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http://dx.doi.org/10.4283/JMAG.2014.19.1.055

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)
Publication Information
Journal of Magnetics / v.19, no.1, 2014 , pp. 55-58 More about this Journal
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.
Keywords
permanent magnet; magnetic composites; exchange coupling; Mn-Al; Fe-Co;
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