After one thousand years of development, the magnet has become a powerful material in our life today.
Through the synthesis of different material alloy can achieve the same effect as the tool, but also can improve the magnetic force.
Came in the 18th century artificial magnet, but the process of making stronger magnetic material is very slow, until the 1920 s to produce the aluminum nickel and cobalt.
Then produce the ferrite in the 1950 s, 70 s including producing rare earth magnet ndfeb, samarium cobalt.
At this point, magnetism obtained the rapid development of science and technology, strong magnetic material also makes the components more miniaturization.