The magnetic properties of commercial polycrystalline Nd2Fe14B （N50M,N45H,N40SH,N35EH） and Sm2Co17（XG30/20,XG26/25,XG22/20） magnets at cryogenic temperatures were tested by using a comprehensive physical propertie...The magnetic properties of commercial polycrystalline Nd2Fe14B （N50M,N45H,N40SH,N35EH） and Sm2Co17（XG30/20,XG26/25,XG22/20） magnets at cryogenic temperatures were tested by using a comprehensive physical properties measurement system （PPMS）. The results show that the spin tilt temperature Tst of Nd2Fe14B magnets is closely related to intrinsic coercivity Hci , N50M and N45H with smaller Hci show a residual magnetization jump at 235K and 225K, respectively. For Sm2Co17 magnets, in 50-300 K, with temperature decreasing, residual magnetization Mrc shows a nearly linear increase, while in 10-50 K, Mrc has little change. The research results provide a reference for cryogenic undulators and other high-precision cryogenic devices.展开更多
基金the Natural Science Foundation of Shanghai,China(Grant No.11ZR1445500)the National Natural Science Foundation of China(Grant No.11175238)
文摘The magnetic properties of commercial polycrystalline Nd2Fe14B （N50M,N45H,N40SH,N35EH） and Sm2Co17（XG30/20,XG26/25,XG22/20） magnets at cryogenic temperatures were tested by using a comprehensive physical properties measurement system （PPMS）. The results show that the spin tilt temperature Tst of Nd2Fe14B magnets is closely related to intrinsic coercivity Hci , N50M and N45H with smaller Hci show a residual magnetization jump at 235K and 225K, respectively. For Sm2Co17 magnets, in 50-300 K, with temperature decreasing, residual magnetization Mrc shows a nearly linear increase, while in 10-50 K, Mrc has little change. The research results provide a reference for cryogenic undulators and other high-precision cryogenic devices.
