Magnetic and electrical properties of (Ni0.8Cu0.2)1−x Cox Mn0.02Fe1.9O4 ferrites

Abstract The effect of Co substitution on the magnetic and electrical properties of iron-deficient nickel–copper mixed ferrites containing a small quantity of manganese oxide was investigated. The presence of Co enhances the specific magnetization although the saturation magnetization falls a little due to decrement of density. The initial permeability changes linearly with the average grain size of the materials and shows fairly good thermal stability for higher Co concentration. An appreciable increment in DC resistivity along with decrement in dielectric loss factor at 100 MHz can also be obtained for higher Co concentration.