MICROSTRUCTURAL, MAGNETIC, AND ELECTRICAL PROPERTIES OF Co-Zn FERRITES NANOPARTICLES PREPARED BY SOL-GEL METHOD

The mixed ferrite nanometric Co-Zn ferrites [Co1-xZnxFe2O4] with x = 0; x = 0.35; x = 0.5; x = 0.65, and x = 1 having particle size down to similar to 20 nm, synthesized through chemical sol-gel route have been found to have higher Curie temperature and higher resistivity as compared to the ones derived from conventional processes. Studies were made to estimate the e r ect of Co concentration (x) on these mixed ferrite nanometric Co-Zn ferrites having a AB(2)O(4)-type cubic inverse spinel structure. Investigation of magnetic properties of all Co-Zn nanoferrites with varying Co content has been made using a VSM at room temperature. The saturation magnetization and coercive field have been observed to be highest for x = 0.35 and x = 0, respectively. The magneto-impedance characteristics and the complex impedance spectroscopy [Zd(omega, T) - Z' + iZ"-have also been investigated in detail for all the samples at di r erent frequencies.