From long long ago, humans began to use the magnet materials.
The spring and autumn period and the warring states period has been find lodestone sex suction with lron and guidelines.
Modern human magnetic materials according to use can be divided into permanent magnetic materials, magnetic materials, magnetic recording materials and magnetic materials with special functions.
Roughly divided into three categories: for everybody paramagnetic substances, diamagnetic material and ferromagnetic material.
Paramagnetic material after being magnetized strength is very weak, and the direction of the magnetic field of magnetic field, magnetic almost completely disappeared after the external magnetic field is removed.
Diamagnetic material after magnetization intensity is weak, the magnetic field direction contrary to the original magnetic field direction, magnetic almost completely disappeared after the external magnetic field is removed.
Ferromagnetic material is strong magnetic material, after being magnetized strength is very strong, and the direction of the magnetic field and magnetic field, from the external magnetic field, magnetic still remaining part of this material is usually called magnetic materials.
Magnetic materials according to the ease of demagnetization after magnetization can be divided into two categories: easy to remove after magnetization of magnetic material is called soft magnetic materials, not easy after magnetization demagnetization substance called hard magnetic materials.
Permanent magnet materials have a variety of purposes: (1) based on the application of the electromagnetic principle mainly include: the speaker, microphone, meters, buttons, motors, relays, sensors, switches, etc.
(2) based on the application of the magnetoelectric effect principle mainly include: magnetron microwave tube and traveling wave tube, tube, titanium pump, microwave ferrite devices, magnetic resistance device, hall device, etc.
(3) based on the application of magnetic mechanism mainly include: magnetic bearings, separator, magnetic separator, magnetic chuck, magnetic seal, magnetic blackboard, toys, signs, combination lock, copy machine, temperature control meter, etc.
Other applications include: magnetic therapy, such as magnetized water, magnetic anesthesia.
The function of soft magnetic materials with lron mainly permeability, transformation and transmission of electromagnetic energy.
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