Patent ID: 8501621

Claim:
A method of forming the memristive device on the substrate, comprising a first electrode on the substrate; a second electrode, extending over at least a portion of the first electrode, thereby forming a junction region therebetween; an active layer material, established at least over the portion of the first electrode, said portion containing the junction region, a three-dimensionally localized artificial filament extending at least partially between the first electrode and the second electrode, and defined in portion of said material with controlled profile and density of dopants different from the density of dopants in at least some other portion of said material, the method comprising: Establishing the first electrode on at least a portion of the substrate; Establishing the material on the at least the portion of the first electrode; Establishing the second electrode on at least a portion of the material, Establishing a mask layer on the top of at least the portion of the second electrode with at least one opening over the portion of the junction region; Implanting a predetermined doping species into a portion of the material that is unmasked by the mask layer thus forming mobile species, thereby forming an artificial filament; Removing the mask layer; and Annealing the junction region, thereby activating the mobile species.