Why phase-change media are fast and stable: A new approach to an old problem

Alexander V. Kolobov, Paul Fons, Junji Tominaga, Anatoly I. Frenkel, Alexei L. Ankuoinov, Spyros N. Yannopoulos, Konstantinos S. Andrikopoulos, Tomoya Uruga

研究成果: Article査読

61 被引用数 (Scopus)


Present-day multimedia strongly relies on re-writable phase-change optical memories. We find that, different from current consensus Ge2Sb 2Te5 (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.

ジャーナルJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
5 B
出版ステータスPublished - 2005 5

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)


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