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TECHNICAL PAPERS

Effect of Ultra-Thin Liquid Lubricant Films on Dynamics of Nano-Spacing Flying Head Sliders in Hard Disk Drives

[+] Author and Article Information
Norio Tagawa, Atsunobu Mori

Department of Mechanical Engineering, Faculty of Engineering, Kansai University, Suita, Osaka 564-8680, Japan

Noritaka Yoshioka

Production Engineering Center, Matsusita Electronic Components Co., LTD., Kadoma, Osaka 571-8506, Japan

J. Tribol 126(3), 565-572 (Jun 28, 2004) (8 pages) doi:10.1115/1.1739409 History: Received February 14, 2003; Revised November 11, 2003; Online June 28, 2004
Copyright © 2004 by ASME
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References

Menon, A. K., 1999, “Critical Requirement for 100 Gb/in2 Head/Media Interface,” Proceeding of the Symposium on Interface Technology Toward 100 Gb/in2, TRIB-Vol. 9, pp. 1–9.
Kuo,  D., Ma,  X., Tang,  H., and Gui,  J., 2001, “Effect of Non-Uniform Lubricant Distribution and De-Wetting on Head-Disk Dynamics,” IEEE Trans. Magn., 37(4), pp. 1836–1838.
Ma,  X., Kuo,  D., Chen,  J., Tang,  H., and Gui,  J., 2002, “Effect of Lubricant on Flyability and Read-Write Performance in the Ultra-Low Flying Regime,” ASME J. Tribol., 124(2), pp. 259–265.
Kohira, H., Tanaka, H., Matsumoto, M., and Talke, F., 2000, “Investigation of Slider Vibration Due to Contact With a Smooth Disk Surface,” presented at the ASME Trib. Conf. 2000, Seatle, WA, Oct. 1–4.
Ma,  X., Tang,  H., Stirniman,  M., and Gui,  J., 2002, “Lubricant Thickness Modulation Induced by Head-Disk Dynamics Interactions,” IEEE Trans. Magn., 38(1), pp. 112–117.
Toney,  M. F., Mate,  C. M., and Leach,  K. A., 2000, “Roughness of Molecularly Thin Perfluoropolyether Polymer Films,” Appl. Phys. Lett., 77, pp. 3296–3298.
Mate,  C. M., Toney,  M., and Leach,  K. A., 2001, “Roughness of Thin Perfluoropolyether Lubricant Films: Influence on Disk Drive Technology,” IEEE Trans. Magn., 37(4), pp. 1821–1823.
Pit,  R., Marchon,  B., Meeks,  S., and Velidandla,  V., 2001, “Formation of Lubricant ‘Moguls’ at the Head/Disk Interface,” Tribol. Lett., 10, pp. 133–142.

Figures

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Experimental setup of flyability test
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Test dual-etched negative pressure pico-slider
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AFM image of test glass disk surface
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Lubricant coating patterns
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Lubricant film thickness profiles
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Relationship between LDV signal and AE signal
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LDV signals and FFT results at 3.9 m/s
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LDV signals and FFT results at 3.3 m/s
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LDV signals and FFT results at 2.0 m/s
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Lubricant film thickness versus flying height at which the slider-lubricant contact occurred
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Disk surface velocity versus LDV RMS values
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Lubricant film thickness profiles at 4 m/s
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Lubricant film thickness profiles at 3 m/s
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Lubricant film thickness profiles at 2 m/s
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AE signals for a flying head slider bearing

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