Surface and lubricant/overcoat interface properties of the rigid disks after corrosion

Huang, L. J.; Hung, Yu-Chueh; Chang, S.

doi:10.1109/20.617875

Cited by 24 publications

(8 citation statements)

References 4 publications

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“…This also has an adversary effect through Ar trapping in the film. 15 Therefore, a less porous and more homogeneous coating resulted at Ϫ120 V. 11,12 On the positive side, application of a substrate bias encourages adatom mobility.…”

Section: Resultsmentioning

confidence: 99%

Influence of Carbon Sputtering Conditions on Corrosion Protection of Magnetic Layer by an Electrochemical Technique

Balakrisnan¹,

Tomčik

Blackwood³

2002

J. Electrochem. Soc.

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For high density magnetic recording, it is necessary to protect the magnetic layer from wear and corrosion with a thin carbon overcoat. On ultrasmooth disk substrates, magnetron sputtering is still the preferred technique because it can provide protective carbon layers as thin as 4 nm. Degradation of the magnetic layer occurs in the atmosphere and during hard disk operation; thus, the carbon-based overcoat functions as an indispensable component in protecting the essential magnetic layer. Moreover, carbon overcoat quality plays a vital role in the strong demand to reduce the flying height between a disk and read/write head, which in turn enhances the density of recording. The impact of sputtering conditions on the quality of deposited amorphous hydrogenated and nitrogenated carbon was assessed by the electrochemical measurement of the linear polarization resistance. The film's polarization resistance was correlated to its porosity, and a statistical method was developed to allow easy comparison of results in the data analysis. The results obtained suggest that the best overcoats are formed with a substrate voltage bias of Ϫ120 V, a very low deposition pressure of 0.9 mTorr, a dc magnetron sputtering power of 2.8 W/cm 2 , and with incorporation of ethylene gas in the Ar ϩ N 2 gas mixture. The filling of film voids increased with ion flux and decreased with increasing deposition rate.

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Section: Resultsmentioning

confidence: 99%

Influence of Carbon Sputtering Conditions on Corrosion Protection of Magnetic Layer by an Electrochemical Technique

Balakrisnan¹,

Tomčik

Blackwood³

2002

J. Electrochem. Soc.

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“…ESCA is widely used for measuring the cobalt oxide concentration due to its quantitative capability suitable to 0022-3727/09/225308+06$30.00 be used at where the production of magnetic media [8] takes place. However, its relative high detection threshold limit at the estimated 10% Co x O y with respect to the metallic cobalt (Co) severely restricts its application in the highly demanded sensitivity level for current media corrosion evaluation.…”

Section: Introductionmentioning

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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“…The use of perfluorinated polyethers (PFPEs) as lubricants for magnetic recording media has prompted considerable research on their surface chemical and wetting properties on a variety of substrates, including amorphous carbon and SiO 2 , − as well as various metals. , The significant improvements that PFPEs have enabled in magnetic recording media, in turn, have sparked an interest in developing new uses for PFPE materials as agents for modifying surfaces. Recently, this class of compounds has attracted attention for its wear resistance and water barrier properties, and for potential applications of PFPEs as ultrathin barrier layers to diffusion and corrosion on solid surfaces. − For example, derivatives of commercial PFPE lubricants have been shown to chemisorb on SiO 2 and amorphous carbon substrate surfaces, opening up the possibility of using amphiphilic PFPE derivatives as stable ultrathin Teflon-like polymeric coatings for surfaces. ,− Nanoscale thin films of these materials have been formed on SiO 2 using commercially available PFPEs, including those available under the trade names Krytox (DuPont), Fomblin (Montedison), and Demnum (Daikin), and their derivatives. ,− …”

