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Synthesis, Structure and Magnetization Behaviors of MnBi/Fe3B/Nd2Fe14B Nanocomposite alloy

  • Yang, Y. ;
  • Wu, Q. ;
  • Hu, Y.C. ;
  • Zhang, P.Y. ;
  • Ge, H.L.
  • Received : 2015.12.28
  • Accepted : 2016.03.24
  • Published : 2016.06.30

Abstract

Microstructure and magnetization behaviors of $MnBi/Fe_3B/Nd2_Fe_{14}B$ nanocomposite alloy have been investigated. It was found that the coercivity increased firstly and then decreased, and saturation magnetization decreased with the additon of MnBi alloy. The addition of 40 wt.% MnBi powder enhanced the coercivity from 192.8 kA/m to 311.2 kA/m. The ${\delta}M$ and D(H)-H plots suggested the occurrence of a stronger exchange-coupling occurring between the hard and soft magnetic phase for this sample. The dependence of coercivity with temperature was discussed in 40 wt.% $Mn_{55}Bi_{45}$/ 60 wt.% $Nd_{4.5}Fe_{76.5}Nb_{0.5}B_{18.5}$ alloy powder, and a positive temperature coefficient was founded from 298 K to 350 K.

Keywords

nanocomposite alloy;coercivity;exchange coupling interaction

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Acknowledgement

Supported by : National Natural Science Foundation of China, Provincial Natural Science Foundation