Patent ID: 7791141

Claim:
A resistor comprising a resistance structure comprising: a first electrode; a second electrode, an insulating dielectric transition-metal oxide material deposited over the first electrode such that said insulating dielectric material comprises a concave shape with an edge protruding towards a substrate; wherein said second electrode comprises a protrusion extending into the resistance structure, and wherein said insulating dielectric material comprises an amorphous layer; wherein said second electrode is deposited on the insulating dielectric material in such a way that the insulating dielectric material is at least partially sandwiched between the first electrode and the second electrode and such that the second electrode protrudes with a protrusion into the indentation in the insulating dielectric material towards the first electrode; and a confined conductive region with programmable resistance comprising a conductive filament, formed upon application of a conditioning signal at a predetermined voltage to the protrusion in the insulating dielectric material.