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Chinese Physics, 2006, Vol. 15(2): 449-453    DOI: 10.1088/1009-1963/15/2/036
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Influence of magnetic field sweep rate on the hysteresis loops of Ni0.8Fe0.2/Fe0.5Mn0.5 exchange bias bilayer

He Ke (何珂)
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract  The influence of the magnetic field sweep rate on the hysteresis loops of exchange bias Ni$_{0.8}$Fe$_{0.2}$/Fe$_{0.5}$Mn$_{0.5}$ bilayers has been investigated with a vibrating sample magnetometer. It was found that the sweep rate of 13.6 kA/4$\pi $ms is high enough to bring about obvious changes in the hysteresis loops of the exchange bias bilayer. High sweep rate in the magnetization reversal stage enlarges the coercivity of the sample, while high sweep rate in the saturation state reduces the coercivity. The above phenomena were attributed to magnetic viscosity in the ferromagnetic layer enhanced by the interface exchange interaction and domain magnetization reversals assisted by thermal fluctuation in the antiferromagnetic layer respectively.
Keywords:  exchange bias      coercivity      sweep rate      magnetic viscosity      Fulcomer--Charap model  
Received:  17 August 2005      Revised:  31 October 2005      Accepted manuscript online: 
PACS:  75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))  
  75.50.-y (Studies of specific magnetic materials)  
  75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)  
  75.60.Jk (Magnetization reversal mechanisms)  
  75.30.Et (Exchange and superexchange interactions)  

Cite this article: 

He Ke (何珂) Influence of magnetic field sweep rate on the hysteresis loops of Ni0.8Fe0.2/Fe0.5Mn0.5 exchange bias bilayer 2006 Chinese Physics 15 449

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