Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Magnetization and Intrinsic Coercivity for τ-phase Mn54Al46/α-phase Fe65Co35 Composite

  • Park, Jihoon (Department of Electrical and Computer Engineering and MINT Center, the University of Alabama) ;
  • Hong, Yang-Ki (Department of Electrical and Computer Engineering and MINT Center, the University of Alabama) ;
  • Lee, Jaejin (Department of Electrical and Computer Engineering and MINT Center, the University of Alabama) ;
  • Lee, Woncheol (Department of Electrical and Computer Engineering and MINT Center, the University of Alabama) ;
  • Choi, Chul-Jin (Korea Institute of Materials Science) ;
  • Xu, Xia (Department of Chemical and Biological Engineering and MINT Center, the University of Alabama) ;
  • Lane, Alan M. (Department of Chemical and Biological Engineering and MINT Center, the University of Alabama)
  • Received : 2013.11.04
  • Accepted : 2014.03.03
  • Published : 2014.03.31
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Abstract

We have synthesized ferromagnetic ${\tau}$-phase $Mn_{54}Al_{46}/{\alpha}$-phase $Fe_{65}Co_{35}$ composite by annealing a mixture of paramagnetic ${\varepsilon}$-phase $Mn_{54}Al_{46}$ and ferromagnetic ${\alpha}$-phase $Fe_{65}Co_{35}$ particles at $650^{\circ}C$. The volume fraction ($f_h$) of hard ${\tau}$-phase $Mn_{54}Al_{46}$ of the composite was varied from 0 to 1. During the annealing, magnetic phase transformation occurred from paramagnetic ${\varepsilon}$-phase to ferromagnetic ${\tau}$-phase $Mn_{54}Al_{46}$. The magnetization and coercivity of the composite monotonically decreased and increased, respectively, as the $f_h$ increased. These results are in good agreement with our proposed composition dependent coercivity and modified magnetization equations.

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References

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