Thin carbon film overcoats were deposited on rigid disks of magnetic thin film media by RFD diode sputtering using a mixture of argon and nitrogen gas. Constant drag test (CDT) and initial take-off velocity of thin film head sliders were measured using a computer-controlled friction-wear tester. As the nitrogen partial pressure was increased from 0 mTorr to 7.5 mTorr, the number of revolutions before wear failure increased from 3000 to 9000 revolutions and the initial take-off velocity decreased from 3.82 m/s to 2.58 m/s. The chemical bonding and elemental composition as determined by X-ray photoelectron spectroscopy and the microstructure as observed by transmission electron microscopy were used to correlate the durability and structure of RF sputtered carbon-nitrogen thin films.>
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Yeh et al. (1991) studied this question.