Slider Pitch Moment Associated With Dimple Friction

[+] Author and Article Information
Li-Yan Zhu, Chao-Hui Yang, Yen Fu, Ellis Cha

 SAE Magnetics (H.K.), US Office, 100 S. Milpitas Blvd., Milpitas, CA 95035

J. Tribol 128(4), 705-710 (Jun 13, 2006) (6 pages) doi:10.1115/1.2345394 History: Received February 25, 2004; Revised June 13, 2006

In the design of a magnetic recording disk file, pitch moment exerted by the flexure on the slider is usually treated as a product of flexure pitch static attitude and pitch-stiffness (kp), both measured in the absence of preload (gram-load). However, a slider operates in the presence of preload, which permits a large dimple friction to exist. We shall show by elementary beam theory that the pitch moment due to dimple friction is appreciable. The lever-arm of dimple friction is proportional to the bow height, and is independent of the slope of the flexure. To minimize the pitch moment associated with dimple friction, hence improving fly-height distribution, the flexure must bow toward the disk. These results are confirmed by optical fly-height tests.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Top view of a typical flexure

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Figure 2

Side-view of a typical HGA

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Figure 3

The tip of an HGA, showing a flexure with some electrical transmission lines

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Figure 4

A simple model of the flexure (not to scale)

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Figure 5

A flexure modeled as a set of wires balanced over an imaginary cord

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Figure 6

The fly-height did not return to its original value after the load beam was tapped

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Figure 7

The slider fly-height settles in approximately 400ms after loading

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Figure 8

Fly-height modulation increases with the lever-arm of dimple friction

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Figure 9

A Cartesian coordinate system Oxy, and a curvilinear axis O1s on the cantilever




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