Magnetic nanoparticles of CoFe2O4 and CoFe1.4 Ga0.6 O4 have been synthesized by coprecipitation route. The FTIR spectra of CoFe2-xGaxO4 (x: 0.6 and 0.6 at 500°C) ferrite system was carried out in a KBr medium. Particle size as estimated by full width half maximum (FWHM) of the strongest x-ray diffraction (XRD) peak were found in the range of 22-35 ± 4 nm. SEM images reveal that the sample surface exhibit well defined crystalline nanoparticles of spherical shapes with small agglomeration. Energy dispersive x- ray (EDAX) analysis confirms the presence of Co, Fe, Ga and oxygen compounds in the prepared nanoparticles. TEM was used to characterize the microstructure of the samples and particle size determination, which exhibited the formation of spherical nanoparticles.