Title :
Effect of lubricant thickness and viscosity and rest time on long-term stiction in magnetic thin-film rigid disks
Author :
Zhao, Zheming ; Bhushan, Bharat
Author_Institution :
Dept. of Mech. Eng., Ohio State Univ., Columbus, OH, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
This study makes a first attempt to address long term stiction as a function of lubricant film thickness and its viscosity, and if stiction ever approaches a constant value. Three types of lubricants are chosen in the tests. The equilibrium rest time, defined as the time for static friction force to reach its steady-state value, is reached after the head slider rests on the disk surface for a long enough time. A thicker lubricant film increases the static friction force but shortens the defined equilibrium rest time. Higher viscosity increases the static friction force and equilibrium rest time. Comparison between unlubricated and lubricated disks shows that stiction due to solid-solid asperity contact is negligible. The effect of lubricant viscous flow on the meniscus force at intermediate humidities is discussed
Keywords :
aluminium alloys; friction; hard discs; lubrication; magnesium alloys; magnetic thin film devices; surface tension; surface topography; viscosity; head slider; long-term stiction; lubricant thickness; lubricant viscous flow; magnetic thin-film rigid disks; meniscus force; rest time; solid-solid asperity contact; static friction force; viscosity; Force measurement; Friction; Humidity; Lubricants; Magnetic films; Magnetic heads; Rough surfaces; Surface roughness; Testing; Viscosity;
Journal_Title :
Magnetics, IEEE Transactions on