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Domain arrangements are studied and values of the N-S surface energy parameter δ are determined by applying model calculations available in the literature. Using Sharvin's experimental arrangement, δ0 = 54 nm is obtained. Magnetization curves are measured and for certain applied fields the mechanism of flux intrusion is investigated by domain observations. The large irreversibilities observed for nearly defect-free specimens are analyzed in terms of recent theories on the transition into the intermediate state.
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Eßmann et al. (1977) studied this question.
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