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Chinese Physics, 2001, Vol. 10(9): 862-868    DOI: 10.1088/1009-1963/10/9/318
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

ANISOTROPIC CHARACTERISTICS OF DEMAGNETIZATION CURVE FOR NANOCRYSTALLINE Nd-Fe-B MAGNET CALCULATED BY MICROMAGNETICS

Jin Han-min (金汉民), Wang Xue-feng (王学凤), Zhao Su-fen (赵素芬), Yan Yu (闫羽)
Department of Physics, Jilin University, Changchun 130023, China
Abstract  The demagnetization curves for nanocrystalline Nd-Fe-B magnets of a stoichiometric composition were calculated by making use of the finite element technique of micromagnetics. The curve, especially iHc, varies in a wide range with the direction of applied field if the grain number N is taken to be small. With the increase of N, the range becomes smaller and the average of iHc decreases and approaches a limit iHc(= ∞). iHc for finite N is larger than, or at least equal to, iHc(= ∞). Jr/Js is weakly affected by N and the field direction. Jr/Js(= ∞) decreases with the increase of grain size L. These are larger than the experimental values for the Nd-rich Nd2.33Fe14B1.06Si0.21 magnets by ~0.05. iHc(= ∞) increases with the increase of L, and is close to or somewhat smaller than the experimental values of the Nd-rich magnet, as would be expected. In contrast, the curve calculated for the non-interacting grain system (Stoner-Wohlfarth model) of ≥ 30 depends neither on the field direction nor on N.
Keywords:  rare-earth Fe compound      high coercive force materials      magnetization curves      hysteresis loop      micromagnetism  
Received:  16 December 2000      Revised:  13 February 2001      Accepted manuscript online: 
PACS:  75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)  
  02.70.Dh (Finite-element and Galerkin methods)  
  75.50.Tt (Fine-particle systems; nanocrystalline materials)  
  75.30.Gw (Magnetic anisotropy)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 59871019).

Cite this article: 

Jin Han-min (金汉民), Wang Xue-feng (王学凤), Zhao Su-fen (赵素芬), Yan Yu (闫羽) ANISOTROPIC CHARACTERISTICS OF DEMAGNETIZATION CURVE FOR NANOCRYSTALLINE Nd-Fe-B MAGNET CALCULATED BY MICROMAGNETICS 2001 Chinese Physics 10 862

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