Local Structure of Directly Synthesized L10 FePt Nanoparticles

Kozo Shinoda, Kimitaka Sato, Balachandran Jeyadevan, Kazuyuki Tohji

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The FePt particles synthesized by polyol process using tetraethylene glycol (TEG) as reducing agent at reaction temperatures 200 °C and 300 °C are superparamagnetic and ferromagnetic, respectively. The crystal structure of these particles is analyzed using XRD, XAS, and ASAXS to understand the formation of these particles at different heating temperatures. The results suggest that at 200 ° C particles with Pt rich FePt core and amorphous shell rich in Fe are formed. However, when the reaction solution is annealed at 300 °C, sintering of several small particles occur. On the other hand, when hexachloroplatinum as nucleation control agent and a carboxylic acid as complex agent was added into the reaction solution, homogeneous alloy FePt particles with relatively large grain size of about 8 nm were obtained. In the process of forming the alloy nanoparticles, precipitated small particles were sintered at the amorphous interface and crystallization progresses along with ordering resulting in the formation of partially ordered ferromagnetic FePt.

Original languageEnglish
Pages (from-to)3051-3053
Number of pages3
JournalIEEE Transactions on Magnetics
Volume42
Issue number10
DOIs
Publication statusPublished - 2006

Keywords

  • ASAXS
  • fcc-FePt
  • fct-FePt
  • polyol process
  • XAFS

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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