Domain structures and magnetization processes of ultrathin ordered iron–gold alloys films

Abstract Thickness-dependent changes of the domain period, initial susceptibility and saturation field in ultrathin films was theoretically analyzed considering the equilibrium state of the domain. The experiment was performed on artificially stabilized tetragonal-ordered gold–iron films with thickness varying from 3 up to 50 monolayers. Domain structure and magnetization processes were studied using magneto-optical techniques. Square hysteresis loops were registered for intermediate film thickness.