MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Morphological Change in FePt Nanogranular Thin Films Induced by Irradiation with 2.4 MeV Cu2+ Ions: Electron Tomography Observation
M. ShiraiT. HoriuchiA. HoriguchiS. MatsumuraK. YasudaM. WatanabeT. Masumoto
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2006 Volume 47 Issue 1 Pages 52-58

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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 1 h (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.

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© 2006 The Japan Institute of Metals and Materials
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