Formation and tribology properties of polyfluoroalkylmethacrylate film on the magnetic head surface

A polyfiuoroalkylmethacrylate （PFAM） film has been coated on the surface of the magnetic head by a dipping coating method to modify the surface properties. The films were characterized by means of a time-of-flight secondary ion mass spectrometer （TOF-SIMS）, contact angle measurement and atomic force microscopy （AFM）. The results indicate that the concentration of the solution is the main factor affecting the thickness, contact angle and surface topography of the film. The magnetic head with the PFAM film at a concentration of 500 ppm exhibits the best tribology properties, and the stiction between the magnetic head and the disk is no more than 2.4 g after 20000 contact start stop （CSS） cycles. Therefore, a fully covered PFAM film with few defects helps improve the tribology properties of the magnetic head, and decrease the adsorbed contaminant on the magnetic head surface.