Head-Disk Dynamics in the Flying, Near Contact, and Contact Regimes

[+] Author and Article Information
Run-Han Wang, Vasant Nayak, Fu-Ying Huang, Wade Tang, Francis Lee

IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120

J. Tribol 123(3), 561-565 (Jul 06, 2000) (5 pages) doi:10.1115/1.1308037 History: Received February 17, 2000; Revised July 06, 2000
Copyright © 2001 by ASME
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Menon, A. K., 1999, “Critical Requirements for 100 Gb/in2 Head/Media Interface,” Proceeding of the Symposium on Interface Technology Towards 100 Gb/in2 , Bhatia, C. S. et al., eds., ASME, Trib-vol. 9, pp. 1–9.
Ono, K., and Takahashi, K., 1998, “Analysis of Bouncing Vibrations of a 2-DOF Tripad Contact Slider Model with Air Bearing Pads Over a Harmonic Wavy Disk Surface,” ASME 98-TRIB-58, pp. 1–10.
Brown, B., Hu, H. L., Klaassen, K. B., Lum, J. J., Van Peppen, J. C. L., and Weresin, W. E., 1988, “Method and Apparatus for In-situ Measurement of Head/recording Medium Clearance,” U.S. Patent 4,777,544.


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Off-track magnetic signal amplitude from spectrum analyzer versus time with resolution and video bandwidth of 1 MHz. The line at 11.2 ms indicates the spindle index.
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Magnetic track profile with the two slopes indicating the sensitivity to off-track position
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Frequency spectrum of the off-track magnetic signal with a peak at 2.26 kHz (T1 mode) on a type Y suspension. A nearby peak at 2.08 kHz is probably the B1+T1 mode. Disk rotated at 4800 RPM.
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AE-rms (dashed line), friction (solid line) and FH (triangle) as a function of velocity
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Frequency spectrum of the transverse vibration of the suspension load beam taken with scanning LDV at 7200 RPM on a type Y suspension
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Air flow induced magnetic off-track jitter of T1 mode as a function of the disk velocity. Two of type Y (Y1,Y2), one each of types A and M suspensions are shown.
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Magnetic off-track jitter versus the maximum transverse vibration amplitude at the anti-node of the suspension (at various disk rotation rates in K RPM labeled at each point) for all three types of suspensions at the T1 mode frequency
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(a) AE signal in one revolution in near-contact regime. If harmonics of the disk rotational frequency were coincident with the suspension T1 mode, the off-track jitter was enhanced (b) otherwise small jitter was observed (c).
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Magnetic and AE signals over one revolution in the near-contact regime. Occasionally contact induces slider instability (a,b). In the contact regime there is significant magnetic signal modulation (c). Same ordinate scales were used on all three graphs for magnetic or AE signals.
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Vertical spacing modulation of the magnetic signal at the air bearing mode in the contact regime versus time (a), and the frequency spectrum at velocities of 3.2 and 2.9 m/s (b,c respectively)
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Frequency spectrum of the off-track magnetic signal modulation at suspension modes in the contact regime



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