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Nanoparticles of metallic Cobalt and Nickel prepared by ion implantation into SiO2

  • O. Cíntora-González (a1) (a2), C. Estournès (a1), D. Muller (a2), M. Richard-Plouet (a1), A. Traverse (a3), J. L. Guille (a1) and J.J. Grob (a2)...

Abstract

The structural and magnetic properties of nano-sized particles of transition metals (Co and Ni) implanted into amorphous SiO2 are investigated. The SiO2 substrates used were as grown on a silicon (100) wafer under wet O2 atmosphere. The metals were implanted as singly charged atoms energized to 30 or 160 keV. Transmission Electron microscopy (TEM) observations and X-ray absorption spectroscopy (XAS) show that M+ implantation results in the formation of metallic nanoparticles at the vicinity of the surface whereas oxide particles (< 1 nm) are formed in a deeper region. After thermal treatment under hydrogen, TEM evidences the disappearance of the oxide region and an increase in the size of the metallic particle. XAS shows that cobalt and nickel are entirely in the metallic form and saturation magnetization becomes close to the theoretical value.

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Nanoparticles of metallic Cobalt and Nickel prepared by ion implantation into SiO2

  • O. Cíntora-González (a1) (a2), C. Estournès (a1), D. Muller (a2), M. Richard-Plouet (a1), A. Traverse (a3), J. L. Guille (a1) and J.J. Grob (a2)...

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