Abstract
Magneto-optical disks with diamond-like carbon (DLC) protective coating and perfluoropolyether (PFPE) lubricant film were prepared and their tribological properties were investigated. The tribological evaluation of the disks prepared under various conditions was performed using the drag, contact-start-stop (CSS), and load/unload testing methods. The hardness of the DLC film prepared by sputtering under a bias electric field was about 30 GPa. The experimental results showed that the tribological properties were strongly dependent on the substrate materials, and slightly dependent on the lubricant and DLC film properties. It was found that 5 nm-thick DLC film and 5 nm-thick lubricant film on top of the glass disk showed the best surface durability and head-disk interface (HDI) characteristics.
