Mn 0.50-x Zn 0.50 Cu x Fe 2 O 4 ( where x = 0.0 - 0.3) ferrites have been synthesized by auto combustion method. X-ray diffrac tion patterns reveal that all compositions are of single phase cubic spinel structure. The lattice parameter decreases with the increase in Cu 2+ content obeying the Vegard’s law. The bulk density, average grain size, initial permeability, Néel temperature and saturation magnetic induction of Mn 0.50-x Zn 0.50 Cu x Fe 2 O 4 increased with increasing Cu 2+ content. It is ob served that both density and initial permeability increase with increasing sintering temperature. The maximum initial permeability is found to be 1061 which is almost four times greater than that of the parent composition. The resonance frequency of all the samples shifts towards the lower frequency as the permeability increases with Cu 2+ content. It is observed from B-H loops of Mn 0.50-x Zn 0.50 Cu x Fe 2 O 4 that coercivity decreases and retentivity increases with Cu 2+ content. Possible explanations for the observed magnetic properties with various Cu 2+ contents are discussed.
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