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Research Papers: Magnetic Storage

A Numerical Simulation Method to Evaluate the Static and Dynamic Characteristics of Flying Head Sliders on Patterned Disk Surfaces

[+] Author and Article Information
Takefumi Hayashi

Faculty of Informatics, High Technology Research Center, Kansai University, Ryozenji, Takatsuki-shi, Osaka 569-1095, Japanhayashi@res.kutc.kansai-u.ac.jp

Hideyo Yoshida

Department of Science, JRI Solutions, Limited, 1-5-3 Kudan-minami, Chiyoda-ku, Tokyo 102-0074, Japanyoshida.hideyo@jri-sol.co.jp

Yasunaga Mitsuya

Department of Micro-Nano Systems Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japanmitsuya@nuem.nagoya-u.ac.jp

J. Tribol 131(2), 021901 (Mar 03, 2009) (5 pages) doi:10.1115/1.3063696 History: Received November 20, 2006; Revised November 17, 2008; Published March 03, 2009

To quantitatively predict the static and dynamic characteristics of a flying head slider on a patterned disk surface, the “mixed averaging method” has been successfully applied to the molecular gas lubrication problem incurred by groove-shaped textures formed over the lubricating surface. First, formulation of the alternative direction implicit method using a “mixed averaged” film thickness was derived and implemented as a numerical simulation system. To analyze several types of surface patterns including their mixture patterns, the mixing ratio for the pressure flow and the shear flow were tabulated and interpolated at every mesh point, and then the spacing variations of typical sliders on a discrete track recording medium were demonstrated.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Discrete track media

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Figure 2

Unit pattern models (a) groove, (b) plateau, (c) pit, and (d) checker

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Figure 3

Dimensions of the rectangular pattern

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Figure 4

Slider configurations and their pressure profiles operating on a smooth disk surface. (a) Step-pad slider, (b) negative-pressure slider, and (c) taper-flat slider.

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Figure 5

Minimum spacing of the sliders on the longitudinal roughness

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Figure 6

Comparison of spacing variation between sliders. (a) Groove depth d=3 nm, (b) groove depth d=10 nm, and (c) groove depth d=25 nm.

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Figure 7

Minimum, maximum, and average h0 values of SP, NP, and TF sliders as a function of groove depth, d. (a) Step-pad type slider, (b) negative-pressure type slider, and (c) taper-flat type slider.

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