Abstract:Measurements of the complex initial permeability of several specimens of Mumetal (77% Ni, 14% Fe, 5% Cu, 4% Mo) have been made from 0-30 MHz. The samples were polycrystalline rings 50 μm in thickness; the mean grain size ranged from 9 μm to 140 μm. The results were analysed in terms of the domain model previously employed by the authors in 1969 and 1970, yielding the following main conclusions.Despite the low anisotropy (of order 100 erg cm−3), there exists a well-defined domain structure. Except near the surf… Show more
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