Static wall coercive force in ferromagnetic thin films

The static wall coercive force of thin ferromagnetic films has been calculated from a model of conservative wall energy. The spatial dependence of the wall energy γwis assumed to be given by the mean value of the local anisotropy energy, averaged over a coupling volume of the wall. The result of the calculation shows that where the structure constant includes the local anisotropy, is the mean diameter of a region with constant anisotropy (for instance crystallites), is the wall width; and is the coupling length parallel to the wall.