Los imanes eran no inventados por hombre, ellos son naturales magnetita. El antiguo griegos y chinos descubiertos a naturalmente magnetizados piedra en naturaleza, llamándolo el 22hierro-absorbente piedra". La piedra mágicamente recoge arriba pequeños piezas de hierro y siempre puntos en la misma dirección después balanceándose at voluntad. Temprano navegantes usados este imán as su antes brújula a discernimiento dirección en mar. El más temprano descubrimiento y uso de imanes debería ser chino, eso es, el uso de imanes para hacer "compasses", uno de los cuatro grandes inventos en China.
After thousands of years of development, today magnets have become a powerful material in our lives. By synthesizing alloys of different materials, the same effect as magnetite can be achieved, and the magnetic force can also be improved. Artificial magnets appeared in the 18th century, but the process of making stronger magnetic materials was very slow, until the 2020s of the 20th century made Alnicot (Alnico). Subsequently, ferrite (Ferrite) was produced in the 50s of the 20th century, and rare earth magnets [Rare Earth magnets, including NdFeB and samarium cobalt (SmCo)) were produced in the 70s. So far, magnetic technology has developed rapidly, and strong magnetic materials have also made components more miniaturized.
