Rare Earth Magnetic materials

Magnetic material refers to the material that produces strong magnetism to the external magnetic field. The material THAT CAN make some WAY REACTION to magnetic field is called magnetic material. According to the strength of magnetism shown in the external magnetic field, it can be divided into diamagnetic material, paramagnetic material, ferromagnetic material, anti-ferromagnetic material and ferromagnetic material. Most materials are diamagnetic or paramagnetic, which are less responsive to external magnetic fields. Ferromagnetic materials and ferromagnetic materials are strong magnetic materials, usually referred to as magnetic materials refers to strong magnetic materials. Magnetic materials are divided into permanent magnet materials and soft magnetic materials. Magnetic materials are generally divided into permanent magnet materials and soft magnetic materials according to the degree of difficulty of magnetization. Permanent magnet material is also known as permanent magnetic material or hard magnetic material, refers to the magnetic flux density and magnetic polarization strength with high coercivity of magnetic material, it through magnetization to saturation, remove the external magnetic field is still magnetic. Soft magnetic material refers to the magnetic material with low coercivity and high permeability, easy to magnetize, and easy to demagnetize. Permanent magnetic materials include metal permanent magnetic materials, permanent ferrite and rare earth permanent magnetic materials. The rare earth permanent magnet materials have passed through the first generation of SmCo5 permanent magnet, the second generation of Sm2Co17 permanent magnet, and the third generation of ND-FE-B permanent magnet, which is mainly used at present. The soft magnetic materials mainly include ferrite soft magnetic materials and metal soft magnetic materials, in which the metal soft magnetic materials include traditional alloy soft magnetic materials, metal magnetic powder core, amorphous and nanocrystalline alloy soft magnetic materials.