Why Phase-Change Media Are Fast and Stable: A New Approach to an Old Problem
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概要
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Present-day multimedia strongly relies on re-writable phase-change optical memories. We find that, different from current consensus Ge2Sb2Te5 (GST), the material of choice in digital versatile discs—random access memory (DVD-RAM), possesses a structure similar to ferroelectric GeTe, namely that Ge and Sb atoms are located off-center giving rise to a net dipole moment. Amorphisation of both GeTe and GST results in a significant shortening of covalent bonds and a decrease in the mean-square relative displacement concomitant with a drastic change in the short-range order. We demonstrate that the order-disorder transition in GeTe and GST is primarily due to a flip of Ge atoms from an octahedral position into a tetrahedral position without rupture of strong covalent bonds. It is this nature of the transformation that ensures large changes in reflectivity, fast disk performance and repeatable switching over millions cycles.
- 2005-05-15
著者
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Uruga Tomoya
Spring-8 Japan Synchrotron Radiation Research Institute
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Fons Paul
Center For Applied Near-field Optics Research (can-for) Aist
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Tominaga Junji
Center For Applied Near-field Optics Research (can-for) Aist
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ANKUDINOV Alexei
Department of Physics, Box 351560, University of Washington
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YANNOPOULOS Spyros
Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperatur
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ANDRIKOPOULOS Konstantinos
Physics Division, School of Technology, Aristotle University of Thessaloniki
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Frenkel Anatoly
Department Of Physics Yeshiva University
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Kolobov Alexander
Center For Applied Near-field Optics Research (can-for) National Institute Of Advanced Industrial Sc
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Fons Paul
Center for Applied Near-Field Optics Research, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562, Japan
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Kolobov Alexander
Center for Applied Near-Field Optics Research, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562, Japan
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Uruga Tomoya
SPring-8, Japan Synchrotron Radiation Research Institute, Mikazuki, Hyogo 679-5198, Japan
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Tominaga Junji
Center for Applied Near-Field Optics Research, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562, Japan
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Tominaga Junji
Center for Applied Near Field Optics Research (CAN-FOR), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562, Japan
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Ankudinov Alexei
Department of Physics, Box 351560, University of Washington, Seattle, WA 98195, USA
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Andrikopoulos Konstantinos
Physics Division, School of Technology, Aristotle University of Thessaloniki, GR-54124, Thessaloniki, Greece
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Frenkel Anatoly
Department of Physics, Yeshiva University, 245 Lexington Avenue, New York, NY 10016, USA
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Yannopoulos Spyros
Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes, (FORTH-ICE/HT), P.O. Box 1414, 26500 Patras, Greece
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