Structural, Spectroscopic, Dielectric, and Magnetic Properties of Cu-Co–Co-substituted Manganese Soft Ferrites.

A series of Cu-Co-substituted manganese ferrites (Mn_1-xCu_xFe_2-yCo_yO₄; x = 0.0–0.1, y = 0.00–0.25) were synthesized via microemulsion method. The values of structural parameters, i.e., lattice constant and crystallite size, were increased with the inclusion of Co and Cu ions. FTIR studies revealed first band at 400–500 cm⁻¹ and second band at 561–588 cm⁻¹. The values of dielectric parameters have been increased with the increase of Cu and Co concentrations. The magnetic parameters, i.e., saturation magnetization (M_s), coercivity (H_c), and remanence (M_r), have been investigated from M-H loops. The values of M_s and M_r were observed to increase from 5.00 to 36.02 emu/g and from 4.6 to 13.2 emu/g, respectively. The value of coercivity had been decreased from 466 to 261 Oe. The increase in saturation magnetization as well as decrease in dielectric losses proposed that synthesized nanoferrites may be potential candidates for high frequency and microwave applications. [ABSTRACT FROM AUTHOR]