Cobalt nanoclusters in silica glass: Nonlinear optical and magnetic properties

E. Cattaruzza, F. Gonella, G. Mattei, P. Mazzoldi, D. Gatteschi, C. Sangregorio, M. Falconieri, G. Salvetti, G. Battaglin

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Fused silica plates were implanted with Co ions at room temperature at the energy of 50 keV and to the fluence of 4×1016ionscm-2. The formation of metal nanoclusters was observed by transmission electron microscopy. The cluster size distribution is narrow with a mean-diameter value of about 3 nm. Atomic in-depth distribution was determined by Rutherford backscattering spectrometry, whereas the cobalt chemical state was characterized by electron spectroscopies. Nonlinear refractive index n2is of the order of 0.2cm2GW-1, as determined by the Z-scan technique at a wavelength of 770 nm for 130 fs long pulses at a 76 MHz repetition rate. Zero-field-cooled and field-cooled magnetization curves at the liquid-helium temperature exhibit features of superparamagnetic behavior that are characteristic of assemblies of single-domain nanoparticles. © 1998 American Institute of Physics.
Original languageEnglish
Pages (from-to)1176 - 1178
Number of pages3
JournalApplied Physics Letters
Issue number9
Publication statusPublished - 1998
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Cattaruzza, E., Gonella, F., Mattei, G., Mazzoldi, P., Gatteschi, D., Sangregorio, C., ... Battaglin, G. (1998). Cobalt nanoclusters in silica glass: Nonlinear optical and magnetic properties. Applied Physics Letters, 73(9), 1176 - 1178.