Experimental research on the residual magnetization of a rare-earth permanent magnet for a cryogenic undulator |
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| Authors: | He Yong-Zhou |
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| Affiliation: | Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China |
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| 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 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. |
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| Keywords: | Nd2Fe14B and Sm2Co17 spin reorientation residual magnetization intrinsic coercivity |
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