A model for lubricant flow from disk to slider

Marchon, B.; Karis, T.; Dai, Qing; Pit, R.

doi:10.1109/tmag.2003.816433

Cited by 70 publications

(41 citation statements)

References 15 publications

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“…The reference bulk vapor pressure p 0 is a function of the lubricant molecular weight M w . An empirical relationship for Z-type PFPE has been used in disk drives (Marchon et al 2003):…”

Section: Heat Transfer and Lubricant Depletion Modelmentioning

confidence: 99%

Modeling laser induced lubricant depletion in heat-assisted-magnetic recording systems using a multiple-layered disk structure

Talke

2011

Microsyst Technol

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In this paper, we model the depletion of lubricant from a disk surface subject to heating by a scanning laser in a heat assisted magnetic recording (HAMR) system. A multi-layer disk structure is used consisting of the substrate (either glass or aluminum), the CoFe based soft magnetic under-layer, a Ru based intermediate layer, a CoCrPt based recording layer, the diamond-like-carbon layer, and the lubricant film. The thickness and material properties of the different layers are shown to play an important role in the conduction of heat from the top layer to the bottom layer and, consequently, in the lubricant depletion process due to heating by a scanning laser. The results show that it is critical to include realistic multi-layer disk structures in HAMR lubricant depletion modeling.

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“…The reference bulk vapor pressure p 0 is a function of the lubricant molecular weight M w . An empirical relationship for Z-type PFPE has been used in disk drives (Marchon et al 2003):…”

Section: Heat Transfer and Lubricant Depletion Modelmentioning

confidence: 99%

Modeling laser induced lubricant depletion in heat-assisted-magnetic recording systems using a multiple-layered disk structure

Talke

2011

Microsyst Technol

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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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“…It is the background for the following calculations and discussions. Figure 1 shows a schematic diagram of the physical model which has been developed aiming at studying the lubricant transfer and accumulation quantitatively [8]. Three processes are involved in the lubricant transfer and accumulation.…”

Section: Lubricant Transfer and Accumulationmentioning

confidence: 99%

“…The temperature for the calculations is 35°C and the lubricant is Zdol. The relationship between Zdol vapor pressure and molecular weight is from thermal gravimetric measurements [8,15] at 35°C. Its viscosity at 35°C is from the measurements with a capillary viscometer [8].…”

Section: Parameters For the Calculation Of Lubricant Transfer And Accmentioning

confidence: 99%

“…The behavior of the molecularly thin lubricant on disk surface in such a narrow spacing plays a key role in building a stable slider-disk interface and has been studied extensively [4][5][6]. Lubricant transfer from disk to slider through evaporation and condensation and lubricant accumulation on slider have drawn attention recently [7,8]. The lubricant transfer and accumulation can cause the problems of flying stiction [9] and lubricant depletion on the disk surface.…”

Section: Introductionmentioning

confidence: 99%

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Dominant Factors in Lubricant Transfer and Accumulation in Slider-Disk Interface

Liu

2007

Tribol Lett

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Lubricant transfer from disk to slider and lubricant accumulation on slider are very important in designing a stable slider-disk interface of ultra-low spacing. In this article, the effects of different parameters on the lubricant transfer and accumulation are studied and the reasons behind the effects are explained. Furthermore, the time for the lubricant transfer to reach steady state is estimated. It is found that lubricant molecular weight plays a dominant role in the lubricant transfer and accumulation. Lubricant transfer and accumulation decrease dramatically with the increase in lubricant molecular weight. Lubricant transfer also strongly depends on lubricant thickness and bonding ratio on disk surface. A thinner lubricant and higher lubricant bonding ratio on disk surface reduce lubricant transfer obviously, which results in less lubricant accumulation. A diamond-like-carbon (DLC) overcoat of low adsorption area density on slider surface can reduce lubricant transfer and accumulation, especially for lubricant of low molecular weight. Lubricant accumulation increases with disk velocity and increases slightly with the decrease in slider flying height. Lubricant accumulation can be reduced by minimizing the area of slider pad. Lubricant transfer and accumulation become worse at higher ambient temperature. It takes seconds for lubricant of low molecular weight to reach steady transferred thickness and hours for lubricant of high molecular weight to reach the steady state.

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A model for lubricant flow from disk to slider

Cited by 70 publications

References 15 publications

Modeling laser induced lubricant depletion in heat-assisted-magnetic recording systems using a multiple-layered disk structure

Modeling laser induced lubricant depletion in heat-assisted-magnetic recording systems using a multiple-layered disk structure

Experimental study of slider–lubricant interaction with different slider designs

Dominant Factors in Lubricant Transfer and Accumulation in Slider-Disk Interface

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