SELF-EPITAXIAL CO-CR MEDIA - PREFERABLE FOR FABRICATION BY ROLL COATER SPUTTERING SYSTEM

A roll coater system was investigated for establishment of a mass production system for Co-Cr perpendicular magnetic recording media. Improvements of the crystal orientation and the magnetic properties of Co-Cr films with new seed layers of Co-Cr iself are first described. In the light of these results, a Co-Cr film with a composition gradient in the growing direction but without any seed layer is proposed and its properties are discussed. It is found that the anisotropy field H//k can be remarkably increased for the film with a composition gradient over that of films with uniform composition.