Long-Range Order Parameter of Oriented L10-FePt Nanoparticles Determined by Electron Diffraction

Kazuhisa Sato, Yoshihiko Hirotsu

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)

    Abstract

    Two-dimensionally dispersed L0-FePt nanoparticles as small as 12 nm with orientation was fabricated by electron-beam evaporation and post-annealing at 873 K. After a prolonged annealing at 873 K for 86.4 ks, the increase of coercivity was almost saturated and coercivity reached 434 kAm -1 at 300 K, which is very small compared to recent reports on FePt nanoparticles with sizes larger than 20 nm. Long-range order parameter of the fabricated nanoparticles was determined by electron diffraction at 200 kV taking the multiple scattering into consideration. Obtained order parameter remained 0.55 ± 0.02 for the nanoparticles with an axial ratio c/a of 0.961 ± 0.003. The low degree of order is thought to be responsible for the small coercivity. Effect of Debye-Waller factor on the order parameter was discussed.

    Original languageEnglish
    Pages (from-to)1518-1522
    Number of pages5
    JournalMaterials Transactions
    Volume44
    Issue number8
    DOIs
    Publication statusPublished - 2003 Aug

    Keywords

    • Dynamical scattering
    • Electron diffraction
    • FePt
    • Hh0 systematic reflection
    • Multi-slice simulation
    • Nanoparticle
    • Order parameter

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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