Acta Metall Sin  1988, Vol. 24 Issue (5): 425-430    DOI:

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MAGNETIC DOMAIN STRUCTURES AND RELATED MAGNETIC PROPERTIES OF (NdPr)_(16)Fe_(76)B_8 PERMANENT MAGNET

WANG Ruikun;SUN Lihong;LI Dongpei;YING Qiming;T. TAKEYAMA General Research Institute for Non-Ferrous Metals; Beijing

WANG Ruikun;SUN Lihong;LI Dongpei;YING Qiming;T. TAKEYAMA General Research Institute for Non-Ferrous Metals; Beijing. MAGNETIC DOMAIN STRUCTURES AND RELATED MAGNETIC PROPERTIES OF (NdPr)_(16)Fe_(76)B_8 PERMANENT MAGNET. Acta Metall Sin, 1988, 24(5): 425-430.

Abstract References Related Articles Recommended Metrics Download:  PDF(1569KB)  Export:  BibTeX | EndNote (RIS)       Abstract  In a thermally demagnetized state, the matrix grains in (NdPr)_(16)Fe_(76)B_8 permanent magnet, in general, are the multidomain structure, i. e., 180°plate-like individual domain and a few spike-like or mazelike domains. The averagewidth of domains is measured as 1.5μm. The grain size of single-domain is observedto be some about 1μm and particularly up to 3μm. The calculated domainwall energy, γ=3.6 MJ/m~2, the exchange constant, A=4.5×10~(-11)J/m, the domainwall width, δ=15.7nm, and the critical grain diameter of single-domain, D_c=0.5μm. The dependence of high magnetic field gradient near grain boundaries on differentmagnetization direction in the adjacent magnetic domains on the both sides of grainboundaries as well as the effect of microstructure on the values of K, A and δwere also discussed. Key words:  Nd-Fe-B permanent magnet      domain structure      magnetic property      Received:  18 May 1988      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1988/V24/I5/425 1 Sagawa M, Fujimura S, Togawa N, Yamamoto H, Matsuura Y. J Appl Phys, 1984; 55: 2083 2 Sagawa M, Fujimura S, Yamamoto H, Matsuura Y, Hiraga K. IEEE Trans Magn, 1984; MAG-20: 1584 3 钟文定.铁磁学,(中册),科学出版社,1987 4 Livingston J D. J Appl Phys, 1985; 57: 4137 5 Sagawa M, Fujimura S, Yamamoto H, Matsuura Y, Hirasuwa S, Hiraga K. In: Proc 8th Int Workshop on Rare-Earth Magnets and their Applications, Dayton, 6-8 May, 1985: 587 6 Wang Ruikun (王瑞坤), Ying Qiming (应启明), Pan Shuming (潘树明). 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