Patent ID: 7820996

Claim:
A nonvolatile memory device comprising: a switching element; and a data storage part electrically connected to the switching element, the data storage part comprising: a lower electrode connected to the switching element; an insulating layer on the lower electrode of a predetermined thickness, the insulating layer comprising a contact hole exposing the lower electrode; a data storage layer completely filling the contact hole, the data storage layer comprising a transition metal oxide, wherein a resistance state of the data storage layer is switchable between a high resistance state and a low resistance state in response to voltages in different voltage ranges, the voltages and the different voltage ranges having the same polarity; and an upper electrode on the insulating layer and the data storage layer, wherein widths of the lower and upper electrodes are larger than a width of the data storage layer, and a height of the data storage layer is larger than the width of the data storage layer; wherein the contact hole passes through the insulating layer.