Cobalt ferrite (CoFe2O4) is a promising material due to its exceptional ferrelectric, optical, electronic and magnetic properties that are most important for device applications. The oxides with spinel structure are interesting materials responsible for useful device applications due to their promising chemical and physical properties achievable in accommodation of foreign citations. Partial substitution of iron with transition metals might play an important role to improve its different properties useful in various applications. Degree of crystallinity, particle size, electrical...