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Decreases in head-disk gap have led to great advances in the magnetic recording technology used for hard disk drives. Because the head-disk gap has reached a few nm or less, head-disk contact can occur. Therefore, lubricant replenishment for depleted areas due to the head contact is a crucial issue in designing head-disk interface (HDI); however, the replenishment mechanism for monolayer or submonolayer...
Monolayer lubricant films applied to head disk interface of hard disk drives consist of bonded and mobile molecules. We measured the diffusion coefficient of mobile molecules which spread through the spaces that were not covered with bonded molecules, and revealed its dependence on the coverage and the conformation of bonded molecules.
Coarse-grained molecular dynamics simulations have been applied to study the effect of polymer functionality on surface morphology of lubricant films. An effective molecular-mesh scanning method was newly introduced to detect the location of film surface. For comparisons, two kinds of double-functional perfluoropolyether (PFPE) Zdol 2000 and Zdol 4000 whose molecular weight was double that of Zdol...
We have developed a method utilizing low-coherence phase-shifting interferometry for directly visualizing molecularly thin lubricant films coated on diamond-like carbon surfaces. By introducing a high-precision feedback controlling phase-shifting system and an image subtraction technique, the method was improved to be capable of providing real-time three-dimensional measurements with a thickness resolution...
In this paper, we report our investigation of the effect of the surface energy profile and the roughness on dewetting by visualizing the dewetting process directly.
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