Abstract
Polycrystalline Co0.50−xMnxZn0.5Fe2O4, with various amount of Mn substitution has been synthesized by conventional solid‐state reaction technique. Pellet and toroid‐shaped samples were prepared from each composition and sintered at different temperatures in air for 5 hours. The structural and surface morphology of the samples were characterized by X‐ray diffraction and high resolution optical microscope. Spinel structure is formed for all the samples. Lattice constants increase with increasing Mn content and obey the Vegard’s law. The microstructural study shows that both sintering temperatures and cations substitutions have great influence on the average grain size. The M‐H loops of all samples were measured. The studies of magnetic properties show that the saturation magnetization, Ms, strongly depends on the Mn content. Variation of complex permeability has been investigated over a wide range of frequency (100 kHz–100 MHz). The real part of the initial permeability, μi increases with increasing Mn content.
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