Abstract
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 Ge2Sb2Te5 (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 ≳ 6 GPa. The implications of this upon the proposed ferroelectric catastrophe super-RENS readout mechanism are discussed.
Original language | English |
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Pages (from-to) | 160-162 |
Number of pages | 3 |
Journal | Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms |
Volume | 238 |
Issue number | 1-4 |
DOIs | |
Publication status | Published - 2005 Aug |
Externally published | Yes |
Event | Synchrotron Radiation in Materials Science Proceedings of the 4th Conference on Synchrotron Radiation in Materials Science - Duration: 2004 Aug 23 → 2004 Aug 25 |
Keywords
- Ge-Sb-Te
- High-pressure
- Optical memory
- Structure
- XAFS
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Instrumentation