What can the material of permanent magnets be divided?

　　Material of permanent magnets has wide hysteresis loop, high coercivity and high remanence, once through magnetizing, it is able to maintain constant magnetic materials. It is also called the hard magnetic material.

　　In the practical work, permanent magnet's material is in the second quadrant demagnetization part in deep saturation and after magnetizing the hysteresis loop . Used permanent magnet's material is aluminum nickel and cobalt permanent magnetic alloys, of iron chromium cobalt permanent magnetic alloy, ferrite permanent magnet, rare earth permanent magnet materials and composite permanent magnetic material.

　　Aluminum nickel cobalt permanent magnetic alloy makes iron, nickel and aluminum element as a main component, also containing copper, cobalt, titanium and other elements. It has high remanence and low temperature coefficient, magnetic properties. It consists of cast alloy and powder sintered alloy . In 30 ~ 60 times of twentieth Century , it has more applications, is now used for instrumentation manufacturing of magnetoelectric meter, flow meter, micro motor, relay.