The physics of disk lubricant in the continuum picture

Marchon, B.; Dai, Qing; Nayak, V.; Pit, R.

doi:10.1109/tmag.2004.838044

Cited by 36 publications

(16 citation statements)

References 13 publications

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“…Since the vapor pressure of the lubricant is higher in the thick region than in the thin region, this evaporation-condensation process results in a net lubricant transfer from the thick region to the thin region when the slider is flying over and over the surface. Some understandings on the physics behind lubricant transfer (Ma et al 2006;Marchon et al 2003Marchon et al , 2005 also provided quantitative methods to estimate the amount of lubricant transferred from disk to slider or just on the disk surface based on the model that takes into account evaporation/ condensation driven by thin-film vapor pressure, as well as …”

Section: Resultsmentioning

confidence: 99%

Experimental study of slider–lubricant interaction with different slider designs

et al. 2009

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In this study, a new type of femto slider (Panda IV) with improved force arrangement and higher air pressure/higher stiffness at trailing edge of the slider was evaluated and compared experimentally with our previous type of femto sliders (Panda II and III). The evaluations were conducted on the Candela 5100 Optical Surface Analyzer (OSA) with the VENA CSS/load-unload system attached. Disks coated with a layer of 1.2 nm lubricant were specially prepared with a lubricant step for the comparison tests. Flying height (FH) of each slider was calibrated by bump disk with 3.5 nm bump height for maintaining the consistent FH during the tests. The relative amount of lubricant redistribution was analyzed with an OSA immediately after each slider is flown on-track for a period of time. It is found that the amount of lubricant transferred or the slider-lubricant interaction are minimized by reducing the size of slider's central trailing pad. Finally, possible explanations on the lubricant transfer are discussed.

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Section: Resultsmentioning

confidence: 99%

Experimental study of slider–lubricant interaction with different slider designs

et al. 2009

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“…Various effects, such as thermally excited capillary waves [15] and 'lubricant moguls' [16,17], as well as the lubricant thickness itself [18] contribute to the experimentally measured roughness and need to be accounted for within the context of lubricant contact. The ISBL model [3,4] addresses some of these issues by utilizing experimental measurements of roughness under both static and dynamic conditions.…”

Section: Molecularly Thin Lubricant On Rough Substratesmentioning

confidence: 99%

Modeling Sliding Contact of Rough Surfaces with Molecularly Thin Lubricants

Vakis

Polycarpou

2011

Tribol Lett

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The sliding contact between two rough surfaces in the presence of a molecularly thin lubricant layer is investigated. Under very high shear rates, the lubricant is treated as a semi-solid layer with normal and lateral sheardependent stiffness components obtained from experimental data. The adhesive force in the presence of lubricant is also adapted from the Sub-boundary lubrication model and improved to account for variation in surface energy with penetration into the lubricant layer. A model is then proposed, based on the Improved sub-boundary lubrication model, which accounts for lubricant contact and adhesion and its validity is discussed. The model is in good agreement with published experimental measurements of friction in the presence of molecularly thin lubricant layers and suggests that a molecularly thin lubricant bearing could be successfully used to reduce solid substrate damage at the interface.

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“…1, the magnetic disk, which is used to store the data, is actually covered by a thin layer of lubricant, which serves to reduce the possibility of the slider's contact onto the disk. The shear force on the lubricant has been shown to be the dominant factor determining the deformation and instability of the lubricant layer [3,4]. This deformation and instability serve as a mechanism for the transfer of the lubricant from the disk to the slider [5], which increases the likelihood of the slider's impact on the disk and can result in wear of the disk as well as the loss of data stored on the disk.…”

Section: Introductionmentioning

confidence: 99%

Temperature Effect on a HDD Slider’s Flying Performance at Steady State

Liu

Bogy

2009

Tribol Lett

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The temperature inside modern hard disk drives (HDDs) can become as high as 100°C during operation. The effects of such high temperatures on the slider's flying attitude and the shear forces on the slider and the disk are investigated in this paper. General formulae for the shear forces are derived, and the generalized Reynolds equation is modified to take into account the temperature effect on the mean free path of air as well as the air viscosity. Numerical results are obtained for two different air bearing surface designs. It is shown that the temperature changes result in non-negligible changes in the slider's flying height and the shear forces. These changes could further induce changes in the deformation and instability of the lubricant layer and thereby affect the reliability of the HDDs.

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The physics of disk lubricant in the continuum picture

Cited by 36 publications

References 13 publications

Experimental study of slider–lubricant interaction with different slider designs

Experimental study of slider–lubricant interaction with different slider designs

Modeling Sliding Contact of Rough Surfaces with Molecularly Thin Lubricants

Temperature Effect on a HDD Slider’s Flying Performance at Steady State

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