Atomic ordering in nano-layered FePt

M. Kozlowski, R. Kozubski, Ch. Goyhenex, V. Pierron-Bohnes, M. Rennhofer, Savko Malinov

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Monte Carlo simulation of chemical ordering kinetics in nano-layered L10 AB binary intermetallics was performed. The study addressed FePt thin layers considered as a material for ultra-high-density magnetic storage media and revealed metastability of the L10 c-variant superstructure with monoatomic planes parallel to the surface and off-plane easy magnetization. The layers, originally perfectly ordered in a c-variant of the L10 superstructure, showed homogeneous disordering running in parallel with a spontaneous re-orientation of the monoatomic planes leading to a mosaic microstructure composed of a- and b-L10-variant domains. The domains nucleated heterogeneously on the surface of the layer and grew discontinuously inwards its volume. Finally, the domains relaxed towards an equilibrium microstructure of the system. Two “atomistic-scale” processes: (i) homogeneous disordering and (ii) nucleation of the a- and b-L10-variant domains showed characteristic time scales. The same was observed for the domain microstructure relaxation. The discontinuous domain growth showed no definite driving force and proceeded due to thermal fluctuations. The above complex structural evolution has recently been observed experimentally in epitaxially deposited thin films of FePt.

Original languageEnglish
Pages (from-to)907-913
Number of pages7
JournalIntermetallics
Volume17
Issue number11
DOIs
Publication statusPublished - Nov 2009

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Fingerprint

Dive into the research topics of 'Atomic ordering in nano-layered FePt'. Together they form a unique fingerprint.

Cite this