Emulating media defect corrosion

Dai, Qing; Pradia-Silva, G.; Yen, B. Linju; Marchon, B.; Rettner, Charles

doi:10.1109/tmag.2005.855258

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…The DLC overcoat material currently applied in the magnetic recording disc industry is one or two thin films of DLC protecting the magnetic layers chemically and mechanically. 4,5 To meet the demands of ever increasing areal density of magnetic recording, reducing the DLC film thickness, which in turn decreases the head disc spacing, must be achieved without sacrificing its film integrity and corrosion protection capabilities. Therefore, one needs good properties of electrical resistivity and chemical inertness in this application.…”

Section: Introductionmentioning

confidence: 99%

“…These DLC properties are attractive for hard disc drive devices, including magnetic recording disc requirements for over 10 years. The DLC overcoat material currently applied in the magnetic recording disc industry is one or two thin films of DLC protecting the magnetic layers chemically and mechanically 4,5. To meet the demands of ever increasing areal density of magnetic recording, reducing the DLC film thickness, which in turn decreases the head disc spacing, must be achieved without sacrificing its film integrity and corrosion protection capabilities.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation and microcorrosion of DLC ultrathin films with acetylene and ethylene source gases by PECVD

Chen

Tan

2011

Surface Engineering

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Diamond like carbon (DLC) films were deposited by plasma enhanced chemical vapour deposition, whose purpose is in the application of the films to further improve read/write durability of next generation recording discs. The effects of acetylene (C 2 H 2 ) and ethylene (C 2 H 4 ) source gases and deposition parameters on roughness, structure, hardness, resistivity, silicone contamination, glide performance and microcorrosion measurement on the cobalt concentration of DLC films are studied utilising the following equipment: AFM, Raman, nanoindenter, resistivity gauge meter, phase metrics, time of flight SIMS and inductively coupled plasma mass spectroscopy. Results show that the Raman I d /I g ratio, G and D peak wavenumber, hardness, glide noise and avalanche, silicone contamination and cobalt concentration of the C 2 H 4 source gas films are significantly lower than those of C 2 H 2 gas. Diamond like carbon films prepared at the higher gas flow exhibit a lower I d /I g and cobalt concentration. Films deposited with a higher voltage bias and heater power will induce a higher I d /I g and cobalt concentration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterisation and microcorrosion of DLC ultrathin films with acetylene and ethylene source gases by PECVD

Chen

Tan

2011

Surface Engineering

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“…Cobalt hydroxide then migrates to the surface of the carbon overcoat, either driven galvanically or by the oxygen concentration gradients. Subsequently, it dehydrates and forms needle-like cobalt oxide on the surface of the carbon overcoat under ambient environment that is at a lower humidity level [10,11].…”

Section: Mechanism Of Cobalt Oxide Migration Onto the Disk Surfacementioning

confidence: 99%

An ultra-sensitive method for quantifying magnetic media corrosion

Zhu¹,

Li²,

Yao³

2009

J. Phys. D: Appl. Phys.

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We propose a new method for quantifying cobalt oxide on the magnetic recording media using the time-of-flight secondary ion mass spectrometry (TOF-SIMS) technique. Quantification of cobalt oxide using TOF-SIMS can be achieved by the selection of a specific ratio of the mass species Co(OH) to Cr, which is found to represent the characteristics of the corrosive cobalt oxide on the media surface. By setting an appropriate threshold of this ratio at 0.1, the new method correlates very well (correlation coefficient, R2 > 90%) with the method using electron spectroscopy for chemical analysis (ESCA), a widely employed surface quantitative tool used to detect magnetic media corrosion. Compared with the ESCA detection limit (at 10% CoxOy), it is found that the sensitivity of the new method in detecting the cobalt oxide is much higher with an ability to detect disk media corrosion as low as a ratio of 0.02. This is in stark contrast to the ESCA method which can only detect a change in the disk media corrosion at a much higher limiting threshold at a ratio of 0.1.

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