The “take-off” behavior of proximity recording sliders is investigated using acoustic emission and phase demodulated laser interferometry. A biquadratic surface fit of the air bearing surface is used to determine the position of the slider with respect to the disk. Acoustic emission data is examined in both the time and frequency domain to analyze the location of slider/disk contacts. Two distinct frequencies are observed in the frequency spectrum of the acoustic emission signal, corresponding to torsional mode and bending mode vibrations of the rigid slider. As the velocity increases, the magnitude of the torsional mode decreases relative to that of the bending mode, indicating that slider/disk contacts change from side rails contacts to trailing edge contacts.

Issue Section:
Research Papers
Topics:
Acoustic emissions, Interferometry, Disks, Air bearings, Lasers, Rails, Signals, Vibration
1.
Baugh, E., Weissner, S., and Talke, F. E., 1998, “Biquadratic Models for Slider Air Bearing Surface,” to be published in IEEE Trans. on Mag.
2.
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R. C.
,
Sundaram
 
R.
, and
Talke
 
F. E.
,
1988
, “
A Study of Acoustic Emission from Slider/Disk Interface in a 5-Inch Hard Disk Drive
,”
ASLE Special Publication: Tribology and Mechanics of Magnetic Storage System
, Vol.
5
, pp.
87
–
93
.
3.
Briggs
 
J. C.
,
Chang
 
M.-K.
, and
Tse
 
M.-K.
,
1992
, “
High Frequency Slider Vibrations during Asperity Impacts in Rigid Magnetic Disk System
,”
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181
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194
.
4.
Henze
 
D.
,
Mui
 
P.
,
Clifford
 
G.
, and
Davidson
 
R. J.
,
1989
, “
Multi-Channel Interferometric Measurements of Slider Flying Height and pitch
,”
IEEE Trans. on Magn.
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5
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3710
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3712
.
5.
Kita
 
T.
,
Kogure
 
K.
,
Mitsuya
 
Y.
, and
Nakanishi
 
T.
,
1980
, “
New Method of Detecting Contact Between Floating-Head and Disk
,”
IEEE Trans. on Magn.
, Vol.
16
, No.
5
, pp.
873
–
875
.
6.
McMillan, T. C., 1997, “The Characterization of Proximity Recording Air Bearing Sliders During Take-off Using Phase Demodulated Laser Interferometry and Acoustic Emission Analysis,” Ph.D., University of California, San Diego.
7.
McMillan
 
T. C.
, and
Talke
 
F. E.
,
1994
, “
Ultra-Low Flying Height Measurements using Monochromatic and Phase Demodulated Laser Interferometry
,”
IEEE Trans. on Magn.
, Vol.
30
, No.
6
, Part 1, pp.
4173
–
4175
.
8.
O’Brien
 
K.
, and
Harris
 
D.
,
1996
, “
Head/Disk Interface Contact Detection using a Refined Acoustic Emission Technique
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
118
, pp.
539
–
542
.
9.
Zhu
 
L-Y.
,
Hallamask
 
K. F.
, and
Bogy
 
D. B.
,
1988
, “
Measurement of Head/Disk Spacing with a Laser Interferometer
,”
IEEE Trans. on Magn.
, Vol.
24
, No.
6
, pp.
2739
–
2741
.
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