Molecular Dynamics Study of Temperature Effect on Shear Property of Nanometer-Thick Liquid Lubricant Films

Abstract

To design head disk interface of hard disk drives (HDDs) using heat assisted magnetic recording, it is important to reveal temperature effects on shear properties of nanometer-thick liquid lubricant films. For this purpose, we conducted molecular dynamics simulations of a liquid film of perfluoropolyether which is subjected to confined shear between two carbon plates under conditions of different temperatures and shear speeds. The results of the simulations indicate that the rate of change of shear viscosity with temperature becomes smaller with increasing shear rate and the temperature dependence of shear viscosity is almost negligible under the condition of high shear rates which are typical for HDDs.