High corrosion-resistant magneto-optical film on a new plastic substrate

To realize high-data-rate and high-reliability magnetooptical (MO) disks, a corrosion-resistant MO film and a novel plastic substrate were developed. Corrosion was reduced by adding a metallic element (M=Ti,Nb,Ta,Cr) to TbFeCo film. The magnetic characteristics of TbFeCoM film were designed to be the same as those of the TbFeCo film. The plastic substrate (photocurable casting resin, PHC) shows low retardation and high heat resistance. MO disks with a trilayer structure on PHC showed high reliability even in severe conditions. The performance of a prototype MO recording system using the PHC disk is presented.>