L10 type ordered phase formation in Fe-Au nanoparticles

Kazuhisa Sato, Bo Bian, Yoshihiko Hirotsu

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Nanoparticles of L10-type ordered "FeAu", which does not exist in the equilibrium phase diagram, have been fabricated by annealing Fe/Au nano-complex particles with sizes of 20-30 nm. The structure of the nanoparticles was investigated by transmission electron microscopy. After annealing the Fe/Au particles with a mean composition of Fe-22 at% Au, Au-rich (more than 32at%) and Au-poor (less than 16 at%) regions were formed in most of the particles. The (110) lattice fringes of the L10-type structure were frequently observed in the Au-rich regions where a dark contrast was always observed. The specimen showed ferromagnetic properties and its coercivity was increased up to about 40 kA/m by annealing. The formation of the ferromagnetic L10-FeAu phase was discussed.

Original languageEnglish
Pages (from-to)L1-L3
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume41
Issue number1 A/B
DOIs
Publication statusPublished - 2002 Jan 15
Externally publishedYes

Keywords

  • Alloying
  • Atomic ordering
  • CuAu l-type ordered structure
  • Iron-Gold
  • Nano-particles
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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