Journal of East China Normal University(Natural Sc ›› 2014, Vol. 2014 ›› Issue (6): 67-72.doi: 10.3969/j.issn.10005641.2014.06.010

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Influence of vacuum annealing on the GMI effect of Co81.5Fe4.5Mo2B12 microwires

 ZHANG  Heng-Guang, LI  Xin, RUAN  Jian-Zhong, CHEN  De-Lu, ZHAO  Zhen-Jie   

  1. Department of Physics, East China Normal University, Shanghai 200062, China
  • Online:2014-11-25 Published:2015-02-07

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Abstract: Co81.5Fe4.5Mo2B12 microwires were prepared by the TaylorUlitovsky method. Influence of the vacuum annealing conditions on Giant Magnetoimpedance (GMI) effect and its symmetrical properties were studied. The results show that the GMI ratio increases firstly and then decreases with the increase of the annealing temperature. The highest GMI ratio was obtained when the temperature is 250 ℃. The symmetry of the GMI curves of the microwires may be improved after proper annealing. When the annealing temperature is 330 ℃, GMI symmetry of the microwire was deteriorated may be caused by the decrease of the magnetic anisotropy.

Key words: GMI (Giant magnetoimpedance), microwires, hysteresis, vacuum annealing

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