Nano Research

, Volume 2, Issue 5, pp 380–385

Synthesis of high magnetic moment CoFe nanoparticles via interfacial diffusion in core/shell structured Co/Fe nanoparticles


  • Chao Wang
    • Department of ChemistryBrown University
  • Sheng Peng
    • Department of ChemistryBrown University
  • Lise-Marie Lacroix
    • Department of ChemistryBrown University
    • Department of ChemistryBrown University
Open AccessResearch Article

DOI: 10.1007/s12274-009-9037-4

Cite this article as:
Wang, C., Peng, S., Lacroix, L. et al. Nano Res. (2009) 2: 380. doi:10.1007/s12274-009-9037-4


We report the synthesis of high magnetic moment CoFe nanoparticles via the diffusion of Co and Fe in core/shell structured Co/Fe nanoparticles. In an organic solution, Co nanoparticles were coated with a layer of Fe to form a Co/Fe core/shell structure. Further raising the solution temperature led to inter-diffusion of Co and Fe and formation of CoFe alloy nanoparticles. These nanoparticles have high saturation magnetization of up to 192 emu/g CoFe and can be further stabilized by thermal annealing at 600 °C.


CoFe nanoparticlescore/shell nanoparticlesmagnetic nanoparticleschemical synthesis
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Supplementary material

12274_2009_9037_MOESM1_ESM.pdf (173 kb)
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© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2009