Title :
A study of the air bearing pressure effect on the lubricant displacement using an optical surface analyzer
Author :
Watanabe, Toshio ; Bogy, David B.
Author_Institution :
Device Technol. Lab., Fuji Electr. Corporate Res. & Dev., Ltd, Nagano, Japan
Abstract :
Summary form only given. Lubricant flow on a hard-disk due to a flying head slider was studied using an optical surface analyzer. A cross section of the lubricant surface under a nano slider is shown. We found that the "lubricant depletion depth" due to air bearing pressure was inversely proportional to the disk rotational speed because of the restoring effect caused by the centrifugal force and air shear force, and with some effect of the surface topography. In addition we analyzed the lubricant thickness modulation in the circumferential direction. It was found that a lubricant pooling area existed on the depletion tracks in some places but no strong natural frequency signal was detected in this case.
Keywords :
disc drives; hard discs; lubrication; magnetic heads; surface topography; air bearing pressure effect; air shear force; centrifugal force; circumferential direction; depletion tracks; disk rotational speed; flying head slider; hard-disk; lubricant depletion depth; lubricant displacement; lubricant flow; lubricant thickness modulation; nano slider; optical surface analyzer; pooling area; restoring effect; surface topography; Degradation; Dip coating; Hydrogen; Lubricants; Monitoring; Optical films; Optical polymers; Polymer films; Pressure effects; Reflectivity;
Conference_Titel :
Magnetics Conference, 2002. INTERMAG Europe 2002. Digest of Technical Papers. 2002 IEEE International
Conference_Location :
Amsterdam, The Netherlands
Print_ISBN :
0-7803-7365-0
DOI :
10.1109/INTMAG.2002.1000859
