| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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The Impact Induced Demagnetization Mechanism in NdFeB Permanent Magnets |
| LI Yan-Feng1,3, ZHU Ming-Gang1**, LI Wei1, ZHOU Dong1, LU Feng2, CHEN Lang2, WU Jun-Ying2, QI Yan3, DU An3 |
1Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081
2State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081
3College of Science, Northeastern University, Shenyang 110819
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| Cite this article: |
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LI Yan-Feng, ZHU Ming-Gang, LI Wei et al 2013 Chin. Phys. Lett. 30 097501 |
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Abstract Compression of unmagnetized Nd2Fe14B permanent magnets is executed by using shock waves with different pressures in a one-stage light gas gun system. The microstructure, crystal structure, and magnetic properties of the magnets are examined with scanning electronic microscopy, x-ray diffraction, hysteresis loop instruments, and a vibrating sample magnetometer, respectively. The NdFeB magnets display a demagnetization phenomenon after shock wave compression. The coercivity dropped from about 21.4 kOe to 3.2 kOe. The critical pressure of irreversible demagnetization of NdFeB magnets should be less than 4.92 GPa. The coercivity of the NdFeB magnets compressed by shock waves could be recovered after annealing at 900°C and 520°C for 2 h, sequentially. The chaotic orientation of Nd2Fe14B grains in the compressed magnets is the source of demagnetization.
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Received: 07 April 2013
Published: 21 November 2013
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| PACS: |
75.50.Ww
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(Permanent magnets)
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75.50.Vv
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(High coercivity materials)
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81.40.Ef
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(Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization)
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