In addition to Fe3O4, what are the biological magnetic materials?
Magnetic material from the material and structure, divided into metal and alloy, magnetic materials and ferrite magnetic materials two major categories, ferrite magnetic material is divided into polycrystalline structure and single crystal structure material.
The magnetic material is morphologically. It includes powder material, liquid material, block material, film material and so on. Magnetic material is widely used in electroacoustic, telecommunication, electric meter, motor, memory element, microwave component and so on. Magnetic tapes for recording language, music, image information, magnetic storage devices for computers, vouchers for passenger travel, magnetic cards for fare settlement, etc..
From the application function, the magnetic material is divided into: permanent magnet material, soft magnetic material, magnetic recording - moment magnetic material, spin magnetic material and so on. Soft magnetic materials, magnetic materials, magnetic recording materials in magnetic moment both metal material and ferrite material; and the rotating magnetic material and high-frequency soft magnetic materials is ferrite material, because the metal will produce large eddy current effect in high frequency and microwave frequency, resulting in metal magnetic material can not be used, and the resistivity of ferrite is very high, will effectively overcome this problem, widely used.
