Neodymium, samarium, praseodymium, dysprosium, and other materials are the main raw materials for manufacturing modern permanent magnet materials. Neodymium iron boron has 4-10 times higher magnetism than ordinary permanent magnet materials and is known as the "king of permanent magnets". By replacing other permanent magnet materials with it, the volume and weight of the device can be reduced exponentially, resulting in a wide range of applications. At present, the main application areas include permanent magnet motors, generators, nuclear magnetic resonance imaging machines, magnetic separators, audio speakers, magnetic transmission, magnetic lifting, instrumentation, liquid magnetization, magnetic therapy equipment, medical equipment, acoustic and electrical equipment, maglev trains, and military industry, etc. It has become an indispensable functional material for automobile manufacturing, general machinery, electronic information industry, and cutting-edge technology.