As the flying height decreases to achieve greater areal density in hard disk drives, different proximity forces act on the air bearing slider, which results in fly height modulation and instability. Identifying and characterizing these forces has become important for achieving a stable fly height at proximity. One way to study these forces is by examining the fly height hysteresis, which is a result of many constituent phenomena. The difference in the touchdown and takeoff rpm (hysteresis) was monitored for different slider designs, varying the humidity and lubricant thickness of the disks, and the sliders were monitored for lubricant pickup while the disks were examined for lubricant depletion and modulation. Correlation was established between the observed hysteresis and different possible constituent phenomena. One such phenomenon was identified as the Intermolecular Force from the correlation between the lubricant thickness and the touchdown velocity. Simulations using 3D dynamic simulation software explain the experimental trends.
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e-mail: rohit@cml.berkeley.edu
e-mail: vineet@cml.berkeley.edu
e-mail: dbogy@cml.berkeley.edu
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July 2005
Research Papers
Experimental and Numerical Investigation of Dynamic Instability in the Head Disk Interface at Proximity
Rohit Ambekar,
Rohit Ambekar
Graduate Student
Department of Mechanical Engineering,
e-mail: rohit@cml.berkeley.edu
University of California
, Berkeley, CA 94704
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Vineet Gupta,
Vineet Gupta
Graduate Student
Department of Mechanical Engineering,
e-mail: vineet@cml.berkeley.edu
University of California
, Berkeley, CA 94704
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David B. Bogy
David B. Bogy
William S. Floyd, Jr. Distinguished Professor in Engineering
Department of Mechanical Engineering,
e-mail: dbogy@cml.berkeley.edu
University of California
, Berkeley, CA 94704
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Rohit Ambekar
Graduate Student
Department of Mechanical Engineering,
University of California
, Berkeley, CA 94704e-mail: rohit@cml.berkeley.edu
Vineet Gupta
Graduate Student
Department of Mechanical Engineering,
University of California
, Berkeley, CA 94704e-mail: vineet@cml.berkeley.edu
David B. Bogy
William S. Floyd, Jr. Distinguished Professor in Engineering
Department of Mechanical Engineering,
University of California
, Berkeley, CA 94704e-mail: dbogy@cml.berkeley.edu
J. Tribol. Jul 2005, 127(3): 530-536 (7 pages)
Published Online: March 23, 2005
Article history
Received:
March 1, 2004
Revised:
March 23, 2005
Citation
Ambekar, R., Gupta, V., and Bogy, D. B. (March 23, 2005). "Experimental and Numerical Investigation of Dynamic Instability in the Head Disk Interface at Proximity." ASME. J. Tribol. July 2005; 127(3): 530–536. https://doi.org/10.1115/1.1924429
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