As Kryder and Kim explained, PCRAM is based on the phase change properties of chalcogenide glass. With the application of heat, the glass can switch between two different states (amorphous and crystalline) to be used as a memory. With their small cell size and ability to store multiple bits per cell, PCRAMs have the potential to offer high densities and be cost-competitive with HDDs, but their biggest drawback is that they require somewhat higher power than most other technologies. PCRAMs are already beginning to be marketed by Numonyx Inc., an Intel-ST Microelectronics joint venture, and so are closer to practical realization than STTRAM.Det är mycket intressant läsning och jag tror det blir svårt att knäcka hårddiskarnas dominans under det närmaste deceninet. Framför allt på grund av den utveckling som varit där hårddiskar blir större och dessutom billigare. Svårslagen kombination. I alla fall, mycket läsvärd artikel om framtidens lagringsmedia.
STTRAM, which is similar to magnetic RAM, uses a spin polarized current to write data by reorienting the states of a magnetic tunnel junction between parallel and anti-parallel orientations. In their evaluation, Kryder and Kim found that STTRAMs appear to potentially offer superior power efficiency, among other advantages. If STTRAMs could be improved to store multiple bits per cell, the researchers predict that STTRAMs’ density could make them candidates for replacing flash memory and possibly HDDs.
Källa: Physorg
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