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TECHNICAL PAPERS

An Investigation of Slider Vibrations in Near Contact Recording Using a Digital Laser Doppler Vibrometer

[+] Author and Article Information
Shinji Yonemura

Hitachi, Ltd., Japan, Kanagawa, Odawara, Kozu, 2880, Japan

Lin Zhou, Frank E. Talke

University of California San Diego, Center for Magnetic Recording Research (CMRR), 9500 Gilman Drive, La Jolla, CA 92093-0401, U.S.A.

J. Tribol 125(3), 571-575 (Jun 19, 2003) (5 pages) doi:10.1115/1.1540124 History: Received March 27, 2002; Revised August 06, 2002; Online June 19, 2003
Copyright © 2003 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 Towards100 Gb/in2,9 , ASME, New York, pp. 1–9.
Knigge, B., Talke, F. E., Baumgart, P., and Harrison, J., “Slider Disk Contact Dynamics of Glide Heads and Proximity Recording Sliders using Joint Time-Frequency Analysis and Scalogram,” 1999, ASME Proceedings of the Symposium on Interface Technology Towards100 Gbit/in2,9 , ASME, New York, pp. 23–30.
Knigge,  B., and Talke,  F. E., 2001, “Slider Vibration Analysis at Contact Using Time-Frequency Analysis and Wavelet Transforms,” ASME J. Tribol., 123, pp. 548–554.
Knigge,  B., and Talke,  F. E., 2001, “Nonlinear Dynamic Effects at the Head-Disk Interface,” IEEE Trans. Magn., 37, pp. 900–905.
Kohira,  H., Tanaka,  H., Matsumoto,  M., and Talke,  F. E., 2001, “Investigation of Slider Vibrations Due to Contact with Smooth Disk Surface,” ASME J. Tribol., 123, pp. 616–623.
Sheng,  G., Chen,  Q., Hua,  W., and Liu,  B., 2001, “An Experimental Study of Dimple Separations and Head-Disk Impacts of Negative Pressure Slider in Unload Process,” IEEE Trans. Magn., 37(4), pp. 1859–1862.
Fu,  T. C., and Bogy,  D. B., 2000, “Analysis of Stresses Induced by Dynamic Load Head-Disk Contacts,” ASME J. Tribol., 122(1), pp. 233–237.
Zeng,  Q. H., Thornton,  B. H., Bogy,  D. B., and Bhatia,  C. S., 2001, “Flyability and Flying Height Modulation Measurement of Sliders with sub-10 nm Flying Heights,” IEEE Trans. Magn., 37(2), pp. 894–899.
Pineda, M., 2001, personal communication, Polytec PI Inc., CMRR, UCSD.

Figures

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Comparison of noise level of analog and digital LDV at low sampling frequency: (a) analog LDV (fs=200 kHz); and (b) digital LDV (fs=256 kHz).
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Comparison of noise level of analog and digital LDV at high sampling frequency: (a) analog LDV (fs=4 MHz); and (b) digital LDV (fs=5.12 MHz).
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Schematic illustration of an experimental setup
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Air bearing design and flying height of a slider: (a) air bearing surface; and (b) flying height as a function of disk speed.
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Spectrum of slider in-plane vibrations as a function of flying height at skew angle of 0 deg (0 dB=1 m): (a) h=7 nm; (b) h=6 nm; (c) h=5 nm; and (d) h=4 nm.
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Spectrum of slider out-of-plane vibrations as a function of flying height at skew angle of 0 degree (0 dB=1 m): (a) h=7 nm; (b) h=6 nm; (c) h=5 nm; and (d) h=4 nm.
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Spectrum of slider in-plane vibrations as a function of flying height at a skew angle of 10 degrees (0 dB=1 m): (a) h=7 nm; (b) h=6 nm; (c) h=5 nm; and (d) h=4 nm.
Grahic Jump Location
Spectrum of slider out-of-plane vibrations as a function of flying height at a skew angle of 10 degrees (0 dB=1 m): (a) h=7 nm; (b) h=6 nm; (c) h=5 nm; and (d) h=4 nm.
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AE signal intensity as a function of flying height
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Avalanche flying height of slider vibration detected by different observation methods

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