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Cobalt ions of 160 keV have been implanted into SiO 2 layers at a fluence of 10 17 atcm -2 at 873 K. The resulting spherical metallic Co nanoparticles have been in their turn irradiated by 200 MeV 127 I ions at between 10 11 and 10 14 ionscm -2 at 300 K. The latter procedure induces an increase of the particle...