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TECHNICAL PAPERS

Effect of Lubricant on Flyability and Read-Write Performance in the Ultra-Low Flying Regime

[+] Author and Article Information
Xiaoding Ma, David Kuo, Jianping Chen, Huan Tang, Jing Gui

Seagate Recording Media, 47010 Kato Road, Fremont, CA 94538

J. Tribol 124(2), 259-265 (May 29, 2001) (7 pages) doi:10.1115/1.1398547 History: Received January 25, 2001; Revised May 29, 2001
Copyright © 2002 by ASME
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References

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O’Connor,  T. M., Jhon,  M. S., Bauer,  C. L., Min,  B. G., Yoon,  D. Y., and Karis,  T. E., 1995, “Surface Diffusion and Flow Activation Energies of Perfluoropolyalkylether,” Tribol. Lett., 1, pp. 219–223.
Min,  B. G., Choi,  J. W., Brown,  H. R., Yoon,  D. Y., O’Connor,  T. M., and Jhon,  M. S., 1995, “Spreading Characteristics of Thin Liquid Films of Perfluoropolyalkylethers on Solid Surfaces. Effect of Chain-end Functionality and Humidity,” Tribol. Lett., 1, pp. 225–232.
Ma,  X., Gui,  J., Smoliar,  L., Grannen,  K., Marchon,  B., Jhon,  M. S., and Bauer,  C. L., 1999, “Complex Terraced Spreading of Perfluoropolyalkylether Films on Carbon Surfaces,” Phys. Rev. E, 59, pp. 722–727.
Ma,  X., Gui,  J., Smoliar,  L., Grannen,  K., Marchon,  B., Jhon,  M. S., and Bauer,  C. L., 1999, “Spreading of Perfluoropolyalkylether Films on Amorphous Carbon Surfaces,” J. Chem. Phys., 110, pp. 3129–3137.
Ma,  X., Gui,  J., Grannen,  K., Smoliar,  L., Marchon,  B., Jhon,  M. S., and Bauer,  C. L., 1999, “Spreading of PFPE Lubricants on Carbon Surfaces: Effect of Hydrogen and Nitrogen Content,” Tribol. Lett., 6, pp. 9–14.
Ma,  X., Bauer,  C. L., Jhon,  M. S., Gui,  J., and Marchon,  B., 1999, “Monte Carlo Simulations of Liquid Spreading on a Solid Surface: Effect of End-Group Functionality,” Phys. Rev. E, 60, pp. 5795–5801.
Ma,  X., Gui,  J., Marchon,  B., Jhon,  M. S., Bauer,  C. L., and Rauch,  G. C., 1999, “Lubricant Replenishment on Carbon Coated Discs,” IEEE Trans. Magn., 35, pp. 2454–2456.
Yao, W., Kuo, D., and Gui, J., 1999, “Effects of Disc Micro-waveness in an Ultra-High Density Magnetic Recording System,” TRIB-Vol. 9, Proceedings of the Symposium on Interface Technology Towards 100 Gbits/in2, ASME, New York, pp. 31–37.
Chen,  J., Richter,  H., Wang,  L., and Minuhin,  V., 1999, “Texture Noise and its Impact on Recording Performance at High Recording Density,” IEEE Trans. Magn., 35, pp. 2727–2729.
Klein, D. L., and Vurens, G. H., 1999, “Measurements of Thin Film Disks by Surface Reflectance Analysis,” Proceedings of SPIE 3619–02.
Lee, S., 2000, private communications.
Wang,  S., Chang,  Y. C., and Liu,  J. J., 1999, “A Novel Drag Test for Observing Lubricant Redistribution Due to Head-Disk Interactions,” IEEE Trans. Magn., 35, pp. 2448–2450.

Figures

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HDI lubricant images after lubrication process (brighter area indicates thicker lubricant)
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Lubricant steps at the interface of thick lubricant region and thin lubricant region
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Experimental setup of flyability test
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AE, LDV, and spindle index (top, middle, and bottom traces) signals for a head flying at (a) 12.7 m/s and (b) 5.4 m/s over a 2 nm Zdol step-lubed disk
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AE, LDV, and spindle index (top, middle, and bottom traces) signals for a head flying at (a) 12.7 m/s and (b) 5.1 m/s over a 4 nm Zdol step-lubed disk
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HDI lubricant images before and after flying test
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Left: Lubricant thickness profiles along radial direction for Z-25. Top curve—average over thick lubricant region; bottom curve—average over thin lubricant region. Right: Lubricant thickness profiles along circumferential direction inside the tracks.
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Left: Lubricant thickness profiles along radial direction for Zdol. Top curve—average over thick lubricant region; bottom curve—average over thin lubricant region. Right: lubricant thickness profiles along circumferential direction inside the tracks.
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Read-back signal as a function of step thickness for Z-25
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Magnetic spacing loss vs. lubricant step thickness

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