Electricity and magnetism play a central role in operation of various nanotechnology devices such radio, receivers, televisions, electric motors, computers, high energy accelerators and most of electronic devices used in medicine. Scientists and researchers have worked hard to develop electromagnetic science and to find out theories to explain properties of the materials. Materials were classified into their interaction with applied magnetic field into diamagnetic, paramagnetic, ferromagnetic, antiferromagnetic and ferrimagnetic. Study of polycrystalline ferrites is important in view of their...