In this paper, numerical techniques for simulation of magnetic domain structures of ferromagnetic materials using micromagnetics with large cells are investigated to save the computation cost. The exchange energy is modified to be applicable to large cells considering the angle between two neighboring cells. The demagnetizing energy is also modified to take account of erroneous magnetic surface charges which appear around the domain walls as a result of discretization. The method is then applied to a simple model and the result shows that an ideal vortex magnetic domain structure and domain wall motion can be represented.
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