Hard ferrite, also called ferrite magnets, the electrical characteristics for, the resistivity of ferrite than metal alloy magnetic materials, and they are more High dielectric performance. Ferrite magnetic can also have a higher performance in the high freqency magnetic condutivity. Therefore, ferrite has become weak electric fields using high frequency wide range of nonmetallic magnetic material way. Now hard ferrite is widely used in all kind of electronic, electrical, receiver, sensors, medical apparatus, microwave communication equipment, etc...