We experimentally and theoretically investigated in detail bouncing vibrations of a flying head slider in the near-contact region between the head and disk surface. By changing the Z-height in the experiment, we evaluated the effect of the pitch static angle on the ambient pressure at which unstable bouncing vibration starts and stops. We found that the touch-down and take-off pressure hysteresis decreased as the pitch static angle increased even though the flying height at the trailing edge decreased slightly. From detailed measurement of the slider dynamics at the threshold of the bouncing vibration, we found that the trailing edge of the slider was first attracted to the disk. As the pitch static angle decreased, the magnitude of the first drop of the trailing edge increased and the bouncing vibration amplitude increased more rapidly. We also measured the mode of the bouncing vibration by using two laser Doppler vibrometers simultaneously. By using an improved two-degree-of-freedom slider model, in which the small micro-waviness and the shearing force of the lubricant were taken into account, we could analyze the touch-down/take-off hysteresis, mode, and destabilization process of the bouncing vibration similar to the experimental results. We also theoretically found that either self-excited bouncing vibration with lower pitch frequency or forced vibration with higher pitch frequency was generated, depending on the magnitudes of the micro-waviness and the disturbance.

1.
Ono
,
K.
, 2004, “
Design Considerations of a Contact Slider and Bouncing Vibration in Near-Contact Regime
,”
IEEE Trans. Magn.
0018-9464,
40
(
4
), pp.
3136
3141
.
2.
Yamane
,
M.
,
Ono
,
K.
, and
Yamaura
,
H.
, 2003, “
2-DOF Analysis of Friction-Induced Slider Vibrations in a Near-Contact Regime
,” 2003TRIB-046,
Proceedings of the 2003 STLE/ASME International Joint Tribology Conference
, Ponte Verda Beach, FL.
3.
Ono
,
K.
,
Yamane
,
M.
, and
Yamaura
,
H.
, 2005, “
Experimental and Analytical Study of Bouncing Vibrations of a Flying Head Slider in a Near-Contact Regime
,”
ASME J. Tribol.
0742-4787,
127
, pp.
376
386
.
4.
Xu
,
J.
, and
Tsuchiyama
,
R.
, 2003, “
Ultra-Low-Flying-Height Design From the Viewpoint of Contact Vibration
,”
Tribol. Int.
0301-679X,
36
, pp.
459
466
.
5.
Ambekar
,
R.
,
Gupta
,
V.
, and
Bogy
,
D. B.
, 2005, “
Experimental and Numerical Investigation of Dynamic Instability in the Head Disk Interface at Proximity
,”
ASME J. Tribol.
0742-4787,
127
, pp.
530
536
.
6.
Gupta
,
V.
, and
Bogy
,
D. B.
, 2006, “
Effect of Intermolecular Forces on the Static and Dynamic Performance of Air-Bearing Sliders: Part II—Dependence of the Stability on Hamaker Constant, Suspension Preload and Pitch Angle
,”
ASME J. Tribol.
0742-4787,
128
, pp.
203
208
.
7.
Lee
,
S. C.
, and
Polycarpou
,
A. A.
, 2004, “
Strategies to Avoid Head-Disk Instabilities Due to Adhesion in Ultralow Flying Head-Disk Interfaces
,”
IEEE Trans. Magn.
0018-9464,
40
(
4
), pp.
3130
3135
.
8.
Lee
,
S-C.
, and
Polycarpou
,
A. A.
, 2005, “
Microtribodynamics of Pseudo-Contacting Head-Disk Interfaces Intended for 1Tbit∕in2
,”
IEEE Trans. Magn.
0018-9464,
41
(
2
), pp.
812
818
.
9.
Stanly
,
H. M.
,
Etsion
,
I.
, and
Bogy
,
D. B.
, 1990, “
Adhesion of Contacting Rough Surfaces in the Presence of Sub-Boundary Lubrication
,”
ASME J. Tribol.
0742-4787,
112
, pp.
98
104
.
10.
Kogut
,
L.
, and
Etsion
,
I.
, 2004, “
A Static Friction Model for Elastic-Plastic Contacting Rough Surface
,”
ASME J. Tribol.
0742-4787,
126
, pp.
499
506
.
11.
Ono
,
K.
, and
Yamane
,
M.
, 2007, “
Improved Analysis of Unstable Bouncing Vibration and Stabilizing Design of Flying Head Slider in Near-Contact Region
,”
ASME J. Tribol.
0742-4787,
129
, pp.
65
74
.
12.
Ono
,
K.
, and
Oohara
,
S.
, 2005, “
Experimental Identification of Elastic, Damping and Adhesion Forces in Collision of Spherical Sliders with Stationary Magnetic Disk
,”
ASME J. Tribol.
0742-4787,
127
, pp.
365
375
.
13.
Ono
,
K.
, and
Nakagawa
,
K.
, 2006, “
Experimental Study of Collision Motion, Contact Force and Adhesion Force of Hemispherical Sliders With Stationary Magnetic Disks
,”
JSME Int. J., Ser. C
1340-8062,
49
(
4
), pp.
1159
1170
.
14.
Peitgen
,
H. O.
, and
Saupe
,
D.
, 1988,
The Science of Fractal Images
,
Springer-Verlag
,
Berlin
, pp.
21
70
.
15.
Ono
,
K.
,
Takahashi
,
K.
, and
Iida
,
K.
, 1999, “
Computer Analysis of Bouncing Vibration and Tracking Characteristics of a Point Contact Slider Model Over Random Disk Surface
,”
ASME J. Tribol.
0742-4787,
121
, pp.
587
595
.
16.
Ono
,
K.
, and
Iida
,
K.
, 2000, “
Statistical Analysis of Perfect Contact and Wear Durability Conditions of a Single-Degree-of Freedom Contact Slider
,”
ASME J. Tribol.
0742-4787,
122
, pp.
238
245
.
17.
Su
,
L.
,
Xu
,
J.
,
Kurita
,
M.
,
Kato
,
K.
,
Adachi
,
K.
, and
Miyake
,
Y.
, 2005, “
Friction Control of Active-Head Slider During Flying Height Adjustment
,”
ASME J. Tribol.
0742-4787,
127
, pp.
871
877
.
18.
Yamane
,
M.
, and
Ono
,
K.
, 2003, “
Analysis of Tracking Characteristics and Optimum Design of Tri-Pad Slider to Micro-Waviness
,”
ASME J. Tribol.
0742-4787,
125
, pp.
151
161
19.
Iida
,
K.
, and
Ono
,
K.
, 2001, “
Analysis of Bouncing Vibrations of a 2-DOF Model of a Tripad Contact Slider Over a Random Wavy Disk Surface
,”
ASME J. Tribol.
0742-4787,
123
, pp.
159
167
.
You do not currently have access to this content.