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Chin. Phys. B, 2013, Vol. 22(11): 117503    DOI: 10.1088/1674-1056/22/11/117503

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
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:

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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