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http://dx.doi.org/10.3938/jkps.73.1703

Magnetic properties of Mn54Al46C2.44/Sm2Fe17N3 and Mn54Al46C2.44/Fe65Co35 composites  

Qian, Hui-Dong (Powder and Ceramic Division, Korea Institute of Materials Science)
Si, Ping-Zhan (Powder and Ceramic Division, Korea Institute of Materials Science)
Lim, Jung Tae (Powder and Ceramic Division, Korea Institute of Materials Science)
Kim, Jong-Woo (Powder and Ceramic Division, Korea Institute of Materials Science)
Park, Jihoon (Powder and Ceramic Division, Korea Institute of Materials Science)
Choi, Chul-Jin (Powder and Ceramic Division, Korea Institute of Materials Science)
Publication Information
Journal of the Korean Physical Society / v.73, no.11, 2018 , pp. 1703-1707 More about this Journal
Abstract
Ferromagnetic ${\tau}-phase$ $Mn_{54}Al_{46}C_{2.44}$ particles were synthesized, and its composites with commercial $Sm_2Fe_{17}N_3$ and synthesized $Fe_{65}Co_{35}$ powders were fabricated. Smaller grain size than the single domain size of the $Mn_{54}Al_{46}C_{2.44}$ without obvious grain boundaries and secondary phases is the origin for the low intrinsic coercivity. It was confirmed that the magnetic properties of the $Mn_{54}Al_{46}C_{2.44}$ can be enhanced by magnetic exchange coupling with the hard magnetic $Sm_2Fe_{17}N_3$ and soft magnetic $Fe_{65}Co_{35}$. The high degrees of the exchange coupling were verified by calculating first derivative curves. Thermo-magnetic stabilities of the composites from 100 to 400 K were measured and compared. It was demonstrated that the $Mn_{54}Al_{46}C_{2.44}$ based composites containing $Sm_2Fe_{17}N_3$ and $Fe_{65}Co_{35}$ could be promising candidates for future permanent magnetic materials with the proper control of purity, magnetic properties, etc.
Keywords
MnAl; Composite magnet; Exchange coupling;
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