Strong neodymium magnets
(Neodymium magnets), also known as NdFeB magnets, are tetragonal crystals formed by neodymium, iron, and boron (Nd2Fe14B). In 1982, Masayoshi Sagawa of Sumitomo Special Metals discovered neodymium magnets. The magnetic energy product (BHmax) of this kind of magnet is greater than that of the samarium cobalt magnet, and it was the material with the largest magnetic energy product in the world at that time. Later, Sumitomo Special Metals successfully developed the powder metallurgy process, and General Motors successfully developed the melt-spinning process, which can prepare neodymium iron boron magnets. Strong neodymium magnet
are permanent magnets with magnetism second only to absolute zero degree holmium magnets, and they are also the most commonly used rare earth magnets. Strong neodymium magnets
are widely used in electronic products, such as hard drives, mobile phones, earphones, and battery-powered tools.
In order to avoid corrosion damage, it is necessary to do a protective treatment on the surface of the permanent magnet material during use, such as electroplating with gold, nickel, zinc, tin, and spraying epoxy resin on the surface.