Local structural studies of directly synthesized L10 FePt nanoparticles by using XRD, XAS and ASAXS

K. Shinoda, K. Sato, B. Jeyadevan, K. Tohji, S. Suzuki

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The FePt particles synthesized by polyol process using tetraethylene glycol (TEG) at 200 and 300 °C are superparamagnetic and ferromagnetic, respectively. The crystal structure and atomic distribution of the particles are analyzed using XRD, X-ray absorption spectroscopy and anomalous small angle X-ray scattering to understand the formation of these particles under different synthesis conditions. The results suggest that at 200 °C particles with Pt-rich FePt core and Fe-rich amorphous shell are formed. When the reaction solution is heated to 300 °C, sintering of several small particles occur. On the other hand, when H2PtCl6 as nucleation control agent and succinic acid as complex agent were added to the reaction solution, homogeneous FePt alloy particles with grain size of 8 nm were obtained. In the process of forming the alloy nanoparticles, small particles get 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)2387-2389
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 3
DOIs
Publication statusPublished - 2007 Mar 1

Keywords

  • ASAXS
  • Disordered FCC
  • Metal alloy
  • Ordered FCT
  • XAFS

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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