Nikkei Electronics is reporting that Qimonda will be revealing research success with carbon based memory that could scale to 3-4 nanometer dimensions.
Qimonda developed a technology to switch those allotropes by applying an electric current. Specifically, the technology can switch among CNT, conductive carbon such as graphite and insulating carbon like diamond. At this point, the research is in its early stage, but the response speed and the number of times the statuses can be switched are showing a sufficient potential as a next-generation memory
EETimes has some more info