... third generation of Rare Earth Magnet, it is the strongest magnets in the world at present, its maximum energy product is ... . NdFeB magnet is hard and brittle. Because the surface of Neodymium magnets is very easy to be rusted and oxidated in the ... receiver, microphone, alarm, stage audio, car audio.Electrical and electronic: permanent magnetic actuator of vacuum circuit breaker, magnetic keep relay, a ...