Permanent magnetic materials are materials that have wide hysteresis loops, high coercivity, and high remanence, and can maintain constant magnetic properties once they are magnetized. Also known as hard magnetic materials. In practice, the permanent magnet material works in the second quadrant demagnetization part of the magnetic hysteresis loop after deep magnetic saturation and magnetization. Commonly used permanent magnet materials are divided into Al-Ni-Co-based permanent magnet alloys, Fe-Cr-Co-based permanent magnet alloys, permanent magnet ferrites, rare earth permanent magnet materials and composite permanent magnet materials.
Soft magnetic material, a magnetic material with low coercivity and high permeability. Soft magnetic materials are easy to magnetize and demagnetize, and are widely used in electrical and electronic equipment. The most commonly used soft magnetic materials are iron-silicon alloys (silicon steel sheets) and various soft ferrites.
①The main applications based on the principle of electromagnetic force are: speakers, microphones, meters, buttons, motors, relays, sensors, switches, etc.
②Applications based on the principle of magnetoelectric action mainly include: microwave electron tubes such as magnetrons and traveling wave tubes, picture tubes, titanium pumps, microwave ferrite devices, magnetoresistive devices, Hall devices, etc.
③Applications based on the principle of magnetic force mainly include: magnetic bearings, concentrators, magnetic separators, magnetic chucks, magnetic seals, magnetic blackboards, toys, signs, password locks, photocopiers, thermometers, etc. Other applications include: magnetic therapy, magnetized water, magnetic anesthesia, etc.
Mainly used for magnetic antennas, inductors, transformers, magnetic heads, earphones, relays, vibrators, TV deflection yokes, cables, delay lines, sensors, microwave absorbing materials, electromagnets, accelerators, high-frequency acceleration cavities, magnetic field probes, magnetic substrates , Magnetic field shielding, high-frequency quenching energy accumulation, electromagnetic chuck, magnetic sensitive components (such as magneto-caloric materials as switches), etc.
