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Chin. Phys. B, 2013, Vol. 22(7): 074101    DOI: 10.1088/1674-1056/22/7/074101

Experiment research on residual magnetization of rare earth permanent magnet for cryogenic undulator

He Yong-Zhou (何永周)
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
Abstract  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 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 235 K and 225 K, 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.
Keywords:  Nd2Fe14B and Sm2Co17      spin reorientation      residual magnetization      intrinsic coercivity  
Received:  05 December 2012      Revised:  18 January 2013      Accepted manuscript online: 
PACS:  41.60.Ap (Synchrotron radiation)  
  41.85.Lc (Particle beam focusing and bending magnets, wiggler magnets, and quadrupoles)  
  75.50.Ww (Permanent magnets)  
Fund: Project supported by the Natural Science Foundation of Shanghai, China (Grant No. 11ZR1445500) and the National Natural Science Foundation of China (Grant No. 11175238).
Corresponding Authors:  He Yong-Zhou     E-mail:

Cite this article: 

He Yong-Zhou (何永周) Experiment research on residual magnetization of rare earth permanent magnet for cryogenic undulator 2013 Chin. Phys. B 22 074101

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