抄録
In the latest magnetic storage systems, the spacing between the flying head and the disk has been dramatically decreased to less than 10 nm in order to realize ultra-high density recording. When the flying height is of the same order as the lubricant film thickness, lubricant deformation affects the static and dynamic flying characteristics of the slider. Therefore, it is very important to investigate the deformation and flow characteristics of lubricant on the recording disk. In particular, in heat assisted magnetic recording (HAMR), laser heating of the lubricant changes surface tension distribution, which may cause deformation of the lubricant film. In this paper, we first established temperature and film thickness dependence equation for surface tension. The temperature dependence was obtained by measuring the relation between surface tension and temperature by means of a tensiometer, while film thickness dependence was obtained by theoretical consideration of the van der Waals pressure equation for a multilayer system. By using the steady state long wave equation with consideration to temperature and film thickness dependence of the surface tension, we numerically analyzed the liquid film deformation caused by the temperature distribution. The depression of the liquid was quantitatively obtained.
