Bipolar resistive switching (BRS) as well as unipolar resistive switching (URS) behaviors in thick stacks were investigated. Depending on the current compliance during the electroforming process, either BRS or URS was observed. With a lower current compliance during electroforming, asymmetric current-voltage curves showing BRS were observed in the voltage range to , while with a higher current compliance URS behavior was observed. Furthermore, the permanent transition from BRS to URS was investigated by applying a voltage with a higher current compliance .
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Jeong et al. (2007) studied this question.
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