Abstract
Blow-off experiments were conducted for functional PFPE Zdol 3000 and nonfunctional PFPE Z25. Theory predicting the film thickness in blow-off was established. Micro slip of the lubricant film at the hard disk surface was observed for nonfunctional Z25, but not for functional Zdol 3000. It is found, by comparing the experimental results with the theoretical prediction, that micro slip velocity was the highest at the front edge of Z25 film, and it decreased rapidly as the distance from the front edge increased. Accumulation of Z25 lubricant film at the front edge occurred due to the high micro slip velocity at the place. The accumulated upper film had a lower viscosity than the lower layer film.
