**5. Acknowledgment**

This work was financially supported in part by the European Commission in the projects GOSSAMER and PULLNANO, and by the Federal Ministry of Education and Research of the Federal Republic of Germany (project nos. 01M3167 A and 01M3171 A).

The authors would like to express their gratitude to the whole flash development team of the former company Qimonda, especially Tim Höhr for the capacitance simulations.
