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TECHNICAL PAPERS

Static Friction and Initiation of Slip at Magnetic Head-Disk Interfaces

[+] Author and Article Information
S. Wang, K. Komvopoulos

Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Tribol 122(1), 246-256 (Jun 08, 1999) (11 pages) doi:10.1115/1.555349 History: Received November 23, 1998; Revised June 08, 1999
Copyright © 2000 by ASME
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References

Figures

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Lubricant film thickness measured by ellipsometry versus withdrawal speed of the disk in the dip-coating process for a lubricant concentration of 0.2 percent
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(a) Apparent friction force and (b) electric contact resistance versus time for a textured magnetic disk with a lubricant film thickness of 11 nm (λ=1.6)
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(a) Apparent friction force and (b) electric contact resistance versus time for a textured magnetic disk with a lubricant film thickness of 0.67 nm (λ=0.098)
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(a) Apparent friction force and (b) electric contact resistance versus time for a textured magnetic disk with a lubricant film thickness of 70 nm (λ=10)
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Molecular orientation in lubricant films of different thicknesses: (a) ultra-thin film and (b) relatively thick film
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(a) Initial stick time and (b) coefficient of static friction versus dimensionless lubricant film thickness for textured and untextured magnetic disks
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Elastic contact of two surface asperities: (a) smooth spherical asperities in contact without any lubricant, (b) smooth spherical asperities in contact with an intervening thin lubricant film, and (c) rough asperities in contact with an intervening thin lubricant film
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Model of the lubricated head-disk interface for different lubricant film thicknesses: (a) partial coverage by an ultra-thin lubricant film, (b) full coverage by an ultra-thin lubricant film, (c) partially filled interfacial cavities with meniscus formation, (d) increasing lubricant occupancy of cavities and formation of pillboxes, (e) maximum lubricant occupancy, and (f ) increased normal separation due to a relatively thick lubricant film
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Peak friction coefficient versus lubricant film thickness for (a) untextured disks and (b) textured disks. (The friction curve for untextured disks is plotted again in (b) to facilitate the comparison.)
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Free-body diagram of the slider before the initiation of slip
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Normal contact stress distribution at the head-disk interface as a superposition of a Hertzian stress distribution and an antisymmetric stress distribution due to the microscopic rotation of the slider. (The stresses are normalized by the maximum Hertzian pressure and the lateral distance by the half-contact length.)

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