Structures made of infinitely long planar strips of magnetic film whose infinite dimensions are all parallel are considered, and the field needed to magnetize them to a given extent normal to that dimension is specified. An exact analytic solution is given for partially saturated coplanar films. Some useful analytic approximations and a computer program are described for solving more general structures, including results for a sandwich of a current-carrying conductor between two parallel film strips.
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R. Berger (1968) studied this question.
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