If you are looking for a proper explanation of the rare earth magnet, you can have a precious understanding before you trying to search for further information. First of all, the rare earth magnet is a magnet made from alloys of rare earth elements. This kind of magnet is usually a type of strong permanent magnet, even the strongest magnet in 1970s and 80s. The misleading name “rare earth” is actually formed by mostly tin or lead, which is not as rare as you think.
Since the rare earth magnets are extremely brittle and vulnerable to corrosion, they are usually coated to protect them from breaking. And it can still be used in many fields, for example, it can be applied to the computer hard drives, audio speakers, bicycle dynamos, fishing reel brakes, self-powered flashlights, mag-lev trains and even electric guitar pickups. The value of the rare earth magnet has been noticed for centuries, and the price became competitive in the 1990s. Compare to the ferrite magnets, the rare earth magnet provides a greater strength and allows smaller as well as lighter magnets to various applications.