Abstract
In the head-disk interface (HDI) of a hard disk drive (HDD), lubricant deformation may effect on flying characteristics of the head slider, as the flying height decreases. To examine behaviors and instabilities of ultra-thin but continuum polar liquid films, the long wave theory was employed, which is the time-evolution for the shape of thin liquid film and includes surface tensions and surface forces such as the van der Waals forces (or disjoining pressure). The polar lubricant was found to be dynamically unstable due to the attractive or repulsive force of the polar component. Stability/instability and time-evolution of the polar liquid surfaces were numerically analyzed and the steady-state liquid film configurations were quantitatively obtained.
