Physics – Condensed Matter – Materials Science
Scientific paper
2008-03-14
J. Phys.: Condens. Matter, vol. 19 (2007) 455209 (7pp)
Physics
Condensed Matter
Materials Science
6 pages, 3 figures
Scientific paper
10.1088/0953-8984/19/45/455209
We propose that the driving force of an ultrafast crystalline-to-amorphous transition in phase-change memory alloys are strained bonds existing in the (metastable) crystalline phase. For the prototypical example of GST, we demonstrate that upon breaking of long Ge-Te bond by photoexcitation Ge ion shot from an octahedral crystalline to a tetrahedral amorphous position by the uncompensated force of strained short bonds. Subsequent lattice relaxation stabilizes the tetrahedral surroundings of the Ge atoms and ensures the long-term stability of the optically induced phase.
Fons P.
Kolobov A. V.
Mishchenko Alexander S.
Tominaga Junji
Yakubenya S. M.
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