Time-resolved investigation of nanosecond crystal growth in rapid-phase-change materials: Correlation with the recording speed of digital versatile disc media

Yoshimitsu Fukuyama, Nobuhiro Yasuda, Jungeun Kim, Haruno Murayama, Yoshihito Tanaka, Shigeru Kimura, Kenichi Kato, Shinji Kohara, Yutaka Moritomo, Toshiyuki Matsunaga, Rie Kojima, Noboru Yamada, Hitoshi Tanaka, Takashi Ohshima, Masaki Takata

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The crystallization process in digital versatile disc (DVD) media was investigated using a time-resolved X-ray diffraction apparatus coupled with in situ photoreflectivity measurement. The time profiles of crystallization were found to be consistent with the changes in photoreflectivity. The phase changes were characterized by the start and end time; 90 ±1 and 273 ± 1 ns for Ge2Sb2Te5, and 85 ± 1 and 206 ± 1 ns for Ag3.5In3.5Sb75.0Te 17.7, respectively. The faster crystallization time in Ag 3.5In3.8Sb75.0Te17.7 is ascribed to its characteristic crystallization process; its X-ray diffraction profile shows a significant sharpening during the crystallization process, whereas the peak width of Ge2Sb2Te5 remained unchanged. The present findings suggest that crystal growth control is another key for designing faster phasechange materials.

Original languageEnglish
Pages (from-to)450011-450013
Number of pages3
JournalApplied Physics Express
Volume1
Issue number4
DOIs
Publication statusPublished - 2008 Apr 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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  • Cite this

    Fukuyama, Y., Yasuda, N., Kim, J., Murayama, H., Tanaka, Y., Kimura, S., Kato, K., Kohara, S., Moritomo, Y., Matsunaga, T., Kojima, R., Yamada, N., Tanaka, H., Ohshima, T., & Takata, M. (2008). Time-resolved investigation of nanosecond crystal growth in rapid-phase-change materials: Correlation with the recording speed of digital versatile disc media. Applied Physics Express, 1(4), 450011-450013. https://doi.org/10.1143/APEX.1.045001