Morphological change in FePt nanogranular thin films induced by swift heavy ion irradiation

M. Shirai, K. Tsumori, M. Kutsuwada, K. Yasuda, S. Matsumura

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We have investigated morphology change of FePt nanogranular films (FePt)47(Al2O3)53 under irradiation with 210 MeV Xe ions. Here, electron tomography technique was extensively employed to clarify three-dimensional (3D) structure in irradiated specimens, in addition to conventional transmission electron microscopy (TEM) techniques such as bright-field observation and scanning TEM energy dispersive X-ray spectroscopy (STEM-EDX) analysis. The ion irradiation induces the coarsening of FePt nanoparticles with elongation along the beam direction. Electron tomography 3D reconstructed images clearly demonstrated that when the fluence achieves 5.0 × 1014 ions/cm2, well-coarsened FePt balls have been formed on the irradiated surface, and the particles in the film interior have been deformed into rods along the ion trajectory. The alloy particles become inhomogeneous in composition after prolonged irradiation up to 1.0 × 1015 Xe ions/cm2. The particle center is enriched with Pt, while Fe is slightly redistributed to the periphery.

Original languageEnglish
Pages (from-to)1787-1791
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue number10
Publication statusPublished - May 15 2009

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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