Patent ID: 8629034

Claim:
A method for producing a nonvolatile memory element, comprising: providing a carrier material; forming an auxiliary layer; forming a depression in the auxiliary layer; filling the depression with a first electrically conductive material to form a first electrode; forming at least one field amplification structure at the first electrode, wherein the formation of the at least one field amplification structure comprises: removing at least a predetermined amount of the first electrically conductive material in the depression by etching; forming a conformal electrically conductive layer in such a way that an adapted depression remains in a region of the depression; etching the electrically conductive layer back to at least as far as a level of a surface of the auxiliary layer by anisotropic etching; and etching the auxiliary layer back to essentially as far as a level of a bottom of the adapted depression by anisotropic etching; forming a conductivity state changeover material layer on the first electrode with the at least one field amplifier structure in such a way that a further adapted depression remains in the region of the depression, after which at least two different conductivity states prevailing in the conductivity state changeover material, between which changeover can be repeatedly effected by an application of predetermined programming voltages; and forming a second electrically conductive electrode on the changeover material layer.