This paper describes the effect of ultra-thin liquid lubricant films on air bearing dynamics and flyability of nano-spacing flying head sliders in hard disk drives. The dynamics of a slider was monitored using Acoustic Emission (AE) and Laser Doppler Vibrometer (LDV). The disks with lubricant on one half of disk surface thicker than the other half as well as with uniform thickness lubricant were used to investigate the interactions between the slider and lubricant film experimentally. As a result, it was found that the flying height at which the slider-lubricant contact occurs depends on the lubricant film thickness and it increases as the lubricant film thickness increases. Its flying height is also dependent on the mobile lubricant film thickness under the condition that the total lubricant film thicknesses are the same and the lubricant bonded ratios are different. It increases as the mobile lubricant film thickness increases. The slider-lubricant contact flying height based on the theory for capillary waves is in good agreement with the experimental results. Regard to air bearing dynamics due to the slider-lubricant interactions, it also depends on the mobile lubricant thickness as well as the total lubricant film thickness. However, we should carry out more experimental and theoretical studies in order to confirm and verify these experimental results. In addition, the effect of nonuniform lubricant film thickness on head/disk interface dynamics has been studied. It was found that the lubricant film thickness nonuniformity caused by the slider-lubricant interactions could be observed.
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July 2004
Technical Papers
Effect of Ultra-Thin Liquid Lubricant Films on Dynamics of Nano-Spacing Flying Head Sliders in Hard Disk Drives
Norio Tagawa,
Norio Tagawa
Department of Mechanical Engineering, Faculty of Engineering, Kansai University, Suita, Osaka 564-8680, Japan
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Noritaka Yoshioka,
Noritaka Yoshioka
Production Engineering Center, Matsusita Electronic Components Co., LTD., Kadoma, Osaka 571-8506, Japan
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Atsunobu Mori
Atsunobu Mori
Department of Mechanical Engineering, Faculty of Engineering, Kansai University, Suita, Osaka 564-8680, Japan
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Norio Tagawa
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
Atsunobu Mori
Department of Mechanical Engineering, Faculty of Engineering, Kansai University, Suita, Osaka 564-8680, Japan
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division February 14, 2003; revised manuscript received November 11, 2003. Associate Editor: B. Bou-Sai¨d.
J. Tribol. Jul 2004, 126(3): 565-572 (8 pages)
Published Online: June 28, 2004
Article history
Received:
February 14, 2003
Revised:
November 11, 2003
Online:
June 28, 2004
Citation
Tagawa, N., Yoshioka, N., and Mori, A. (June 28, 2004). "Effect of Ultra-Thin Liquid Lubricant Films on Dynamics of Nano-Spacing Flying Head Sliders in Hard Disk Drives ." ASME. J. Tribol. July 2004; 126(3): 565–572. https://doi.org/10.1115/1.1739409
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