Abstract
Thermal stability of the Al-alloy reflective layer is essential for the archival life of a rewritable phase change optical disk. The new Al–Hf–Pd alloy reflective layer provides excellent thermal stability. A disk using this Al-alloy and a Pd–Ge–Sb–Te alloy recording layer is extremely stable. The bit-error-rate (BER) of the recorded signal did not change substantially after an acceleration test of 6,800 h under the conditions of 90° C, 80%RH. X-ray diffraction analysis showed that the new additive components (Hf, Pd) of the Al-alloy prevented the growth of the Al crystals.
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