Nd–Fe–B-Based Sintered Magnet

Sintered magnets based on neodymium (Nd), iron (Fe) and boron (B) were invented in 1982. They exhibit the highest performance among the industrially manufactured magnets. Nd–Fe–B magnets not only show excellent magnetic properties but are suitable for mass production as well. Therefore, they are used for many applications, especially for high-performance motors. This chapter offers basic knowledge for understanding Nd–Fe–B-based sintered magnet, including general features, an Nd2Fe14B compound, phase diagram of Nd–Fe–B magnet, manufacturing process and efforts for realising high performance.