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TECHNICAL PAPERS

Flying Height Modulation Due to Disk Waviness of Sub-5 nm Flying Height Air Bearing Sliders

[+] Author and Article Information
Brian H. Thornton, A. Nayak, D. B. Bogy

Computer Mechanics Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720

J. Tribol 124(4), 762-770 (Sep 24, 2002) (9 pages) doi:10.1115/1.1479699 History: Received February 09, 2001; Revised August 14, 2001; Online September 24, 2002
Copyright © 2002 by ASME
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References

Pitchford, T., 1999, “Head/Disk Interface Tribology Measurements for 100 Gb/in2 ,” Proceedings of the Symposium on Interface Technology Towards 100 Gbit/in2 , ASME, New York, TRIB-Vol. 9, pp. 83–90.
Menon, A., 1999, “Critical Requirements for 100 Gb/in2 Head/Media Interface,” Proceedings of the Symposium on Interface Technology Towards 100 Gbit/in2 , ASME, New York, TRIB-Vol. 9, pp. 1–9.
Menon,  A., 2000, “Interface Tribology for 100 Gb/in2 ,” Tribol. Int., 33, pp. 299–308.
Zhu, L.-Y., and Bogy, D. B., 1989, “Head-Disk Spacing Fluctuation Due to Disk Topography in Magnetic Recording Hard Disk Files,” Tribology and Mechanics of Magnetic Storage Systems, STLE Special Publication, SP-26, pp. 160–167.
Zeng,  Q. H., and Bogy,  D. B. , 1999, “Stiffness and Damping Evaluation of Air Bearing Sliders and New Designs With High Dampling,” ASME Journal of Tribology, 121, pp. 341–347.
Yao, W., Kuo, D., and Gui, J., 1999, “Effects of Disc Micro-Waviness in an Ultra-High Density Magnetic Recording System,” Proc. Of the Symposium on Interface Technology Toward 100 Gbit/in2 , ASME, New York, pp. 31–37.

Figures

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ABS of the 5 nm pico slider
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ABS of the 3.5 nm femto slider
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Dynamic characteristics of the pico slider
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Dynamic characteristics of the femto slider
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FH modulation for the (A) Pico and (B) Femto sliders for the 2.5 mm disk waviness wavelength
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FH modulation (peak-to-peak) as a function of waviness wavelength for the pico and femto sliders
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Comparison of the slider motion and the disk waviness, showing a phase difference in the two for different values of pitch
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FHM, absolute slider motion, and phase shift as a function of pitch of the 5 nm FH pico sliders for a waviness wavelength of 0.625 mm
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FHM, absolute slider motion, and phase shift as a function of pitch of the 3.5 nm FH femto sliders for a waviness wavelength of 0.625 mm
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Sequence of pressure profiles for the low pitch femto slider at different disk waviness phase locations. The trailing edge is in a waviness trough in (1), at the mean in (2), at a waviness peak in (3) and again at the mean in (4).
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Sequence of pressure profiles for the high pitch femto slider at different disk waviness phase locations. The trailing edge is in a waviness trough in (1), at the mean in (2), at a waviness peak in (3) and again at the mean in (4).
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The distance between the trailing edge of the side rails and the trailing edge of the center rail is about 0.15 mm for both the pico and femto slider designs
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The low pitch slider has pressure points at the trailing edge of the outer rails, which are about 0.15 mm from the transducer. When the waviness wavelength is 0.625 mm, or about 1/4 wavelength, the transducer phase lag is about 90 deg. When the waviness wavelength is 0.325 mm the transducer phase lag is almost 180 deg.
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FHM, absolute slider motion, and phase shift as a function of pitch of the 3.5 nm FH femto sliders for a waviness wavelength of 0.325 mm
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FH modulation as a function of waviness wavelength for the redesigned pico and femto sliders
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FHM, absolute slider motion, and phase shift as a function of waviness wavelength for the 4 nm FH pico slider
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FHM, absolute slider motion, and phase shift as a function of waviness wavelength for the 4 nm FH femto slider
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Dynamic characteristics of the redesigned pico slider
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Dynamic characteristics of the redesigned femto slider
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Geometric model for showing how absolute slider motion changes with waviness wavelength
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Absolute slider motion as a function of waviness wavelength found from the geometric model
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FHM of the pico and femto sliders as a function of waviness amplitude at a waviness wavelength of 0.208 mm
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ABS design of the redesigned femto slider and the pressure profile associated with this slider
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FHM, Slider Displacement and phase angle as a function of disk waviness wavelength for the redesigned femto slider

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