中国物理B ›› 2001, Vol. 10 ›› Issue (6): 555-557.doi: 10.1088/1009-1963/10/6/317

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INTER-GRAIN EXCHANGE INTERACTION FOR SINGLE-PHASE NANOCRYSTALLINE Nd-Fe-B MAGNETS

王学凤, 金汉民, 赵素芬, 闫羽   

  1. Department of Physics, Jilin University, Changchun 130012, China
  • 收稿日期:2000-11-13 修回日期:2001-01-04 出版日期:2001-06-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 59871019).

INTER-GRAIN EXCHANGE INTERACTION FOR SINGLE-PHASE NANOCRYSTALLINE Nd-Fe-B MAGNETS

Wang Xue-feng (王学凤), Jin Han-min (金汉民), Zhao Su-fen (赵素芬), Yan Yu (闫羽)   

  1. Department of Physics, Jilin University, Changchun 130012, China
  • Received:2000-11-13 Revised:2001-01-04 Online:2001-06-15 Published:2005-06-12
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 59871019).

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摘要： The demagnetization curve as a function of intensity of the inter-grain exchange interaction was calculated for single-phase nanocrystalline Nd-Fe-B magnets by use of the finite-element technique of micromagnetics. Also, the strength of the exchange interaction was estimated as a function of the Nd content x for the nanocrystalline NdxFe94-xB6 magnets by comparing the above result with the experimental relation between iHc and x for the magnets. We found that the inter-grain exchange interaction decreases with the increase of x, are ≈70% and ≈60% of the inter-grain exchange interaction for x=15.5(μ0iHc≈2.0T) and x=19(μ0iHc≈2.3T), respectively.

Abstract: The demagnetization curve as a function of intensity of the inter-grain exchange interaction was calculated for single-phase nanocrystalline Nd-Fe-B magnets by use of the finite-element technique of micromagnetics. Also, the strength of the exchange interaction was estimated as a function of the Nd content x for the nanocrystalline NdxFe94-xB6 magnets by comparing the above result with the experimental relation between iHc and x for the magnets. We found that the inter-grain exchange interaction decreases with the increase of x, are ≈70% and ≈60% of the inter-grain exchange interaction for x=15.5($\mu$0iHc≈2.0T) and x=19($\mu$0iHc≈2.3T), respectively.

Key words: hysteresis loop, high coercivity materials, rare earth permanent magnet, exchange interaction, micromagnetics

中图分类号:  (Fine-particle systems; nanocrystalline materials)

  • 75.50.Tt
75.50.Ww (Permanent magnets) 75.40.Mg (Numerical simulation studies) 75.50.Vv (High coercivity materials) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 02.70.Dh (Finite-element and Galerkin methods)