Phase-change media for high-numerical-aperture and blue-wavelength recording

Herman J. Borg, Mark Van Schijndel, Jan C.N. Rijpers, Martijn H.R. Lankhorst, Guofu Zhou, Martijn J. Dekker, Igolt P.D. Ubbens, Maarten Kuijper

Research output: Contribution to journalArticleAcademicpeer-review

99 Citations (Scopus)

Abstract

We have studied the feasibility of doped eutectic SbTe alloys for practical application in digital video recording (DVR) rewritable phase-change media for high-numerical-aperture (NA = 0.85) and blue-wavelength (λ = 405 nm) recording. Remaining issues such as thermal cross-erase in land/groove recording and the thermal stability of recorded amorphous marks have been investigated and resolved. This work has resulted in the realisation of 22.5 GB phase-change media complying with the DVR blue format. The future of doped eutectic SbTe alloys in the phase-change recording-speed race is also promising, as the crystallisation speed and archival life stability can be optimised more or less independently by tuning the Sb/Te atomic ratio and adding Ge, respectively. We have demonstrated that a user data transfer rate of 70 Mbit/s (DVR double speed) is within reach using our current phase-change composition, and are expecting to realise data rates of over 100 Mbit/s in the near future.

Original languageEnglish
Pages (from-to)1592-1597
Number of pages6
JournalJapanese Journal of Applied Physics, Part 2 : Letters
Volume40
Issue number3 B
Publication statusPublished - 1 Dec 2001
Externally publishedYes

Keywords

  • Archival life stability
  • Blue laser diode
  • Cosputtering
  • Crystallisation kinetics
  • Doped eutectic SbTe
  • DVR
  • High NA
  • High-speed recording
  • Optical disc recording
  • Phase-change recording media
  • Stoichiometric GeSbTe

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