Lubricant Flow and Evaporation Model for Heat-Assisted Magnetic Recording Including Functional End-Group Effects and Thin Film Viscosity

Dahl, Joanna B.; Bogy, David B.

doi:10.1007/s11249-013-0190-2

Cited by 26 publications

(11 citation statements)

References 51 publications

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“…Initially all of the lubricant within the irradiated zone was removed, creating a depression in the lubricant equal to approximately the initial thickness, 12 Å . Thereafter, a slow The shape of the lubricant profile after irradiation contains information about the processes causing its formation [22]. For instance, thermocapillary shear stress is thought to be one of the dominant mechanisms causing lubricant displacement during HAMR writing and is derived from the temperature-dependent change in the surface tension.…”

Section: Resultsmentioning

confidence: 99%

“…For spots size *50 nm diameter and smaller, the thermocapillary stress dominates, and when the spot size approaches 1 lm and larger, evaporation dominates [22]. This is because the thermocapillary shear stress depends linearly on the thermal gradient, and small spots have larger gradients.…”

Section: Resultsmentioning

confidence: 99%

“…[20], which yields a heat of vaporization of 68.112 kJ/mol and a pre-exponential term of 685,415 Torr and intrinsic lubricant material properties (the lubricant density q and M w its molecular weight). Terms for the temperature-dependent mass flux containing the lubricant curvature have been omitted since they are assumed to be small due to the large thermal spot size [22]. Equation 1 was numerically integrated; the obtained predicted mass flux converted to a film thickness change is plotted versus temperature in Fig.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Laser-Induced Thermo-Desorption of Perfluoropolyether Lubricant from the Surface of a Heat-Assisted Magnetic Recording Disk: Lubricant Evaporation and Diffusion

et al. 2015

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Heat-assisted magnetic recording (HAMR) storage technology will thermally stress the lubricant film typically applied to the storage disk surface. Different lubricant loss and morphology change mechanisms have been hypothesized to occur during information writing. A loss to of the lubricant film will dramatically affect its overall mechanical and chemical performance of the headdisk interface, decreasing its reliability and its durability. Thus an all optical pump-probe method was used to study the effect of fast thermal transients (10 6 K/s) on a lubricant film on HAMR media. Thermal transients (Bhushan and Cheng in J Appl Phys 81:5390, 1997) with peak temperatures above the HAMR media Curie temperature (T c ) were found to remove by evaporation the lubricant within the heated region creating a lubricant depression in the otherwise continuous film. No accumulation of lubricant volume was observed to take place in the cooler regions of the thermal spot, indicating that thermocapillary shear stress is not an important mechanism of lubricant thickness change with the optical spot size used (65 lm). The onset of lubricant loss was observed to begin at approximately 610 K and was totally removed at 823 K. The change in depth of the lubricant depression with time showed that no structural terms contributed to the disjoining pressure for the lubricant thickness range studied. From this change, the diffusion coefficient of the lubricant on the carbon overcoat surface was determined to be 1 9 10 -13 m 2 /s by fitting Fick's second law to the normalized lubricant thickness. The importance of these observations on the operating HAMR head-disk interface is discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Laser-Induced Thermo-Desorption of Perfluoropolyether Lubricant from the Surface of a Heat-Assisted Magnetic Recording Disk: Lubricant Evaporation and Diffusion

et al. 2015

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“…And the lubricant transferring is influenced by the local pressure difference and the number of functional groups on the disk surface [7]. Furthermore, the lubricant temperature affects the lubricant transferring sharply [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study of formation and development of lubricant bridge in head-disk interface using molecular dynamic method

et al. 2016

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The lubricant bridge connecting the slider and disk will significantly deteriorate the read-write stability of the hard disk drive (HDD). This paper builds a model of disk-lubricant-slider system. The coarse-grained bead-spring model is used to represent perfluoropolyethers (PFPE) molecules. And the molecular dynamic method is used to study the formation time and the molecule number of the lubricant bridge under different disk rotation speeds and slider flying heights. Furthermore, the influence of lubricant bridge on the pressure acting on the slider pad is also studied. Index Terms -Head disk interface, lubricant bridge, molecular dynamic method

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“…The harsh heating condition can damage traditional lubricants and reduce their lifetime due to evaporation, decomposition and thermal depletion. 4,5 However, some of the lubricant depletion can be recovered due to reflow after some period of time. The reflow behavior can help to cure the lubricant depletion and reduce the chance of hard head disk interface (HDI) failure.…”

mentioning

confidence: 99%

Lubricant reflow after laser heating in heat assisted magnetic recording

Rodriguez-Mendez

Xiong

et al. 2015

Journal of Applied Physics

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Lubricant Flow and Evaporation Model for Heat-Assisted Magnetic Recording Including Functional End-Group Effects and Thin Film Viscosity

Cited by 26 publications

References 51 publications

Laser-Induced Thermo-Desorption of Perfluoropolyether Lubricant from the Surface of a Heat-Assisted Magnetic Recording Disk: Lubricant Evaporation and Diffusion

Laser-Induced Thermo-Desorption of Perfluoropolyether Lubricant from the Surface of a Heat-Assisted Magnetic Recording Disk: Lubricant Evaporation and Diffusion

Study of formation and development of lubricant bridge in head-disk interface using molecular dynamic method

Lubricant reflow after laser heating in heat assisted magnetic recording

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