Magnetic and electrical properties of(Ni0.8Cu0.2)(1-x) CoxMn0.02Fe1.9O4 ferrites

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 d ecrement of density. The initial permeability changes linearly with the ave rage grain size of the materials and shows fairly good thermal stability fo r higher Co concentration. An appreciable increment in DC resistivity along with decrement in dielectric loss factor at 100 MHz can also be obtained f or higher Co concentration. (C) 2001 Elsevier Science B.V. All rights reser ved.