Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.diamond.2014.02.011
Title: Bi-level surface modification of hard disk media by carbon using filtered cathodic vacuum arc: Reduced overcoat thickness without reduced corrosion performance
Authors: Yeo, R.J.
Rismani, E.
Dwivedi, N.
Blackwood, D.J. 
Tan, H.R.
Zhang, Z.
Tripathy, S.
Bhatia, C.S. 
Keywords: Carbon overcoat
Corrosion
Head-disk interface
Surface modification
Issue Date: 2014
Citation: Yeo, R.J., Rismani, E., Dwivedi, N., Blackwood, D.J., Tan, H.R., Zhang, Z., Tripathy, S., Bhatia, C.S. (2014). Bi-level surface modification of hard disk media by carbon using filtered cathodic vacuum arc: Reduced overcoat thickness without reduced corrosion performance. Diamond and Related Materials 44 : 100-108. ScholarBank@NUS Repository. https://doi.org/10.1016/j.diamond.2014.02.011
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 350 eV followed by 90 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 1.8 nm dense nano-layered carbon overcoat structure on the surface of the media. Despite an ~ 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 2.7 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. © 2014 Elsevier B.V.
Source Title: Diamond and Related Materials
URI: http://scholarbank.nus.edu.sg/handle/10635/82008
ISSN: 09259635
DOI: 10.1016/j.diamond.2014.02.011
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