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

doi:10.1088/1674-1056/22/7/074101

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 T_st of Nd₂Fe₁₄B magnets is closely related to intrinsic coercivity H_ci, N50M and N45H with smaller H_ci show a residual magnetization jump at 235 K and 225 K, respectively. For Sm₂Co₁₇ magnets, in 50-300 K, with temperature decreasing, residual magnetization M_rc shows a nearly linear increase, while in 10-50 K, M_rc 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: heyongzhou@sinap.ac.cn

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

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