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Chinese Physics, 2001, Vol. 10(12): 1157-1162    DOI: 10.1088/1009-1963/10/12/315
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

EFFECT OF $\alpha$-Fe SURFACE LAYER ON THE MAGNETIC REVERSION PROCESS FOR Nd2Fe14B CRYSTAL

Zhao Su-fen (赵素芬), Jin Han-min (金汉民), Wang Xue-feng (王学凤), Yan Yu (闫羽)
Department of Physics, Jilin University, Changchun 130023, China
Abstract  The demagnetization process for a Nd2Fe14B grain covered by an $\alpha$-Fe layer was studied by use of the finite element technique of micromagnetics. $\mu$0iHc decreases with the increase of $\alpha$-Fe layer thickness t. With the increase of t from 0 to 6nm, $\mu$0iHc decreases from ~7 T to ~3.5 T when the angle between the applied field and the c-axis of the Nd2Fe14B grain is 0.5° and from ~4 T to ~1.5 T when the angle is 30° or 60°. The effect is only slightly affected by the angle between the $\alpha$-Fe layer and the field direction.
Keywords:  hysteresis loop      permanent magnet      micromagnetics  
Received:  13 February 2001      Revised:  10 July 2001      Accepted manuscript online: 
PACS:  75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)  
  75.40.Mg (Numerical simulation studies)  
  75.70.Rf (Surface magnetism)  
  75.50.Ww (Permanent magnets)  
  75.50.Bb (Fe and its alloys)  
  75.50.Vv (High coercivity materials)  
  61.72.Mm (Grain and twin boundaries)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 59871019).

Cite this article: 

Zhao Su-fen (赵素芬), Jin Han-min (金汉民), Wang Xue-feng (王学凤), Yan Yu (闫羽) EFFECT OF $\alpha$-Fe SURFACE LAYER ON THE MAGNETIC REVERSION PROCESS FOR Nd2Fe14B CRYSTAL 2001 Chinese Physics 10 1157

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