Magnetic hysteresis in thin ferromagnetic films

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Abstract
The magnetic hysteresis in thin ferromagnetic films with in plane anisotropy is described using a simple modification of the Stoner–Wohlfarth model of coherent rotations. Introducing an additional internal field results in very realistic shapes of hysteresis loops and removes the nonphysical singularities characteristic for coherent rotations. This additional field originates from the domain structure and represents the effect of incoherent rotations occurring during the magnetization process. The component of this field parallel to the external magnetic field determines the width of the hysteresis loop, while the perpendicular component defines the slope of the hysteresis loop and its squareness.