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
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
