TiO 2 thin films with a thickness of ∼100 nm were prepared on Ti foils by the electrochemical anodization of Ti, and the resistive switching behaviors of Pt/TiO 2 /Ti stacks were investigated. Bipolar switching with opposite polarities (namely "eightwise" and "counter-eightwise") was discovered in the same stack, different from the usual coexistence of unipolar and bipolar switching in TiO 2 films. The intermediate transition process was captured to understand the switching mechanism of the anodic TiO 2 film. An electron/ion co-dominating effect was proposed to explain the anomalous phenomenon.
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Yin et al. (2015) studied this question.
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