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TECHNICAL PAPERS

The Spin-Off of Particles on a Magnetic Disk

[+] Author and Article Information
Yufeng Li, Vinod Sharma

Samsung Information Systems America, San Jose, CA 95134

J. Tribol 122(1), 293-299 (Jun 30, 1999) (7 pages) doi:10.1115/1.555356 History: Received February 01, 1999; Revised June 30, 1999
Copyright © 2000 by ASME
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References

Figures

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Conceptual diagram of the cross-section of a loose particle after being hit by a flying slider and getting embedded into the disk
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SEM micrographs of the three types of spherical particles used in the tests
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Optical micrographs of the particles inside a reference circle before and after a spin-off test
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Spin-off ratio of 10-micron diameter glass particle vs. disk radial location for various disk rotation speeds
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Spin-off ratio of 10-micron diameter polystyrene particle versus disk radial location for various disk rotation speeds
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Spin-off ratio of 2.5-micron diameter glass particle versus disk radial location for various disk rotation speeds
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(a) Spin-off ratio of 10-micron diameter glass particle for different disk groups at ID (25 mm) with various disk rotation speeds. (b) Spin-off ratio of 10-micron diameter glass particle for different disk groups at MD (35 mm) with various disk rotation speeds. (c) Spin-off ratio of 10-micron diameter particle disk for different disk groups at OD (45 mm) with various disk rotation speeds.
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(a) Effect of lubricant thickness and disk surface roughness on spin-off ratio at ID (25 mm). (b) Effect of lubricant thickness and disk surface roughness on spin-off ratio at MD (35 mm). (c) Effect of lubricant thickness and disk surface roughness on spin-off ratio at OD (45 mm).
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Three forces acting on a particle in the plane of a spinning disk surface: stiction force Fs, centrifugal force Fc, and air drag force Fa
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Schematic of the three-disk stack used in the air drag force test
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The effects of air drag force and centrifugal force on spin-off ratio
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The spin-off ratio of 10-micron glass particle versus centrifugal force
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Meniscus between a spherical particle and a flat disk surface
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The spin of ratios of different type of particles

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