Thermal activation of magnetization in Pr2Fe14B ribbons

doi:10.1088/1674-1056/22/11/117503

Abstract The aftereffect field of thermal activation, which corresponds to the fluctuation field of a domain wall, is investigated via specific measurements of the magnetization behavior in Pr₂Fe₁₄B nanocrystalline magnets. The thermal activation is a magnetization reversal arising from thermal fluctuation over an energy barrier to an equilibrate state. According to the magnetic viscosity and the field sweep rate dependence of the coercivity, the calculated values of the fluctuation field are lower than the aftereffect field and in a range between those of domain walls and individual grains. Based on these results, we propose that the magnetization reversal occurs in multiple ways involving grain activation and domain wall activation in thermal activation, and the thermal activation decreases the coercivity by ～ 0.2 kOe in the Pr₂Fe₁₄B ribbons.

Keywords: thermal activation magnetization reversal fluctuation field aftereffect field

Received: 02 June 2013
Revised: 19 July 2013
Accepted manuscript online:

PACS:	75.60.Jk	(Magnetization reversal mechanisms)
	75.50.Vv	(High coercivity materials)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	75.60.Lr	(Magnetic aftereffects)

Fund: Project supported by the Knowledge Innovation Project of the Chinese Academy of Sciences and the National Basic Research Program of China.

Corresponding Authors: Shen Bao-Gen
E-mail: shenbg@iphy.ac.cn

Cite this article:

Li Zhu-Bai (李柱柏), Shen Bao-Gen (沈保根), Niu E (钮萼), Liu Rong-Ming (刘荣明), Zhang Ming (章明), Sun Ji-Rong (孙继荣) Thermal activation of magnetization in Pr₂Fe₁₄B ribbons 2013 Chin. Phys. B 22 117503

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Thermal activation of magnetization in Pr₂Fe₁₄B ribbons