Assembly and patterning of ferromagnetic nanoparticles from solution: a novel low-temperature liquid-phase annealing approach

T. Gang, Maarten Groen, S.S. Kinge, W.J.M. Naber, J.A. Boschker, Augustinus J.H.M. Rijnders, David Reinhoudt, Wilfred Gerard van der Wiel

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Ferromagnetic L10-phase FePtAu nanoparticles (5–6 nm) were prepared using a low-temperature, liquid phase annealing approach. The chemically ordered, ferromagnetic L10-phase onset occurs for annealing temperatures as low as 150 ◦C. Large uniaxial magnetic anisotropy (Ku ∼107 erg/cm3) and a large longrange ordering parameter have been obtained. Significantly, the low-temperature liquid-phase annealing preserves the organic functionalization groups of the nanoparticles. Hence, these nanoparticles are flexible for further assembly and patterning. In addition, we present the assembly of FePt nanoparticles on ferromagnetic substrates with a thin alumina capping layer. This enables us to investigate spin dependent transport through the FePt nanoparticles by scanning tunneling microscopy.
Original languageUndefined
Pages (from-to)586-590
Number of pages5
JournalSynthetic metals
Issue number7-8
Publication statusPublished - Apr 2011


  • EWI-21090
  • Scanning tunneling microscopy
  • Spintronics
  • IR-79197
  • Magnetic nanoparticles
  • FePtAu
  • METIS-280032
  • Solution annealing

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