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The high-frequency permeabilities of several NiZn ferrite films prepared by spray plating were investigated up to 6GHz. An adaptation of the Bouchaud–Zérah effective medium model provided an analytical expression for the microwave permeability, with a simple dependence on the magnetization distribution. An excellent agreement with the experimental results was obtained, in the demagnetized state as well as in the remnant state.
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Acher et al. (2009) studied this question.
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