Polymer magneto-optical recorder

Examples of organic-polymer-based reversible media are few. In the inorganic category, reversible phase-change materials and magneto-optic systems appear to be the leading candidates. Both systems can be considered as examples of nondeformation recording. 

Polymers play a vital part in optical recording media, mainly as the substrate material. Polycarbonate is the material of choice for Compact Disc substrates. However, in particular for magneto-optic rewritable disc substrates it could be attractive to reduce the birefringence not only by optimizing the moulding process, but also by modifying the material towards a lower orientational stress optical coefficient. Work at our laboratories has shown that this can be achieved... 

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