Magnetic Properties of Zn substituted Copper Ferrites

Abstract

The magnetic properties were studied for Cu1-x ZnxFe2O4 ferrites for x = 0, 0.4, prepared by standard double sintering ceramic
technique sintered at different sintering temperatures and characterized by X-Ray diffraction (XRD) technique. The single-phase cubic
spinel structure of all the samples has been confirmed from X-ray diffraction analysis. Magnetic properties have been measured as a
function of field using Vibrating Sample Magnetometer (VSM). It is well known that the distribution of cations in the tetrahedral Asites
and octahedral B-sites determines to a great extent the magnetic properties of ferrites. Curie temperatures TC of the studied ferrite
system has been determined from the μ'-T curves where Hopkinson type effect at the TC has been observed with the manifestation of
sharp fall of permeability. The sharp decrease of μ´ at T=TC indicates that the samples have high homogeneity according to Globus.
Curie temperature is found to decrease with Zn content and with increasing sintering temperature. The saturation magnetization (MS)
is found to increase with Zn content. The increase of magnetization is due to the dilution of magnetic moment of A sub-lattice by the
substitution of non-magnetic Zn ions.