Characterization of Head Overcoat for 1 Tb/in$^{2}$ Magnetic Recording

Yasui, Nobuto; Inaba, Hiroshi; Furusawa, K.; Saito, Masato; Ohtake, Naoto

doi:10.1109/tmag.2008.2010636

Cited by 30 publications

(15 citation statements)

References 13 publications

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“…An extremely thin layer of DLC protective film, typically thinner than 2 nm, is usually applied to the magnetic layer. However, it is difficult to maintain mechanical durability as the thickness of the deposited DLC film is decreased [ 6 , 7 ]. Thus, the durability of extremely thin (about 1 nm thick) DLC film, subjected to friction and wear, should be evaluated.…”

Section: Introductionmentioning

confidence: 99%

Friction Durability of Extremely Thin Diamond-Like Carbon Films at High Temperature

2017

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Abstract:To clarify the friction durability, both during and after the high-temperature heating of nanometer-thick diamond-like carbon (DLC) films, deposited using filtered cathodic vacuum arc (FCVA) and plasma chemical vapor deposition (P-CVD) methods, the dependence of the friction coefficient on the load and sliding cycles of the DLC films, were evaluated. Cluster-I consisted of a low friction area in which the DLC film was effective, while cluster-II consisted of a high friction area in which the lubricating effect of the DLC film was lost. The friction durability of the films was evaluated by statistical cluster analysis. Extremely thin FCVA-DLC films exhibited an excellent wear resistance at room temperature, but their friction durability was decreased at high temperatures. In contrast, the durability of the P-CVD-DLC films was increased at high temperatures when compared with that observed at room temperature. This inverse dependence on temperature corresponded to the nano-friction results obtained by atomic force microscopy. The decrease in the friction durability of the FCVA-DLC films at high temperatures, was caused by a complex effect of temperature and friction. The tribochemical reaction produced by the P-CVD-DLC films reduced their friction coefficient, increasing their durability at high temperatures.

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Section: Introductionmentioning

confidence: 99%

Friction Durability of Extremely Thin Diamond-Like Carbon Films at High Temperature

2017

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“…They are well known for their superior physical and chemical properties [1][2][3]. To date, DLC with the highest fraction of sp 3 bonding has been deposited form a filtered cathodic arc (FCA) or mass selected beam of C + ions for a solid carbon source [2].…”

Section: Introductionmentioning

confidence: 99%

“…To date, DLC with the highest fraction of sp 3 bonding has been deposited form a filtered cathodic arc (FCA) or mass selected beam of C + ions for a solid carbon source [2]. To achieve a high areal density system, DLC overcoats on magnetic recording head have to meet the criteria of corrosion and wear resistance at the thickness less than 2 nm [3]. Unfortunately, previous studies have shown that DLC films cannot retain their superior characteristics at higher temperature because of the irreversible change in the structure, which limits the application of these films [4].…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability Evaluation of Diamond-like Carbon for Magnetic Recording Head Application using Raman Spectroscopy

Khamnualthong

Siangchaew²,

Limsuwan

2012

Procedia Engineering

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Diamond-like carbon (DLC) films were deposited on magnetic recording heads using filter cathodic arc for improvement of tribological property and corrosion protection. To increase the areal density of magnetic storage, the thickness of DLC film has to be decreased to less than few nanometers. In addition, the heat occurred at the head-disk interface during the operation can impact on the properties and protective performance of DLC films. In this work, the effect of heat on the properties of DLC films was investigated by visible Raman spectroscopy. The Raman spectra of DLC film as a function of heating temperature and time were carried out. The Raman spectra revealed that the degree of graphitization of the DLC films increased with increasing of temperature and time. The relative Raman intensity was found to decrease with possibility of sp 3 /sp 2 ratio decreasing in the films. It can be concluded that the thermal stability of DLC film degraded at high temperature environment.

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“…16,17 Usually, in a scratch test, a microscale diamond tip or indenter is moving over a sample under a normal load, which is increased either continuously or stepwise until a specifically defined failure is observed, at which point the corresponding load, called the critical load, is obtained. 16,17 Usually, in a scratch test, a microscale diamond tip or indenter is moving over a sample under a normal load, which is increased either continuously or stepwise until a specifically defined failure is observed, at which point the corresponding load, called the critical load, is obtained.…”

Section: Introductionmentioning

confidence: 99%

Scratch properties of nickel thin films using atomic force microscopy

Tseng

Shirakashi

Jou

et al. 2010

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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In vivo nanomechanical imaging of blood-vessel tissues directly in living mammals using atomic force microscopy Appl. Phys. Lett. 95, 013704 (2009); Experiments using atomic force microscopy ͑AFM͒ as a machining tool for scratching patterns on nickel thin films have been conducted with an emphasis on establishing the material scratchability or more general, the nanoscale machinability. The effects of the scratch parameters, including the applied tip force and scratch direction, on the size of the scratched geometry were investigated. The primary factors that measure the scratchability were then assessed. The scratchability of Ni as compared to that of Si was specifically evaluated and discussed. A stress-hardness analysis was also performed to further validate the experimental and correlation results. All results indicate that the Ni thin film possesses excellent scratchability and one order of magnitude higher than that of Si. Based on the correlation formula developed, Ni should be able to be precisely scratched by AFM tip with the required dimension and nanoscale accuracy and precision.

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Characterization of Head Overcoat for 1 Tb/in$^{2}$ Magnetic Recording

Cited by 30 publications

References 13 publications

Friction Durability of Extremely Thin Diamond-Like Carbon Films at High Temperature

Friction Durability of Extremely Thin Diamond-Like Carbon Films at High Temperature

Thermal Stability Evaluation of Diamond-like Carbon for Magnetic Recording Head Application using Raman Spectroscopy

Scratch properties of nickel thin films using atomic force microscopy

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