The material of permanent magnets has a variety of uses

　　The material of permanent magnets has a variety of uses.

　　Firstly, based on the principle of electromagnetic force application: it is mainly used in speaker, microphone, meter, keys, motor, relay, sensor, switch.

　　Secondly, based on magnetoelectric effect principle of application, it is mainly used in the magnetron and the travelling wave tube microwave electron tubes, the tubes, titanium pump, microwave ferrite devices, magnetic devices, such as Holzer device.

　　Thirdly, based on the principle of the magnetic force application, it is mainly used in: magnetic bearing, separator, magnetic separator, magnetic sucker, magnetic seal, magnetic blackboard, toys, signs, password lock, copier, temperature control meter. Other aspects of the application are: magnetic, magnetic water, magnetic anesthesia.

　　According to the use need, materials of permanent magnets can have different structures and morphologies. Some materials have the difference of the isotropic and anisotropic.