Morphological change in FePt nanogranular thin films induced by irradiation with 2.4 MeV Cu2+ ions: Electron tomography observation

M. Shirai, T. Horiuchi, A. Horiguchi, S. Matsumura, K. Yasuda, M. Watanabe, T. Masumoto

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Nanogranular thin films, in which FePt nannoparticles are dispersed in an amorphous 20 nm thick Al2O3 layer, were irradiated with 2.4 MeV Cu2+ ions up to 5 × 1019 ions/m2 at room temperature. Electron tomography with a tilt series of bright-field transmission electron microscope images was employed to identify 3-dimensional structural changes due to irradiation. Electron tomography images have clearly revealed that the irradiation with 2.4 MeV Cu2+ ions causes anisotropic deformation of FePt nanoparticles with elongation along the direction of ions trajectory and slight shrinkage in the perpendicular directions. Ion-irradiation results in disordering in FePt, but post-irradiation annealing at 923 K for 1h (3.6 ks) leads to re-ordering without significant coarsening and shape change of FePt particles. It has been demonstrated that electron tomography is a quite useful technique for characterization of shape and dispersion of metallic nanoparticles embedded in an amorphous oxide film.

Original languageEnglish
Pages (from-to)52-58
Number of pages7
JournalMaterials Transactions
Volume47
Issue number1
DOIs
Publication statusPublished - Jan 1 2006

All Science Journal Classification (ASJC) codes

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

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