CUED Publications database

Resonant Raman characterisation of ultra-thin nano-protective carbon layers for magnetic storage devices

Gradowski, MV and Ferrari, AC and Ohr, R and Jacoby, B and Hilgers, H and Schneider, H-H and Adrian, H (2003) Resonant Raman characterisation of ultra-thin nano-protective carbon layers for magnetic storage devices. Surface and Coatings Technology, 174-17. pp. 246-252. ISSN 0257-8972

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Abstract

Carbon thin films are very important as protective coatings for a wide range of applications such as magnetic storage devices. The key parameter of interest is the sp3 fraction, since it controls the mechanical properties of the film. Visible Raman spectroscopy is a very popular technique to determine the carbon bonding. However, the visible Raman spectra mainly depend on the configuration and clustering of the sp2 sites. This can result in the Raman spectra of different samples looking similar albeit having a different structure. Thus, visible Raman alone cannot be used to derive the sp3 content. Here we monitor the carbon bonding by using a combined study of Raman spectra taken at two wavelengths (514 and 244 nm). We show how the G peak dispersion is a very useful parameter to investigate the carbon samples and we endorse it as a production-line characterisation tool. The dispersion is proportional to the degree of disorder, thus making it possible to distinguish between graphitic and diamond-like carbon. © 2003 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Carbon thin films Protective coatings Raman spectroscopy
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:21
Last Modified: 08 Dec 2014 02:24
DOI: 10.1016/S0257-8972(03)00602-9