Distortion of Local Atomic Structures in Amorphous Ge-Sb-Te Phase Change Materials

A. Hirata*, T. Ichitsubo, P. F. Guan, T. Fujita, M. W. Chen

*この研究の対応する著者

研究成果: Article査読

24 被引用数 (Scopus)

抄録

The local atomic structures of amorphous Ge-Sb-Te phase-change materials have yet to be clarified and the rapid crystal-amorphous phase change resulting in distinct optical contrast is not well understood. We report the direct observation of local atomic structures in amorphous Ge2Sb2Te5 using "local" reverse Monte Carlo modeling dedicated to an angstrom-beam electron diffraction analysis. The results corroborated the existence of local structures with rocksalt crystal-like topology that were greatly distorted compared to the crystal symmetry. This distortion resulted in the breaking of ideal octahedral atomic environments, thereby forming local disordered structures that basically satisfied the overall amorphous structure factor. The crystal-like distorted octahedral structures could be the main building blocks in the formation of the overall amorphous structure of Ge-Sb-Te.

本文言語English
論文番号205502
ジャーナルPhysical Review Letters
120
20
DOI
出版ステータスPublished - 2018 5月 18
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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