Model for perpendicular hysteresis of thin magnetic films

In the present paper two already existing theoretical models of the magnetization reversal process are expanded. The model of rotational magnetization is applied to a two-dimensional array of ferromagnetic prisms. Supported by numerical calculations we can show that successive magnetization reversal of rows of columns is likely to occur resulting in oblique hysteresis loops. Expressions for both the reversal starting field and the coercivity are derived. The wall motion model is supplemented by considering 360° walls which are stable up to very high fields thereby avoiding thresholds for wall nucleation. On the other hand these walls contribute to the mean magnetization during approach to saturation. The theoretical results are compared with experimental loops of recently published papers.