Direct observations of recording marks in the phase-change disk

• Project/Area Number: 20760016
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Applied materials science/Crystal engineering
• Research Institution: Osaka University
• Principal Investigator: NAITO Muneyuki Osaka University, 理工学部, 講師 (10397721)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2008: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
• Keywords: 相変化記録 / アモルファス / 透過電子顕微鏡 / 相変化光記録 / ナノビーム電子回折 / 動径分布解析

Research Abstract

Atomistic structures of the Ge_2Sb_2Te_5 thin film in the real phase-change disk have been investigated using transmission electron microscopy (TEM). As-deposited amorphous Ge_2Sb_2Te_5 films were laser-irradiated for initialization (crystallization) and recording. Cross-sectional TEM observations revealed that the recording mark was fully amorphized by laser irradiation. A slight difference between the as-deposited and the laser-irradiation-induced amorphous Ge_2Sb_2Te_5 was observed in the intensity profile of nano-beam electron diffraction patterns and atomic pair distribution functions. This difference was attributed to structural relaxation of amorphous Ge_2Sb_2Te_5, which gives rise to the alteration of chemical order.

Research Products

• [Journal Article] Direct observations of Ge2Sb2Te5 recording marks in the phase-change disk (2010)
  • Author(s): Muneyuki Naito, Manabu Ishimaru, Yoshihiko Hirotsu, Rie Kojima, Noboru Yamada
  • Journal Title: J. Appl. Phys. Vol.107
  • Peer Reviewed
• [Journal Article] Direct observations of Ge_2Sb_2Te_5 recording marks in the phase-change disk (2010)
  • Author(s): 内藤宗幸
  • Journal Title: Journal of Applied Physics 107(印刷中)
  • Peer Reviewed
• [Presentation] 相変化光ディスクにおける記録マーク部の直接観察 (2008)
  • Author(s): 内藤宗幸
  • Organizer: 顕微鏡学会
  • Place of Presentation: 国立京都国際会館
  • Year and Date: 2008-05-21
• [Presentation] 相変化光ディスクにおける記録マーク部の直接観察 (2008)
  • Author(s): 内藤宗幸
  • Organizer: 日本顕微鏡学会
  • Place of Presentation: 国立京都国際会館
  • Year and Date: 2008-05-21