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.
Received: 13 February 2001
Revised: 10 July 2001
Accepted manuscript online:
PACS:
75.60.Ej
(Magnetization curves, hysteresis, Barkhausen and related effects)
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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