Effect of Co content on magnetic features and SPIN states IN Ni–Zn spinel ferrites

Abstract

The manuscript contains data on the effect of the Co content on the magnetic properties of Zn0·3Ni0·7Fe2O4 spinels, in which Ni2+ ions are partially substituted by Co2+ ions. Ferrites were produced via solid-state reaction from a mixture of oxides. All samples are single-phase with a spinel-type structure (SG: Fd-3m). The linear increase in the lattice parameters with increasing cobalt content was explained by the difference in ionic radii Co2+/Ni2+. The effect of the Co2+ content on the magnetic characteristics of Ni–Zn ferrites was established. Curie temperature decreased from 419 °C to 326 °C with increasing Co content from x = 0.0 to 0.7, respectively. At the same time, an increase in Ms; Mr and Hc was observed due to the larger magnetic moment of the Co2+ ion in comparison with Ni2+. Non-linear concentration dependence of the magnetic characteristics was discussed in terms of the Co2+ spin states.