TY - JOUR
T1 - Morphological change in FePt nanogranular thin films induced by irradiation with 2.4 MeV Cu2+ ions
T2 - Electron tomography observation
AU - Shirai, M.
AU - Horiuchi, T.
AU - Horiguchi, A.
AU - Matsumura, S.
AU - Yasuda, K.
AU - Watanabe, M.
AU - Masumoto, T.
PY - 2006/1
Y1 - 2006/1
N2 - 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.
AB - 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.
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U2 - 10.2320/matertrans.47.52
DO - 10.2320/matertrans.47.52
M3 - Article
AN - SCOPUS:33644803168
SN - 1345-9678
VL - 47
SP - 52
EP - 58
JO - Materials Transactions
JF - Materials Transactions
IS - 1
ER -