Relation Between Deposition Parameters, Structure and Raman Spectra of Carbon Overcoats on Simulated Magnetic Storage Discs

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Abstract
Raman spectra of carbon overcoats of simulated hard magnetic storage discs were obtained for different conditions of deposition by argon ion-induced sputtering. Both an increase of substrate temperature and of argon ion pressure improved the spectral resolution of the two major Raman peaks, one at 1360 cm-1 (the so-called D peak) and one at 1580 cm-1 (the so-called G peak). By fitting these bands to Lorentzian contours and determining their separation it is possible to develop a quality factor from the spectra, which can be empirically related to performance in a disc drive.