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Magnetization and Intrinsic Coercivity for τ-phase Mn₅₄Al₄₆/α-phase Fe₆₅Co₃₅ Composite

Journal of Magnetics, Volume 19, Number 1, 31 Mar 2014, Pages 55-58

Jihoon Park (Department of Electrical and Computer Engineering and MINT Center, the University of Alabama), Yang-Ki Hong *

(Department of Electrical and Computer Engineering and MINT Center, the University of Alabama), Jaejin Lee (Department of Electrical and Computer Engineering and MINT Center, the University of Alabama), Woncheol Lee (Department of Electrical and Computer Engineering and MINT Center, the University of Alabama), Chul-Jin Choi (Korea Institute of Materials Science), Xia Xu (Department of Chemical and Biological Engineering and MINT Center, the University of Alabama), Alan M. Lane (Department of Chemical and Biological Engineering and MINT Center, the University of Alabama)

Abstract

We have synthesized ferromagnetic τ-phase Mn₅₄Al₄₆/α-phase Fe₆₅Co₃₅ composite by annealing a mixture of paramagnetic ε-phase Mn₅₄Al₄₆ and ferromagnetic α-phase Fe₆₅Co₃₅ particles at 650 ^oC. The volume fraction ( f_h) of hard τ-phase Mn₅₄Al₄₆ of the composite was varied from 0 to 1. During the annealing, magnetic phase transformation occurred from paramagnetic ε-phase to ferromagnetic τ-phase Mn₅₄Al₄₆. 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

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

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