TY - JOUR
T1 - High-pressure induced structural changes in metastable Ge 2Sb2Te5 thin films
T2 - Synchrotron Radiation in Materials Science Proceedings of the 4th Conference on Synchrotron Radiation in Materials Science
AU - Fons, P.
AU - Kolobov, A. V.
AU - Tominaga, J.
AU - Katayama, Y.
PY - 2005/8
Y1 - 2005/8
N2 - 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.
AB - 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.
KW - Ge-Sb-Te
KW - High-pressure
KW - Optical memory
KW - Structure
KW - XAFS
UR - http://www.scopus.com/inward/record.url?scp=25144465003&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=25144465003&partnerID=8YFLogxK
U2 - 10.1016/j.nimb.2005.06.039
DO - 10.1016/j.nimb.2005.06.039
M3 - Conference article
AN - SCOPUS:25144465003
SN - 0168-583X
VL - 238
SP - 160
EP - 162
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 1-4
Y2 - 23 August 2004 through 25 August 2004
ER -