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 language | English |
|---|---|
| Pages (from-to) | 1592-1597 |
| Number of pages | 6 |
| Journal | Japanese Journal of Applied Physics, Part 2 : Letters |
| Volume | 40 |
| Issue number | 3 B |
| Publication status | Published - 1 Dec 2001 |
| Externally published | Yes |
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