scholarly journals A Dynamic Model of the Magnetic Head Slider With Contact and Off-Track Motion due to a Thermally Actuated Protrusion or a Moving Bump Involving Intermolecular Forces

2016 ◽  
Author(s):  
Saurabh Pathak ◽  
Shao Wang
Keyword(s):  
Dynamic Model ◽  
Rotating Disk ◽  
Disk Surface ◽  
Intermolecular Forces ◽  
Flying Height ◽  
Magnetic Head ◽  
Computationally Efficient ◽  
Normal Contact ◽  
Head Slider ◽  
Thermally Actuated

A computationally efficient five-degree-of-freedom dynamic model was developed to simulate the motion of a magnetic head slider under the conditions of moving-bump collision and of contact due to an expanding protrusion on the slider for thermal flying-height control, with consideration of intermolecular forces. Compared to results obtained without intermolecular forces for a bump on the rotating disk, the intermolecular forces cause a significantly greater normal contact force, a larger roll angle and a larger off-track displacement under nonzero skew. When an expanding protrusion on the slider reaches a position close to the disk surface, the intermolecular forces pull the slider into contact at an earlier time and keep the protrusion in contact for a longer duration, which, with friction under nonzero skew, results in a substantially greater off-track displacement.

Dynamic Flying Characteristics of Magnetic Head Slider With Dust

1994 ◽  
Vol 116 (1) ◽  
pp. 95-100 ◽  
Author(s):  
Mikio Tokuyama ◽  
Shinichi Hirose
Keyword(s):  
Disk Surface ◽  
Numerical Results ◽  
Flying Height ◽  
Magnetic Head ◽  
Head Slider ◽  
Air Lubrication

The dust adhering to the taper of a slider changes the shape of its flying rail and decreases the efficiency of air lubrication that determines its flying height. The dynamic flying height characteristics of the slider with dust at its taper are numerically and experimentally examined. The numerical results show that a triangular accumulation of dust at the tapered portion of the slider degrades the motion-following performance of the slider as it covers the runout of the magnitude disk surface. A dust adhesion experiment revealed that dust at the tapered portion decreased the flying height and increased flying height fluctuations. The disk runout is considered a major reason for the fluctuation increase.

Air flow around a magnetic-head-slider suspension and its effect on slider flying-height fluctuation

1990 ◽  
Vol 26 (5) ◽  
pp. 2430-2432 ◽  
Author(s):  
Y. Yamaguchi ◽  
A. Ahasan Talukder ◽  
T. Shibuya ◽  
M. Tokuyama
Keyword(s):  
Air Flow ◽  
Flying Height ◽  
Magnetic Head ◽  
Head Slider

Air flow around magnetic-head-slider suspension and its effect on slider flying-height fluctuation

1990 ◽  
Author(s):  
Y. Yamaguchi ◽  
A.A. Talukder ◽  
T. Shibuya ◽  
M. Tokuyama
Keyword(s):  
Air Flow ◽  
Flying Height ◽  
Magnetic Head ◽  
Head Slider

scholarly journals Active Flying-height Control of Magnetic Head Slider using MEMS Thermal Actuator

2006 ◽  
Vol 72 (713) ◽  
pp. 267-273
Author(s):  
Masayuki KURITA ◽  
Toshiya SHIRAMATSU ◽  
Kouji MIYAKE ◽  
Atsushi KATO ◽  
Masahiko SOGA ◽  
...  
Keyword(s):  
Thermal Actuator ◽  
Flying Height ◽  
Magnetic Head ◽  
Height Control ◽  
Head Slider

Examination of flying height of magnetic head slider in simulations and measurements at nanometer-order spacing

2005 ◽  
Vol 11 (8-10) ◽  
pp. 914-920
Author(s):  
Yoshinori Takeuchi ◽  
Katsuyuki Tanaka ◽  
Toshiko Odaka ◽  
Fumitaka Muranushi
Keyword(s):  
Flying Height ◽  
Magnetic Head ◽  
Head Slider

Experimental and Theoretical Investigation of Bouncing Vibrations of a Flying Head Slider in the Near-Contact Region

2006 ◽  
Vol 129 (2) ◽  
pp. 246-255 ◽  
Author(s):  
Kyosuke Ono ◽  
Masami Yamane
Keyword(s):  
Vibration Amplitude ◽  
Contact Region ◽  
Ambient Pressure ◽  
Disk Surface ◽  
Flying Height ◽  
Trailing Edge ◽  
Detailed Measurement ◽  
Head Slider ◽  
Pitch Frequency ◽  
Two Degree Of Freedom

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.

Flying-height reduction of magnetic-head slider due to thermal protrusion

2005 ◽  
Vol 41 (10) ◽  
pp. 3007-3009 ◽  
Author(s):  
M. Kurita ◽  
Junguo Xu ◽  
M. Tokuyama ◽  
K. Nakamoto ◽  
S. Saegusa ◽  
...  
Keyword(s):  
Flying Height ◽  
Magnetic Head ◽  
Head Slider ◽  
Height Reduction ◽  
Thermal Protrusion
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