Ferromagnetic Ordering in Lanthanum Substituted Nano-Cobalt Ferrites at Room Temperature

Abstract

The effect of Fe3+ ions substitution by rare earth La3+ ions on magnetic properties of nano crystalline cobalt ferrite is investigated and reported in this paper. Co-precipitation method was used to prepare ultrafine particles of CoLaxFe2-xO4 (x = 0, 0.10, 0.15). The samples have cubic spinel structure and average crystallite size of x = 0, x = 0.1 and x = 0.15 are 49.84 nm, 27.73 nm and 47.97 nm respectively. Structure has been investigated by XRD and TEM while magnetic properties have been studied using VSM and Mossbauer spectrometer. La3+ ions modulate significantly the magnetic properties of cobalt spinel ferrites.