Magnet, also called magnetic steel. Magnets are generally divided into two categories, one is soft magnets and the other is permanent magnets; soft magnets include silicon steel sheets and soft magnetic cores; hard magnets include alnico, samarium cobalt, ferrite and neodymium iron boron. Among them, the most expensive is samarium cobalt magnet, the low-priced is ferrite magnet, and the highest performance is neodymium iron boron magnet, but the one with the most stable performance and best temperature coefficient is alnico magnet. Users Different hard magnetic products can be selected according to different needs.