Patent ID: 9680093
Date: 2017-06-13
CPC Classifications: H01L

Claim:
1. A nonvolatile memory element comprising: a first electrode; a second electrode; a variable resistance layer that is between the first electrode and the second electrode and includes, as stacked layers, a first variable resistance layer connected to the first electrode and a second variable resistance layer connected to the second electrode, the variable resistance layer having a resistance value that reversibly changes based on an electrical signal applied between the first electrode and the second electrode; a side wall protecting layer that has oxygen barrier properties and covers at least a side surface of the variable resistance layer and a side surface of the first electrode; and an interlayer insulating layer formed to cover at least the side wall protecting layer, wherein the first variable resistance layer comprises a first transition metal oxide and a third transition metal oxide formed around the first transition metal oxide and having an oxygen deficiency lower than an oxygen deficiency of the first transition metal oxide, and the second variable resistance layer comprises a second transition metal oxide having an oxygen deficiency lower than the oxygen deficiency of the first transition metal oxide, wherein the second variable resistance layer comprises a first side and a second side, wherein the first side of the second variable resistance layer is in physical contact with the second electrode, and wherein the second side of the second variable resistance layer is in physical contact with the first transition metal oxide and the third transition metal oxide.