Patent ID: 8471325

Claim:
A nonvolatile memory device comprising: a substrate; a first electrode extending in a first direction and provided on the substrate; a second electrode extending in a second direction crossing the first direction and provided on the first electrode; a third electrode extending in a third direction crossing the second direction and provided on the second electrode; a first memory portion provided between the first electrode and the second electrode and having a first oxygen composition ratio and a first layer thickness; and a second memory portion provided between the second electrode and the third electrode and having at least one of a second oxygen composition ratio lower than the first oxygen composition ratio and a second layer thickness thicker than the first layer thickness, at least one of the second oxygen composition ratio and the second layer thickness being configured to compensate a difference between an electrical characteristic of the first memory portion and an electrical characteristic of the second memory portion, wherein the second memory portion is stacked on the first memory portion through the second electrode.