Patent ID: 8853663

Claim:
A nonvolatile memory device comprising: first and second electrodes including first and second materials, respectively; a conductive plug under the first and second electrodes, the conductive plug being electrically connected to the first electrode; a bit line above the first and second electrodes, the bit line being electrically connected to the second electrode; a first layer between the first and second electrodes; a second layer between the first layer and the second electrode; an information storage layer between the first and second layer, wherein, the first layer has a positive Peltier coefficient, the second layer has a negative Peltier coefficient, the information storage layer includes (a) resistance change layer that stores information as a changed electrical resistance value, and (b) an ionic source layer on the resistance change layer, the ionic source layer being a source of ions when an electrical potential is applied across the first and second electrodes, the ionic source layer has a first portion and a second portion, the first portion of the ionic source layer is between the resistance change layer and the second layer, with the second electrode being over the second layer, the second portion of the ionic source layer is on the resistance change layer but the second layer and the second electrode are not disposed over the second portion of the ionic source layer, the second portion of the ionic source layer is oxidized while the first portion of the ionic source layer is not oxidized, and the second portion of the ionic source layer is less thick than the first portion of the ionic source layer.