Diamond-like carbon overcoat for magnetic thin film recording disks

Teng, E.; Jiaa, Chi L.; Eltoukhy, A.

doi:10.1016/0257-8972(94)90229-1

Cited by 21 publications

(5 citation statements)

References 9 publications

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“…Conventional storage devices today guard against “crashes” through the application of a protective overcoat in the form of a hydrogenated or nitrogenated amorphous carbon (a-CH x and a-CN x , respectively) film onto the magnetic storage layer in a thickness of ∼100 Å. , The chemical bonding of the carbon in these films, which plays a primary role in determining its properties and its interactions with the lubricant, can vary from predominately sp 2 to sp 3 depending on deposition conditions and hydrogen or nitrogen content. These films also have the desirable properties of high wear resistance, low friction characteristics, and chemical inertness. − …”

Section: Introductionmentioning

confidence: 99%

“…These films also have the desirable properties of high wear resistance, low friction characteristics, and chemical inertness. [3][4][5] In addition to the carbon film, a topical perfluoropolyalkyl ether (PFPE) lubricant film having a thickness of 10-20 Å is applied to further protect the surface of the magnetic storage medium. 2,6,7 The PFPE molecules are linear polymers with average molecular weights of 2000-4000 amu 8 and are selected for their low volatility and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

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Bonding of Ethers and Alcohols to a-CN_x Films

Paserba¹,

Shukla²,

Gellman³

et al. 1999

Langmuir

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The surface chemistry of fluorinated ethers and fluorinated alcohols adsorbed on amorphous nitrogenated carbon (a-CN x ) have been studied as models for the interaction of perfluoropolyalkyl ether (PFPE) lubricants with the surfaces of magnetic data storage media. Temperature-programmed desorption experiments conducted in ultrahigh vacuum using small fluorinated ethers and fluorinated alcohols have measured their desorption energies and have provided insight into the nature of bonding between PFPEs and a-CN x films. Preliminary results indicate that ether linkages interact with a-CN x films through electron donation from the oxygen lone pair electrons. In contrast, alcohol end groups show evidence of hydrogen bonding with a-CN x films. The models derived from this study can aid in the future development of both lubricants and protective overcoats to ensure that the magnetic hard disks display optimal wear resistance and performance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bonding of Ethers and Alcohols to a-CN_x Films

Paserba¹,

Shukla²,

Gellman³

et al. 1999

Langmuir

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“…Teng et al have demonstrated that the low I D /I G value with high sp 3 content will increase the average surface roughness, which caused the DLC films enhancing the surface hydrophobicity. 24) 3.2 Surface and cross-section morphologies SEM images for the 500-nm-period single-layer hexagonal PS nanosphere arrays and the as-prepared samples under different oxygen plasma RIE conditions are shown in Fig. 3.…”

Section: Properties Of Dlc Filmsmentioning

confidence: 99%

Hydrophobic and high transparent honeycomb diamond-like carbon thin film fabricated by facile self-assembled nanosphere lithography

Peng

Wei

Lin

et al. 2014

Jpn. J. Appl. Phys.

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In this paper, we take advantage of a facile fabrication technique called self-assembled nanosphere lithography (SANSL) combining with proper two-step reactive ion etching (RIE) method and radio frequency (RF) sputtering deposition process for manufacturing honeycomb diamond-like carbon (DLC) thin film structures with hydrophobic and high transparent properties. It is found that the DLC thin films deposited on clean glass substrates at the RF power of 100 W with the surface roughness (R a) of 2.08 nm and the I D/I G ratio of 1.96 are realized. With a fill-factor of 0.691, the honeycomb DLC patterned thin film shows the best transmittance performance of 87% in the wavelength of visible light, and the optimized contact angle measurement is ∼108°. Compared with the pure DLC thin film and original glass substrate, the hydrophobic property of the patterned DLC films is significantly improved by 80 and 160%, respectively.

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“…Because of these excellent tribological properties, DLC films are used as protective coatings on microelectronic devices, optical devices, and magnetic storage media [2]. In general, the performance of thin DLC films is highly dependent on their microstructures and chemical compositions, and thus depends on their fabrication process [3,4]. Surface morphology is another important factor that can greatly affect tribological properties of DLC films.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Trapped Charges-Induced Stain Formation on RF-PECVD Diamond-Like Carbon Films

Seekumbor

Jaroenapibal

Lertwikool

et al. 2012

SSP

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This paper reports the investigation of a root cause of stain formation on the surfaces of diamond-like carbon (DLC) films. The DLC thin films are prepared using a radio-frequency plasma enhance chemical vapor deposition (RF-PECVD) technique with C2H4 as a carbon precursor gas. We have observed water spot-like stains on the DLC surfaces after treating the films with a dilute solution of dipropylene glycol monomethyl ether (DPGME). Low voltage-scanning electron microscopy (SEM) is employed to examine the thin layer of agglomerated stains on the surfaces. The results from capacitance-voltage (C-V) measurements show that as-deposited films inherit some trapped charge accumulations within the structure, thereby resulting in the pronounced shift in the flat-band voltage. These trapped charges make the films prone to surface stain formation. Post-annealing of the DLC films at 200 °C in N2 for 1 h has proven to reduce the trapped charge density, and therefore prevent stain formation on the DLC films.

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Diamond-like carbon overcoat for magnetic thin film recording disks

Cited by 21 publications

References 9 publications

Bonding of Ethers and Alcohols to a-CN_x Films

Bonding of Ethers and Alcohols to a-CN_x Films

Hydrophobic and high transparent honeycomb diamond-like carbon thin film fabricated by facile self-assembled nanosphere lithography

Investigation of Trapped Charges-Induced Stain Formation on RF-PECVD Diamond-Like Carbon Films

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Diamond-like carbon overcoat for magnetic thin film recording disks

Cited by 21 publications

References 9 publications

Bonding of Ethers and Alcohols to a-CNx Films

Bonding of Ethers and Alcohols to a-CNx Films

Hydrophobic and high transparent honeycomb diamond-like carbon thin film fabricated by facile self-assembled nanosphere lithography

Investigation of Trapped Charges-Induced Stain Formation on RF-PECVD Diamond-Like Carbon Films

Contact Info

Product

Resources

About

Bonding of Ethers and Alcohols to a-CN_x Films

Bonding of Ethers and Alcohols to a-CN_x Films