Neodymium-iron-boron composition of Nd2Fe14B is a permanent magnetic material with metallic composite of Nd2Fe14B as the base. Compared with the casting of Al-Ni-Co permanent magnetic materials and permanent magnetic ferrite，neodymium-iron-boron has stronger coercive force and （BH）max，which can attract heavy objects weighing 640 times its weight. Its merit of higher energy density results in its widely application in modern industry and electronic technology, which makes the small size, light weight and thin set of instruments, audio and engines, magnetic separation and magnetizing equipment a possibility.

These alloys have a com-position of two rare earth atoms to 14 iron atoms with one boron atom. There may be a substitution of other rare earth and/or minor additions of other elements. Known as third generation of Rare Earth magnets, Neodymium Iron Boron NdFeB magnets are the most powerful and advanced commercialized permanent magnet today. Since they are made from Neodymium, one of the most plentiful rare earth elements, and inexpensive iron, NdFeB magnets offer the best value in cost and performance.