The dynamics of pico sliders is investigated during scratch impact using laser Doppler vibrometry. Air-bearing frequencies and damping of the pitch-2 frequency are studied as a function of disk velocity for lubricant thickness values of 1.6 nm, 1.0 nm and 2.0 nm. Time-frequency analysis is performed to study the instantaneous air-bearing frequencies. System identification methods are used to model the response of the slider after a scratch impact. The results indicate that the slider dynamics and the damping coefficients are affected by the disk velocity and lubricant thickness and also possibly by disk micro-waviness.
Issue Section:
Technical Papers
1.
Tanaka
, H.
, Yonemura
, S.
, and Tokisue
, H.
, 2001
, “Slider Dynamics During Continuous Contact With Textured and Smooth Disks in Ultra Low Flying Height
,” IEEE Trans. Magn.
, 37
(2
), pp. 906
–911
.2.
Menon, A. K., 1999, “Critical Requirements for 100 Gb/in2 Head/Disk Interface,” ASME Proc. Symp. Interface Technology Towards 100 Gb/in2, 9, ASME, New York, pp. 1–9.
3.
Knigge
, B.
, and Talke
, F.
, 2001
, “Dynamics of Transient Events at the Head/Disk Interface
,” Tribol. Int.
, 34
(7
), pp. 453
–460
.4.
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
, pp. 102
–107
.5.
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
(5
), pp. 2448
–2450
.6.
Liu, B., Zhu, Y. L., and Li, Y. H., 1999, “Experimental Study of Slider-Disk Interaction in a Nanometer Spaced Head-Disk Interface,” IEICE Trans. Electron., 1999, 7(1), pp. 2148–2154.
7.
Zhou
, L.
, Talke
, F.
, and Kato
, K.
, 2002
, “The Effect of Slider Surface Texture on Slider Flyability and Lubricant Migration Under Near Contact Conditions
,” Tribol. Int.
, 36
, pp. 269
–277
.8.
Xu
, J.
, Tokisue
, H.
, Tanaka
, H.
, and Matsumota
, M.
, 2002
, “Contact Vibrations of Micro-Textured Sliders
,” ASME J. Tribol.
, 124
(2
), pp. 281
–287
.9.
Liu
, Y.
, Jiaa
, C. L.
, and Eltoukhy
, A.
, 1997
, “Acoustic Emission Study of Lubricant Effect on Proximity Contact Recording
,” IEEE Trans. Magn.
, 33
(5
), pp. 3160
–3162
.10.
Kohira
, H.
, Tanaka
, H.
, Matsumota
, M.
, and Talke
, F.
, 2001
, “Investigation of Slider Vibrations Due to Contact With a Smooth Disk Surface
,” ASME J. Tribol.
, 123
(3
), pp. 616
–623
.11.
Gao
, C.
, Lee
, Y. C.
, Chao
, J.
, and Russak
, M.
, 1995
, “Dip-Coating of Ultra-Thin Liquid Lubricant and Its Control for Thin-Film Magnetic Hard Disks
,” IEEE Trans. Magn.
, 31
(6
), pp. 2982
–2984
.12.
Deoras
, S.
, Chun
, S.
, Vurens
, G.
, and Talke
, F.
, 2003
, “Spreading and Mobility Analysis of PFPE Lubricants Using Surface Reflectance Analyzer (SRA)
,” Tribol. Int.
, 36
, pp. 241
–246
.13.
Cohen, L., 1995, Time-Frequency Analysis, Prentice-Hall PTR.
14.
Harrison
, J.
, Altshuler
, K.
, and Huynh
, C.
, 1999
, “An Explanation of the Observed Frequency Domain Behavior of Head-Disk Interface Resonances in the Proximity Recording Regime
,” IEEE Trans. Magn.
, 35
(2
), pp. 933
–938
.15.
Ljung, L., 1999, System Identification, Prentice-Hall PTR.
Copyright © 2004
by ASME
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