In an aspect, an apparatus is provided that sets and reprograms the state of programmable devices. In an aspect, the quantity of programmable material is minimized, and the programmable material that is reprogrammed from an amorphous to a crystalline state, and vice versa, is localized on a contact....http://www.google.es/patents/US6747286?utm_source=gb-gplus-sharePatente US6747286 - Pore structure for programmable device
