Classification, performance characteristics and uses of magnetic materials:
1 Ferrite magnetic material: Generally refers to the corresponding oxide of iron oxide and other metal oxides. They are mostly ferrimagnetic. Features: The resistivity is much higher than that of metal, about 1-10 (12th power) ohm / cm, so the vortex loss and skin effect are small, suitable for high frequency use. Low saturation magnetization is not suitable for high magnetic density applications. The Curie temperature is relatively low.
2 Ferromagnetic materials: refers to materials with ferromagnetic properties. Examples include iron-nickel-cobalt and its alloys, and alloys of certain rare earth elements. Below Curie temperature, the material has a large magnetization when external magnetic is applied.
3 Ferrimagnetic material: refers to materials with ferrimagnetism, such as various ferrites, below the Nair temperature, the material has a large magnetization when external magnetic is added.
4 Permanent magnet material: The magnet is thicker when it is magnetized. The external magnetic field still has strong magnetism, which is characterized by high coercive force and large magnetic energy product. Can be divided into aluminum nickel cobalt, rare earth cobalt, neodymium iron boron and so on. Ferrite permanent magnets, such as barium ferrite, strontium ferrite, other permanent magnets, such as plastic magnet.
5 Soft magnetic materials: materials that are easy to magnetize and demagnetize. Mn-Zn ferrite soft magnetic material, its working frequency is between 1K-10M. Ni-Zn ferrite soft magnetic material, the working frequency is generally 1-300MHZ.
6 Metal soft magnetic material: Compared with ferrite, it has high saturation magnetic induction strength and low coercive force, such as engineering pure iron, iron aluminum alloy, iron cobalt alloy, iron nickel alloy, etc., and it is often used in transformers.