Lamb waves in unsupported thin films: A Brillouin-scattering study.

Elastic constants and structural properties of nanometre-thick diamond- like carbon films

Carbon coatings of thickness down to 2 nm are needed to increase the storage density in magnetic hard disks and reach the 100-Gbitsyinch target. We show that the combination of surface Brillouin scattering, X-ray reflectivity and Raman spectroscopy 2 measurements allow us to measure the mechanical and structural properties of ultra-thin tetrahedral amorphous carbon films. Densities up to 2.8 gy...

Elastic constants of tetrahedral amorphous carbon films by surface Brillouin scattering

The elastic constants of tetrahedral amorphous carbon ~ta-C! and hydrogenated tetrahedral amorphous carbon ~ta-C:H! thin films were determined nondestructively by surface Brillouin scattering. Besides the usual Rayleigh surface mode, we also observe a new pseudosurface acoustic mode of longitudinal polarization, which is a modified version of the longitudinal guided mode usually found in slow-o...

Mechanical properties of low- and high-k dielectric thin films: A surface Brillouin light scattering study

Brillouin Scattering of Cluster-assembled Carbon Films

The low frequency vibrational spectrum of cluster beam deposited carbon films was studied by Brillouin light scattering. In thin films the values of both bulk modulus and shear modulus has been estimated from the shifts of surface phonon peaks. The values found indicate a mainly sp’ coordinated random network with low density. In thick films a bulk longitudinal phonon peak was detected in a spe...

Effect of deposition temperature on surface acoustic wave velocity of aluminum nitride films determined by Brillouin spectroscopy

Brillouin spectroscopy has been used to study the effect of the deposition temperature on the surface acoustic wave SAW propagation velocity of aluminum nitride AlN films. The results show a dependence of the SAW propagation velocity on the growth temperature of AlN films. The highest value of acoustic velocity was obtained for the film elaborated without heating. Structural characterization of...