Brillouin light scattering characterization of the surface acoustic wave velocity in sp2 allotropes thin films

Carbon thin films have been deposited by DC magnetron sputtering at different substrate temperatures ranging from 200 K to 400 K. The influence of the preparation substrate temperature on the elastic properties has been evidenced by means of the High Resolution Brillouin Spectroscopy. Thus, the surface acoustic wave (SAW) velocity evolution could be assessed for the different samples. The observed variation is analysed in terms of the relative population of sp2 allotropes phases forming the film. © EDP Sciences, Societa Italiana di Fisica, Springer-Verlag 2010.This work has been supported by the Spanish Ministry of Science and Innovation under contrcat number: MAT2006-01004. One of the authors (E.S.) was supported with a Ph.D. grant of the Spanish Ministry of Science and Innovation under Ref.: BES-2007-16745.Peer Reviewe