Data storage medium incorporating a transition metal for increased switching speed
US4710899A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1985 |
| Grant date | Dec 1, 1987 |
| Priority date | — |
| Expiry date | Jun 10, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data storage medium which includes a transition metal as a switching modulator is disclosed. The data storage medium is switchable by projected beam energy, has an erased signal to noise ratio that is substantially invariant with respect to written storage time, and a contrast ratio that is substantially invariant with respect to cycle history. The data storage medium is substantially oxygen free and comprises a chalcogenide and a switching modulator. The switching modulator is a transition metal, especially from the right hand column of Group VIII, e.g. nickel (Ni), palladium (Pd), and platinum (Pt). The concentration of the switching modulator in the data storage medium is high enough to suppress grain growth during written storage, to provide random crystallite orientation and to increase the erase velocity, but low enough to permit discrimination between detectable written and erased states of the data storage medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.