Section: Introductionmentioning

confidence: 99%

“…Recently, this class of compounds has attracted attention for its wear resistance and water barrier properties, and for potential applications of PFPEs as ultrathin barrier layers to diffusion and corrosion on solid surfaces. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] For example, derivatives of commercial PFPE lubricants have been shown to chemisorb on SiO 2 and amorphous carbon substrate surfaces, opening up the possibility of using amphiphilic PFPE derivatives as stable ultrathin Teflonlike polymeric coatings for surfaces. 6,[29][30][31][32][33][34][35] Nanoscale thin films of these materials have been formed on SiO 2 using commercially available PFPEs, including those available under the trade names Krytox (DuPont), Fomblin (Montedison), and Demnum (Daikin), and their derivatives.…”

Section: Introductionmentioning

confidence: 99%

Driven Pattern Formation in Organic Thin Film Materials: Complex Mesoscopic Organization in Microcontact Printing on Si/SiO₂ via the Spontaneous Dewetting of a Functionalized Perfluoropolyether Ink

Erhardt

Nuzzo

2001

J. Phys. Chem. B

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Polyfluoropolyether (PFPE) films have long been used as lubricant coatings for magnetic recording media. In this paper, we demonstrate that the unique wetting properties of PFPEsmore specifically, the dynamical organizations that result from spontaneous dewettingcan be harnessed to generate mesoscopically patterned features of these materials on SiO2. In this work, a functionalized PFPE amphiphile with the formula CF3CF2CF2O(CF(CF3)CF2O) n CF(CF3)CONHCH2CH2CH2Si(OCH3)3 (Krytox SA, DuPont) was deposited on a SiO2 surface by both spin-casting and contact printing. Both methods produce complex surface structures comprised of beaded domains and depletion regions (and in the case of spin-casting, also thin films) that result from dewetting processes. Spontaneous dewetting was used to generate self-organizing PFPE bead patterns by microcontact printing. The wetting transitions in this latter case occur directly on the printing tool and, via the bias provide by the topography of the stamp, provide a means for generating and transferring complex organizations of adsorbate domains to the substrate. The combination of contact printing with spontaneous dewetting of the PFPE enabled us to produce high-fidelity patterns of discrete, micron-scale beads from printing tools with continuous line shapes without any alteration to the original mask pattern. The patterned beads typically had radii and characteristic separation lengths on the micron-scale, and heights on the nanoscale. These length scales appear to be governed by the combined influences of solvent-mediated nucleation processes and coarsening. Characterization was performed by optical microscopy, atomic force microscopy (AFM), secondary ion mass spectrometry (SIMS), and X-ray photoelectron spectroscopy (XPS). These data suggest general design strategies that can be exploited to control the contours and structural profiles that result from the dewetting of the PFPE ink on a stamp used for contact printing.

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Surface and lubricant/overcoat interface properties of the rigid disks after corrosion

Cited by 24 publications

References 4 publications

Influence of Carbon Sputtering Conditions on Corrosion Protection of Magnetic Layer by an Electrochemical Technique

Influence of Carbon Sputtering Conditions on Corrosion Protection of Magnetic Layer by an Electrochemical Technique

An ultra-sensitive method for quantifying magnetic media corrosion

Driven Pattern Formation in Organic Thin Film Materials: Complex Mesoscopic Organization in Microcontact Printing on Si/SiO₂ via the Spontaneous Dewetting of a Functionalized Perfluoropolyether Ink

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Surface and lubricant/overcoat interface properties of the rigid disks after corrosion

Cited by 24 publications

References 4 publications

Influence of Carbon Sputtering Conditions on Corrosion Protection of Magnetic Layer by an Electrochemical Technique

Influence of Carbon Sputtering Conditions on Corrosion Protection of Magnetic Layer by an Electrochemical Technique

An ultra-sensitive method for quantifying magnetic media corrosion

Driven Pattern Formation in Organic Thin Film Materials: Complex Mesoscopic Organization in Microcontact Printing on Si/SiO2 via the Spontaneous Dewetting of a Functionalized Perfluoropolyether Ink

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Product

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Driven Pattern Formation in Organic Thin Film Materials: Complex Mesoscopic Organization in Microcontact Printing on Si/SiO₂ via the Spontaneous Dewetting of a Functionalized Perfluoropolyether Ink