Dynamic roughening of tetrahedral amorphous carbon.


The roughness of tetrahedral amorphous carbon (ta-C) films grown at room temperature is measured as a function of film thickness by atomic force microscopy, to extract roughness and growth exponents of alpha approximately 0.39 and beta approximately 0-0.1, respectively. This extremely small growth exponent shows that some form of surface diffusion and relaxation operates at a homologous temperature of 0.07, much lower than in any other material. This is accounted for by a Monte Carlo simulation, which assumes a smoothening during a thermal spike, following energetic ion deposition. The low roughness allows ta-C to be used as an ultrathin protective coating on magnetic disk storage systems with approximately 1 Tbit/in.(2) storage density.

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@article{Casiraghi2003DynamicRO, title={Dynamic roughening of tetrahedral amorphous carbon.}, author={Cinzia Casiraghi and Andrea C. Ferrari and Renate Ohr and Andrew J. Flewitt and David P. Chu and John Robertson}, journal={Physical review letters}, year={2003}, volume={91 22}, pages={226104} }