Synthesis of magnetic nanocomposites and alloys from platinum-iron oxide core-shell nanoparticles.

Academic Article

Abstract

  • This paper presents a systematic study on the generation of iron platinum-containing magnetic nanocomposites and alloys from Pt@Fe(2)O(3) core-shell nanoparticle precursors. These core-shell nanoparticles were made using a sequential synthetic approach. They could form FePt alloys and alloy-containing nanocomposites through a solid-state reaction at >400 °C. The chemical compositions of FePt alloys were controllable by using Pt@Fe(2)O(3) core-shell nanoparticles that had the designed Pt core diameter and iron oxide shell thickness. We show that face-centred tetragonal (fct) FePt@Fe core-shell nanoparticles could be made from Pt@Fe(2)O(3) core-shell nanoparticles with 5% hydrogen in argon (v/v). Furthermore, various FePt alloys and alloy-containing nanocomposites including metastable intermediate phases could be obtained. The materials were characterized by high resolution scanning transmission electron microscopy (HR-STEM), energy dispersive x-ray (EDX) spectroscopy, powder x-ray diffraction (PXRD), parallel electron energy loss spectroscopy (PEELS), and superconducting quantum interference device (SQUID) magnetometry. These materials could have potential applications as permanent hard magnets and data storage media.
  • Authors

  • Teng, Xiaowei
  • Yang, Hong
  • Status

    Publication Date

  • July 2005
  • Published In

  • Nanotechnology  Journal
  • Keywords

  • Bioengineering
  • Nanotechnology
  • Digital Object Identifier (doi)

    Pubmed Id

  • 21727477
  • Start Page

  • S554
  • End Page

  • S561
  • Volume

  • 16
  • Issue

  • 7