Abstract
Ferrites properties depend very strongly on the chemical composition and on the microstructure. The complex permeability spectra of Cu substituted Ni-Zn ferrites produced by conventional ceramic process for high frequency were studied. The experimental and theoretical curves of real and complex permeability were compared. Is discussed the contribution of the domain wall and of the spin rotational motion on the complex permeability in the MHz region. A small amount of Cu ions can provide high performances to the Ni-Zn ferrite.
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