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The domain structures of Mn, MnZn, Ni, Cu and Ba ferrite crystals have been examined by the conventional and modified Bitter figure techniques. In the cases of Mn, Ni and Ba ferrites the patterns observed are in accordance with the nature of their magnetic constants. The MnZn ferrite crystal examined gave anomalous patterns considered to be due to a strain induced uniaxial anisotropy.
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Craik et al. (1959) studied this question.
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