Neodymium magnet, also known as NdFeB magnet, is a Tetragonal crystal system crystal formed by Nd2Fe14B. In 1982, Sumitomo special metal Masato Sagawa discovered Neodymium magnet. The magnetic energy product (BHmax) of this magnet was larger 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, while General Motors successfully developed the melt spraying process, which can prepare neodymium iron boron magnets. This kind of magnet is a permanent magnet whose magnetism is second only to Absolute zero holmium magnet, and it is also the most commonly used Rare-earth magnet. Neodymium iron boron magnets are widely used in electronic products, such as hard drives, mobile phones, headphones, and battery powered tools.

To avoid corrosion damage, it is necessary to perform protective treatment on the surface of permanent magnet materials during use, such as electroplating with gold, nickel, zinc, tin, and spraying epoxy resin on the surface.