The (BH) max value of the sintered NdFeB magnet is 5 to 15 times higher than sintered ferrite magnets. Hcj value is 5 to 10 times higher than sintered ferrite and 6 to 10 times higher than AINiCo magnets. The potential magnetic properties of NdFeB magnets are very high. Theoretically, their (BH) max value can be reached to 527 kJ/m³(66MGOe). They can even attract object which weight is 640 times heavier than themselves.