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Size variation in the range of macro to nano can bring difference in electrical chemical and magnetic properties of any materials Hence technical properties of nanoparticles are significantly different from their bulk counterpart which makes them commercially and technologically important Nanoparticles of ferrites are widely explored in making the recording devices permanent magnets electric motors automotive traction because of its high coercivity and saturation magnetization These properties can be modified by changing their chemical composition and micro structural characteristics which can be controlled during fabrication and synthesis processes Ferrite nanoparticles are also applied in chemical reactions due to their catalytic photo catalytic and photo electrochemical properties 270 271 Among the ferrites cobalt ferrites are known for their efficient separation after the completion of reactions reusability and magnetic recyclability Moreover high coercivity and moderate magnetization properties of cobalt ferrite make it as a well known hard magnetic material also These properties along with their great physical and chemical stability create CoFe2O4 nanoparticles suitable for magnetic recording applications such as audio and video tape and high density digital recording disks etc 272 274 Cobalt ferrite and nickel ferrite have high and low magneto crystalline anisotropy constant respectively 275 277
