First of all, many people may wonder how long the magnetism of neodymium iron boron magnet can last. About this question, neodymium iron boron magnet has high coercive force, so generally, in the natural environment and the general conditions of magnetic field there would not be demagnetization or changes of magnetism. Assuming the environment is appropriate, even after a long time of use, the loss of magnetism will not be great. So in practical application, we often ignore the factor of time effect on the magnetic properties. But if working in harsh environments for a long time, the magnet can appear demagnetization as well.
So, what is the main influence factor of neodymium iron boron magnet’s magnetism? It is the environmental temperature. Since the sintered NdFeB is very sensitive to temperature, the instantaneous maximum temperature and sustained maximum temperature of environment may lead to different degrees of magnet demagnetization, including reversible and irreversible demagnetization, and recoverable and unrecoverable demagnetization.