Fabrication, micromagnetic and recording properties of CoCrPt on plastic disks

CoCrPt media with 20 nm thickness are fabricated at low temperatures on plastic disks using Cr and SiO2 underlayers and on glass substrates using a Cr underlayer, The fabrication condition is optimized for high coercivity of 2.2 kOe on plastic and 2.4 kOe on glass. The dependence of magnetic properties on Ar pressure and sputtering power of CoCrPt is discussed for the media on plastic disks in comparison with the glass case. The micromagnetic properties such as Barkhausen volume and delta M are discussed. Recording properties of the media on plastic disks deposited under different fabrication conditions are also discussed, and are found to be consistent with micromagnetic properties.