PRODUCTION OF MAGNETIC RECORDING MEDIUM

摘要

PURPOSE:To improve the weather resistance and durability by forming a ferromagnetic thin film on a moving nonmagnetic substrate by continuous diagonal vapor deposition and by exposing the surface of the ferromagnetic thin film to an atmosphere contg. steam under a specified partial pressure while moving the substrate. CONSTITUTION:The ferromagnetic thin film is formed on the moving nonmagnetic substrate by the continuous diagonal vapor deposition, and the surface of the ferromagnetic thin film is exposed to an atmosphere contg. steam under 100-475Torr partial pressure while the substrate is moved. Co or an alloy contg. >=70wt% Co is preferably used as a magnetic metallic material to be vapor-deposited. The plastic base of polyethylene terephthalate or polyimide is preferably used as the substrate.