Wide-scale evolution of magnetization distribution in ultrathin films

We show, combining simulations and analytical study, the evolution of magnetization distributions in ultrathin film with in-plane fields (H-parallel to) and changes of magnetic anisotropy characterized by the quality factor, Q. Reconstruction of the distributions and their new types near Q or H-parallel to-induced reorientation phase transitions, from a domain structure (DS) with perpendicular magnetization into a state with in-plane magnetization, are reported. Sinusoidal-like DS exist for H-parallel to larger than the anisotropy field and for Q<1. A minimal 8pil(ex) DS period is predicted (l(ex) is the exchange length).