Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7111492 | Diamond and Related Materials | 2014 | 9 Pages |
Abstract
The corrosion performance of commercial hard disk media which was subjected to bi-level surface modification has been reported. The surface treatment was carried out by bombarding the surface of the magnetic media with C+ ions at 350Â eV followed by 90Â eV using filtered cathodic vacuum arc (FCVA). The energy and embedment depth of the impinging C+ ions were adjusted by applying an optimized bias to the substrate and simulated by a Stopping and Range of Ions in Matter (SRIM) code which predicted the formation of a graded atomically mixed layer at the carbon-media interface. Cross-section transmission electron microscopy (TEM) revealed the formation of a 1.8Â nm dense nano-layered carbon overcoat structure on the surface of the media. Despite an ~Â 33% reduction in the thickness, the bi-level surface modified disk showed corrosion performance similar to that of a commercially manufactured disk with a thicker carbon overcoat of 2.7Â nm. This improvement in the corrosion/oxidation resistance per unit thickness can be attributed to the formation of a dense and highly sp3 bonded carbon layer, as revealed by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. This study demonstrates the effectiveness of the bi-level surface modification technique in forming an ultra-thin yet protective overcoat for future hard disks with high areal densities.
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Authors
Reuben J. Yeo, Ehsan Rismani, Neeraj Dwivedi, Daniel J. Blackwood, H.R. Tan, Z. Zhang, S. Tripathy, C.S. Bhatia,