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High-coercivity FePt nanoparticle assemblies embedded in silica thin films.

Q Yan1, A Purkayastha, A P Singh

  • 1Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.

Nanotechnology
|May 7, 2009
PubMed
Summary

We developed a scalable thin film technique to embed FePt nanoparticle assemblies in silica. Annealing creates high-coercivity magnetic films, suitable for advanced data storage and magneto-composites.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Thin Film Technology

Background:

  • Scalable processing of nanoparticle assemblies is crucial for device fabrication.
  • FePt nanoparticles exhibit promising magnetic properties but require controlled assembly and phase transformation.
  • Thin film techniques offer potential for manufacturing magnetic nanostructures.

Purpose of the Study:

  • To embed FePt nanoparticle assemblies into a silica thin film using scalable sol-gel processing.
  • To investigate the structural and magnetic properties of the composite thin film after annealing.
  • To assess the potential of these films for data storage and magneto-composite applications.

Main Methods:

  • Sol-gel processing to embed FePt nanoparticle assemblies within a silica matrix.

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  • Annealing the silica-FePt thin film composite at 650°C.
  • Characterization of the phase transformation from fcc to fct FePt and assessment of magnetic coercivity (H(c)).

    • Main Results:

    • Successful embedding of FePt nanoparticle assemblies in silica thin films.
    • Annealing induced the phase transformation to the magnetically hard fct FePt phase.
    • Achieved high magnetic coercivity values (H(c) > 630 mT) with retained particle order.
    • Silica host protected nanoparticle assemblies during high-temperature annealing.

    Conclusions:

    • Sol-gel processing combined with annealing is an effective method for creating high-coercivity FePt nanoparticle assemblies in thin films.
    • The resulting films demonstrate potential for ultra-high-density data storage devices.
    • These magnetic thin films are promising for advanced magneto-composite applications.