中国物理B ›› 2001, Vol. 10 ›› Issue (12): 1157-1162.doi: 10.1088/1009-1963/10/12/315

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EFFECT OF α-Fe SURFACE LAYER ON THE MAGNETIC REVERSION PROCESS FOR Nd2Fe14B CRYSTAL

赵素芬, 金汉民, 王学凤, 闫羽   

  1. Department of Physics, Jilin University, Changchun 130023, China
  • 收稿日期:2001-02-13 修回日期:2001-07-10 出版日期:2001-12-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 59871019).

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)   

  1. Department of Physics, Jilin University, Changchun 130023, China
  • Received:2001-02-13 Revised:2001-07-10 Online:2001-12-15 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 process for a Nd2Fe14B grain covered by an α-Fe layer was studied by use of the finite element technique of micromagnetics. μ0iHc decreases with the increase of α-Fe layer thickness t. With the increase of t from 0 to 6nm, μ0iHc 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 α-Fe layer and the field direction.

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.

Key words: hysteresis loop, permanent magnet, micromagnetics

中图分类号:  (Magnetization curves, hysteresis, Barkhausen and related effects)

  • 75.60.Ej
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)