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Current vs voltage characteristics for Fe–O films. The vertical axis on the left is an initial current (: dotted lines) and that on the right is the current for various resistance-changed devices (: solid lines). Example for the resistance change process is shown in the inset.
Examples of time evolution of injected current under a constant voltage stress  for various stress conditions with different polarities. Time-to-resistance change is judged as the change in , respectively.
Time-to-resistance increase as a function of stress voltage for various stress conditions with different polarities (positive stress: open circle, negative stress: closed circle.) The for Fe–O multilayer structure is also shown for comparison. (positive stress: open triangle, negative stress: closed triangle.)
Cumulative probabilities of a critical voltage for the resistance change with different stress polarities.
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