Micro-tribological properties of heat treated hard disk evaluated by force modulation method

As evaluation of the durability of lubricant and heat cure treated perpendicular hard disks was carried out. With regard to the heat treated perpendicular hard disks, their micro-tribological properties such as hardness, storage modulus, loss modulus, and tan δ have been evaluated by scanning probe microscopy (SPM). In the quasistatic nanoindentation hardness test, it can be observed that nanoindentation hardness in the valleys is higher than that on the hill, and the hardness of the hard disk was increased after it was heat treated. Corresponding to the results of quasistatic nanoindentation in a dynamic nanoindentation test, storage modulus and loss modulus were increased after the heat treatment. Moreover, tan δ also has increased as viewing of viscoelastic properties. On the other hand, for microwear properties, the wear depth of the heat-treated disk and its wear volume were decreased by heat treatment, corresponding to the result of quasistatic nanoindentation.