SmCo , the second generation permanent magnet, with high magnetic energy product and much lower temperature coefficient, can reach a maximum working temperature of 350°C and no limits in negative temperature。When working in a temperature over 180°C，the maximum magnetic energy product,temperatuture stability and chemical stability of SmCo are all much better than NdFeB.Also,with advantages of strong anticorrosion and antioxidation,it is widely used in aviation, national defense , microwave devices,communications,medical equipment,instruments,meters,varities of magnetic transmission device, Motors, magnetic crane ,etc.