Angular dependence of coercivity of grains in nanocrystalline permanent magnets
Gong Yi-Min(龚依民)a), Lan Zhi-Huan(蓝志环)a), Yan Yu(闫羽)a),Du Xiao-Bo(杜晓波)a)†, Wang Wen-Quan(王文全)a), Wang Xue-Feng(王学凤)a), Su Feng(苏峰)a), Lu Lei(卢磊)a), Zhang Zhi-Sheng(张之胜)a),Jin Han-Min(金汉民)a), and Wen Ge-Hui(温戈辉)b)
a Department of Physics, Jilin University, Changchunrm 130023, China; b State Key Laboratory of Superhard Material, Jilin University, Changchun 130023, China
Abstract In this paper magnetization remanence curves were studied for nanocrystalline Pr8Fe87B5, Pr12Fe82B6 and Pr15Fe77B8. Initially the sample was at remanence following saturation along $z$-axis. After rotating the magnet by $5n$ degrees ($n$=0, 1, ..., 18) a field H was applied along $z$-axis and then decreased to zero, and the remanence $J_r^n$ was measured as a function of $H$. The curves were compared with those calculated based on the nucleation of reverse domain model and domain wall pinning model. The latter model succeeds in simulation much better than the former, and it is concluded that the magnetization reversal is dominated by domain wall pinning for all the samples. The nucleation mechanism contribution, while remains small, increases with the increase of Pr content.
Received: 03 April 2007
Revised: 18 July 2007
Accepted manuscript online:
PACS:
75.60.Ej
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: Project supported by Department of Science
and Technology of Jilin Province, China.
Cite this article:
Gong Yi-Min(龚依民), Lan Zhi-Huan(蓝志环), Yan Yu(闫羽), Du Xiao-Bo(杜晓波), Wang Wen-Quan(王文全), Wang Xue-Feng(王学凤), Su Feng(苏峰), Lu Lei(卢磊), Zhang Zhi-Sheng(张之胜), Jin Han-Min(金汉民), and Wen Ge-Hui(温戈辉) Angular dependence of coercivity of grains in nanocrystalline permanent magnets 2008 Chin. Phys. B 17 1130
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