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, HH 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 sp 3 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 sp 2 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 sp 3 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
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:21
Last Modified: 21 Sep 2017 01:38
DOI: