Microtribological properties of hard amorphous carbon protective coatings for thin-film magnetic disks and heads

For long durability of magnetic media and head sliders, protective overcoats of hydrogenated amorphous carbon (a-C:H) are generally used. In this study, microtribological studies of hydrogenated amorphous carbon coatings deposited on a single-crystal silicon using three different deposition techniques-sputtering, ion beam and cathodic arc-were studied using atomic force/friction force microscopy (AFM/FFM). Roughnesses of all coatings at two scan sizes of 1 mu mx1 mu m and 10 mu m x 10 mu m are comparable. Surface topography of sputtered carbon coating shows some particulates on the surface. Cathodic are carbon coating exhibits the lowest coefficient of friction value followed by ion beam and sputtered carbon coatings. Microscratch and wear resistance and nanohardness of cathodic are carbon coating are superior to those of ion beam and sputtered carbon coatings. Cathodic are deposited carbon coatings are potential candidates for magnetic disks and heads.