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Wear
Paper

Raman spectroscopy of disk coatings in a working magnetic disk drive

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Abstract

Raman spectroscopy is a very sensitive indicator of the structure and history of hard carbon films which have been recently used as wear-resistant coatings in thin film magnetic disk drives. In this first application of Raman spectroscopy to a working disk drive we obtain a sensitivity of 0.5 nm in the thickness of a carbon layer with respect to spatial variations. To within this sensitivity, no wear is detected in the slider track after 43000 start-stop cycles. The effect of laser heating is observed on the carbon overlayer while monitoring the disk temperature through the Raman spectrum. © 1987.

Date

15 May 1987

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Wear

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