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Current-voltage characteristics demonstrating unipolar switching in TiN/HfO2-Fe2O3/Ti devices containing (a) periodically laminated media grown using relatively large amounts of HfO2 deposition cycles, (b) periodically laminated media grown using the same cycle numbers for HfO2 and Fe2O3, and (c) three-layer stack with Fe2O3 layer grown in between HfO2 films. The deposition cycle sequences are indicated by labels.
