Research Papers

Contact Force and Frictional Heating due to “Large” Particles in the Head Disk Interface

[+] Author and Article Information
Xinjiang Shen, David B. Bogy

Computer Mechanics Laboratory, 5146 Etcheverry Hall, University of California at Berkeley, Berkeley, CA 94720-1740

J. Tribol 130(1), 011015 (Jan 18, 2008) (7 pages) doi:10.1115/1.2805438 History: Received March 09, 2004; Revised July 11, 2007; Published January 18, 2008

Particles in the head disk interface may cause large contact forces acting on the slider as well as thermal asperities in the read/write signal. This is especially true for the close spacing required for 1Tbitin.2. In this paper, a three-body contact model is employed to study the effects of a particle entrapped between a slider and a disk. A criterion for determining a particle’s movement pattern is proposed. The study of particles in the head disk interface shows that large particles are likely to slide between the slider and disk interface, and the particles going through the trailing pad of an air bearing slider cause severe contact forces on the slider and generate large heat sources. The frictional heating study shows that the temperature around the magnetoresistive head increases to about 5°C for a single 200nm particle passing through the trailing pad of the slider. The effects of the particle size, disk material, and friction coefficient are also studied. It is found that the disk and slider materials and the frictional coefficient between the materials largely affect the contact force acting on the slider by an entrapped particle as well as the temperature rise at its contact region. It is also found that the friction coefficient largely affects a particle’s movement pattern in the head disk interface.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

A sketch of slider-disk assembly with particles and Cartesian coordinates

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Figure 2

Particle entrapped between two parallel surfaces and force diagram

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Figure 3

One air bearing slider used for studying large particle effects

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Figure 4

Size effect on contact force by a particle between a slider and an aluminum disk

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Figure 5

Disk material effect on the contact force and thermal spike on the slider by a 240nm particle

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Figure 6

Friction coefficient effect on the thermal spike on the slider

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Figure 7

Contact force map acting on the air bearing surface at t=0.2

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Figure 8

Temperature rise on the air bearing surface at t=0.95

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Figure 9

Resultant contact force history acting on the slider

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Figure 10

Resultant contact force moments’ histories acting on the slider



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