Effect of Intermolecular Forces on the Dynamic Response of a Slider

[+] Author and Article Information
Saurabh K. Deoras1

 Komag Inc., 1710 Automation Parkway, San Jose, CA 95131saurabh.deoras@komag.com

Frank E. Talke

Center for Magnetic Recording Research, Department of Mechanical and Aerospace Engineering, University of California, San Diego, San Diego, CA 92093-0401ftalke@ucsd.edu


Corresponding author.

J. Tribol 129(1), 177-180 (Jul 17, 2006) (4 pages) doi:10.1115/1.2390720 History: Received December 06, 2005; Revised July 17, 2006

A single-degree-of-freedom spring-mass-damper model has been developed to simulate the dynamic response of a typical magnetic recording slider under the effect of intermolecular forces. Thornton and Bogy (2003, IEEE Trans. Magn., 39(5), pp. 2420–2422) have previously reported that the slider “snaps” to the surface of the disk, below a certain “critical” flying height, due to the intermolecular forces. We have studied impulse response of the model to show that the slider can snap even at flying heights greater than the critical flying height and that the occurrance of snapping also depends on the magnitude of the applied impulse.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 2

Free body diagram of the slider

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Figure 4

Onset of snapping effect: Bifurcation diagram

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Figure 5

Half sine wave impulse of 2ms duration

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Figure 6

Impulse response at a flying height of 3.5nm

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Figure 7

Impulse response at a flying height of 2.9nm

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Figure 8

Snapping of slider at a flying height of 2.9nm

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Figure 9

Map of the stability nominal flying height of the slider as a function of impulse magnitude

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Figure 3

Model methodology for slider dynamics

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Figure 1

Potential energy curve between two atoms




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