regular positions using a disorder parameter, thereby allowing us to smoothly interpolate between smooth and rough surfaces. Threshold values of the structural disorder level at which the system critical temperature increases are identified. Furthermore, the surface roughness increases is observed to have a profound impact on the system's magnetic hysteresis loops. In particular, a significant increase in the loop's area is observed as the roughness increases, thereby increasing the coercivity of the thin magnetic film. [Display omitted] [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]