Performance of Sliders Flying Over Discrete-Track Media

[+] Author and Article Information
Jianhua Li, Junguo Xu, Yuki Shimizu

Central Research Laboratory, Hitachi Ltd., 1, Kirihara, Fujisawa, Kanagawa, 252-8588, Japan

J. Tribol 129(4), 712-719 (Jun 11, 2007) (8 pages) doi:10.1115/1.2768069 History: Received May 07, 2006; Revised June 11, 2007

A simulation method in which grooves are virtually distributed on the slider air bearing instead of on the grooved medium surface has been developed and used to investigate the performance of sliders flying over the surface of a discrete-track medium. The simulated flying height loss due to a discrete-track medium coincides well with the measured data, whereas the average-estimation method overestimates flying height loss. Among the characteristics of a slider flying over the surface of a discrete-track medium that were studied are the flying attitude, the effect of groove parameters on flying profile, and the flying height losses due to manufacturing variation and altitude. The results indicate that when a slider is flying over the surface of a discrete-track medium, it will have a higher 3σ of flying height, be more sensitive to altitude, and will have a greater flying height loss.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Head-disk interface of the DTM recording system

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Figure 2

Local spacing in actual and modeled slider-DTM interfaces: (a) Actual slider-DTM interface and (b) modeled slider-DTM interface

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Figure 3

A two-step micro air bearing and, for two groove depths, its load capacity as a function of groove width: (a) Two-step micro air bearing and (b) load capacity versus groove width

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Figure 4

Load capacity versus groove depth and width for various flow factor models of the micro air bearing shown in Fig. 3 (W100 and W50 indicate groove widths of 100nm and 50nm)

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Figure 5

Sliders with two models of distributed grooves, and flying attitude versus radius for them and for a slider without distributed grooves: (a) model A, (b) model B, (c) flying height versus radius, and (d) pitch angle versus radius

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Figure 6

Pressure distributions on ABS for DTM with groove widths of (a)18μm, (b)14.2μm, and (c)11.35μm

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Figure 7

Various groove distributions on slider surface (grooves shown in black) and flying profiles of sliders with them: (a) models, (b) flying height versus radius, and (c) pitch angle versus radius

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Figure 8

Slider’s flying attitudes for three kinds of DTM and a conventional track medium: (a) flying height versus radius and (b) pitch angle versus radius

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Figure 9

Slider’s flying height losses versus land area ratio: (a) simulated and average-estimation results and (b) average-estimation results, simulation at MD results, and measured data

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Figure 10

Slider’s pitch angle losses versus land area ratio

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Figure 11

Slider’s flying height losses versus groove depth by simulation and average estimation

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Figure 12

Slider’s pitch angle losses versus groove depth

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Figure 13

Effect of DTM groove depth variation on flying height

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Figure 14

Flying attitude of slider flying a DTM at altitudes of 0m and 3000m

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Figure 15

Head-DTM interface and its parameters

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Figure 16

Current gap flying height, conventional flying height and average height versus land area ratio




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