Abstract
Superlattice-like phase change optical disks, where the recording layer consists of alternating thin layers with two different phase change materials of GeTe and Sb 2 Te 3 , have been fabricated. The optical and thermal properties were simulated and measured. Samples were measured by X-ray diffraction (XRD) after annealing. The peaks of Ge 2 Sb 2 Te 5 were observed, which indicates that Ge 2 Sb 2 Te 5 was formed at the interface between GeTe and Sb 2 Te 3 . The recording, erasing and overwriting properties were investigated. The signal differentiation in writing, reading and erasing was observed at the pulse width of 7 ns, which indicates that the superlattice-like structure can effectively shorten the crystallization time. The overwriting cycle was measured using a static tester. Within 10000 times no significant change in the modulation amplitude was observed.