An integrated circuit includes a first electrode and a first resistivity changing material coupled to the first electrode. The first resistivity changing material has a planarized surface. The integrated circuit includes a second resistivity changing material contacting the planarized surface of the...http://www.google.de/patents/US7812333?utm_source=gb-gplus-sharePatent US7812333 - Integrated circuit including resistivity changing material having a planarized surface
