Nanoparticle composites: FePt with wide-band-gap semiconductor

Meihua Lu, H. Gong, T. Song, Jianping Wang, Hong Wei Zhang, T. J. Zhou

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We present a simple way to synthesize FePt and ZnO (wide-band-gap semiconductor) nanoparticle composites. The FePt nanoparticles were fabricated using the method reported by Sun et al. By controlling the heating rate, 3 nm FePt nanoparticles were synthesized. Well-dispersed FePt and ZnO nanoparticle composites were prepared by further adding zinc acetate and oleyl amine into the 3 nm FePt nanoparticle dispersion. By controlling the molar ratio of the FePt and zinc acetate, FePt and ZnO nanoparticle composites with different FePt particle fractions were obtained. The intensity of photo luminescence spectra of the nanoparticle composites increases very much with decreasing FePt particle fraction, whereas the peak position shifts a little. After annealing at 550 °C for half an hour, the nanoparticle composites become magnetically hard or semi-hard with coercivity much dependent on the FePt particle volume fraction. The coercivity of the composites increases with annealing temperature. The composites hold the promise of applications in new generation recording and/or optical devices.

Original languageEnglish (US)
Pages (from-to)323-328
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume303
Issue number2 SPEC. ISS.
DOIs
StatePublished - Aug 2006

Keywords

  • FePt
  • Nanoparticle composite
  • Wide-band-gap semiconductor

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