a neodymium arc magnets arranged in a fixed direction

magnetic grates component is iron, cobalt, nickel and other atoms, and its internal structure of the atom is rather special, itself has a magnetic moment. Magnet Type: Shape class Magnet: Magnet block, tile-shaped magnets, shaped magnets, cylindrical magnet, ring magnets, disc magnets, magnetic magnets, magnetic frame magnet magnet properties: samarium cobalt magnets, NdFeB magnets, ferrite magnets, alnico magnets, iron-chromium-cobalt magnets, industry magnet: magnetic components, motor magnets, rubber magnets, powerful magnets, plastic magnetic, and so kind. Permanent magnets and soft magnet points, plus the permanent magnet is magnetic, so thatus the electron spin angular momentum of a neodymium arc magnets  arranged in a fixed direction