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(a) Current vs switching cycles for the metal--metal heterostructures. Inset shows a schematic view of the heterostructures and the direction of the applied current and pulse voltage. (b) The resistance changing ratio vs the switching cycles for the heterostructures, where represents the initial resistance value and denotes the changed resistance value.
characteristics of the heterostructures at . Arrows indicate the sweeping directions.
characteristics of the heterostructures at in a double-logarithmic plot: (a) positive-bias and (b) negative-bias regions. Note that the absolute values of current and voltage are taken for the both ordinates. Arrows indicate the sweeping directions.
(Color online) Multicycles characteristics of the heterostructures for 10, 500, and at . Arrows indicate the sweeping directions. Inset shows that the retention behavior of the heterostructures.
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