Thermal activation of magnetization in Pr2Fe14B ribbons

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

中国物理B ›› 2013, Vol. 22 ›› Issue (11): 117503-117503.doi: 10.1088/1674-1056/22/11/117503

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Thermal activation of magnetization in Pr₂Fe₁₄B ribbons

李柱柏, 沈保根, 钮萼, 刘荣明, 章明, 孙继荣

State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2013-06-02 修回日期:2013-07-19 出版日期:2013-09-28 发布日期:2013-09-28
基金资助:
Project supported by the Knowledge Innovation Project of the Chinese Academy of Sciences and the National Basic Research Program of China.

Thermal activation of magnetization in Pr₂Fe₁₄B ribbons

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)

State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2013-06-02 Revised:2013-07-19 Online:2013-09-28 Published:2013-09-28
Contact: Shen Bao-Gen E-mail:shenbg@iphy.ac.cn
Supported by:
Project supported by the Knowledge Innovation Project of the Chinese Academy of Sciences and the National Basic Research Program of China.

摘要/Abstract

摘要： 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.

关键词: thermal activation, magnetization reversal, fluctuation field, aftereffect field

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.

Key words: thermal activation, magnetization reversal, fluctuation field, aftereffect field

中图分类号: (Magnetization reversal mechanisms)

75.60.Jk

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

李柱柏, 沈保根, 钮萼, 刘荣明, 章明, 孙继荣. Thermal activation of magnetization in Pr₂Fe₁₄B ribbons[J]. 中国物理B, 2013, 22(11): 117503-117503.

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[J]. Chin. Phys. B, 2013, 22(11): 117503-117503.

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Thermal activation of magnetization in Pr₂Fe₁₄B ribbons

Thermal activation of magnetization in Pr₂Fe₁₄B ribbons

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