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TECHNICAL PAPERS

Investigation of Slider Vibrations Due to Contact With a Smooth Disk Surface

[+] Author and Article Information
Hidekazu Kohira

Data Storage & Retrieval Systems Division, Hitachi Ltd., 2880 Kozu, Odawara-shi, Kanagawa-ken, 256-8510, Japane-mail: h-kohira@str.hitachi.co.jp

Hideaki Tanaka, Masaaki Matsumoto, Frank E. Talke

Center for Magnetic Recording Research, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0401

J. Tribol 123(3), 616-623 (Jul 12, 2000) (8 pages) doi:10.1115/1.1308045 History: Received February 29, 2000; Revised July 12, 2000
Copyright © 2001 by ASME
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References

Menon, A. K., 1999, “Critical Requirements for 100 Gb/in2 Head/Disk Interface,” ASME Proceedings of the Symposium on Interface Technology Towards 100 Gbit/in2 , Vol. 9, pp. 1–9.
Meyer,  D., Boutaghou,  Z., and Wei,  B., 1997, “Proximity Recording—The Concept of Self Adjusting Fly Heights,” IEEE Trans. Magn., 33, No. 1, pp. 912–917.
Hsia, Y. T., and Donovan, M. J., 1996, “The Design and Tribology of Tripad Sliders for Pseudo-Contact Recording in Magnetic Hard Disk Drives,” ASME Tribology of Contact Near-Contact Recording for Ultra High Density Magnetic Storage, Vol. 6, pp. 17–23.
Ono,  K., Iida,  K., and Takahashi,  K., 1997, “Effect of Slider Mass, Contact Stiffness and Contact Damping on Bouncing Vibrations of a Single-DOF Contact Slider Model,” Trans. Jpn. Soc. Mech. Eng., Ser. C, 63, No. 614, pp. 3352–3360.
Ono,  K., Takahashi,  K., and Iida,  K., 1999, “Computer Analysis of Bouncing Vibrations and Tracking Characteristics of a Point Contact Slider Model Over Random Disk Surface,” ASME J. Tribol., 121, No. 3, pp. 587–595.
Hsia,  Y. T., Rottmayer,  B., and Donovan,  M. J., 1996, “A New Wear Measurement Technique for Pseudo-Contact Magnetic Recording Heads,” IEEE Trans. Magn., 32, No. 5, pp. 3750–3752.
Kohira,  H., and Talke,  F. E., 2000, “Wear Measurements of Diamond-Like Carbon Coated Proximity Recording Sliders Using Raman Spectroscopy,” ASME J. Tribol., 122, No. 1, pp. 288–292.
Zeng,  Q. H., and Bogy,  D. B., 1999, “Experimental Evaluation of Stiffness and Damping of Slider-Air Bearings in Hard Disk Drives,” ASME J. Tribol., 121, No. 1, pp. 102–107.
Zeng,  Q. H., Chen,  L. S., and Bogy,  D. B., 1997, “A Modal Analysis Method for Slider Air Bearing in Hard Disk Drives,” IEEE Trans. Magn., 33, No. 5, pp. 3124–3126.
Knigge, B., Talke, F. E., Baumgart, P., and Harrison, J., 1999, “Slider Disk Contact Dynamics of Glide Heads and Proximity Recording Sliders using Joint Time-Frequency Analysis and Scalogram,” ASME Proceedings of the Symposium on Interface Technology Towards 100 Gbit/in2 , Vol. 9, pp. 23–30.
Suzuki,  S., and Nishihara,  H., 1996, “Study of Slider Dynamics over Very Smooth Magnetic Disks,” ASME J. Tribol., 118, No. 2, pp. 382–387.
Harrison,  J., Altshuler,  K., and Huynh,  C., 1999, “An Explanation of the Observed Frequency Domain Behavior of Head-Disk Interface in the Proximity Recording Regime,” IEEE Trans. Magn., 35, No. 2, pp. 933–938.
Hanchi, J., Polycarpou, A. A., and Boutaghou, Z., 1999, “Tribology of Contact Head-Disk Interfaces,” ASME Proceedings of the Symposium on Interface Technology Towards 100 Gbit/in2 , Vol. 9, pp. 17–22.
Menon,  A. K., and Boutaghou,  Z., 1998, “Time-frequency Analysis of Tribological Systems—Part I: Implementation and Interpretation,” Tribol. Int., 31, No. 9, pp. 501–510.

Figures

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Schematic of experimental setup
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Displacement of slider C versus time. Top: point A near trailing edge. Bottom: point B near leading edge. 3a: 5 m/s; 3b: 3.5 m/s; 3c: 2 m/s.
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Power spectral density of vibrations for slider C measured at point A
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Frequency dependence on velocity, slider C and disk D
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Magnitude of “f1” frequency along slider width, slider C, and disk D, 3.5 m/s
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Magnitude of “f2” frequency along slider length, slider C, and disk D, 3.5 m/s
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Displacement of slider E versus time. Top: point A near trailing edge. Bottom: point B near leading edge. 8a: 7 m/s; 8b: 5 m/s; 3c: 3.5 m/s.
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Power spectral density of vibrations for slider E measured at point A
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3σ of displacement for point A near trailing edge versus time, disk D
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3σ of displacement for point A near trailing edge versus pitch angle, disk D
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3σ of displacement for point A near trailing edge versus crown height, disk D
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Slider/disk contact conditions. Top: large pitch angle and zero crown. Middle: low pitch angle and large crown. Bottom: contact at leading edge.
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a, Velocity and displacement of slider D at point A versus time. Top: velocity. Bottom: displacement, disk D, 3.5 m/s. b, short-time Fourier transform of the displacement of slider D at point A, disk D, 3.5 m/s.
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Glide avalanche height of sample sliders measured using slider C versus lubricant thickness
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Velocity and displacement of slider C at point A at disk velocity of 3.5 m/s versus time. a, lubricant thickness: 1.5 nm; b, 2.5 nm; c, 3.5 nm.
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Top: flying height without lubricant (17a). Middle: flying height with uniform lubricant (17b). Bottom: flying height with scattered lubricant (17c).

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