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Journal Articles

Pressure-induced site-selective disordering of Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$; A New insight into phase-change optical recording

Kolobov, A.*; Haines, J.*; Pradel, A.*; Ribes, M.*; Fons, P.*; Tominaga, Junji*; Katayama, Yoshinori; Hammounda, T.*; Uruga, Tomoya*

Physical Review Letters, 97(3), p.035701_1 - 035701_4, 2006/07

https://doi.org/10.1103/PhysRevLett.97.035701
 Times Cited Count：93 Percentile：92.27(Physics, Multidisciplinary)

We demonstrate that Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$ (GST), the material of choice in phase-change optical recording (such as DVD-RAM) can be rendered amorphous by the application of hydrostatic pressure. It is argued that this structural change is due to a very strong second-nearest neighbor Te-Te interaction that determines the long-range order in the metastable cubic phase of GST and also to the presence of vacancies. This newly discovered phenomenon suggests that pressure is an important factor for the formation of the amorphous phase which opens new insight into the mechanism of phase-change optical recording.

Journal Articles

High-pressure induced structural changes in metastable Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$ thin films; An X-ray absorption study

Fons, P.*; Kolobov, A.*; Tominaga, Junji*; Katayama, Yoshinori

Nuclear Instruments and Methods in Physics Research B, 238(1-4), p.160 - 162, 2005/08

https://doi.org/10.1016/j.nimb.2005.06.039
 Times Cited Count：5 Percentile：41.08(Instruments & Instrumentation)

Super-resolution (SR) media offer up to a factor of ten increase in areal storage density over conventional DVD media. Although SR has been realized, there is a strong need for a deeper understanding of structural and electronic changes in Ge$$_{2}$$Sb$$_{2}$$Te$$_{5}$$ (GST), a principal optical memory component, with external perturbations. Recording of SR disks leads to the formation of gas-phase bubbles that in turn lead to the development of large stresses on the underlying GST layer. In this paper we report on XAFS of nominally hydrostatic (0-10 GPa) compressive stress-induced structural changes of the metastable crystalline phase of GST. An analysis showed that the initial splitting of Ge Te bond lengths of the room-temperature distorted rocksalt structure decreased to a small but finite splitting for $$p$$ $$_sim^{>}$$ 6 GPa. The implications of this upon the proposed ferroelectric catastrophe super-RENS readout mechanism are discussed.

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