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Structural transition pathway and bipolar switching of the GeTe-Sb₂Te₃ superlattice as interfacial phase change memory

Abstract

We investigated the resistive switching mechanism between the high-resistance state (HRS) and the low-resistance state (LRS) of the GeTe–Sb2Te3 (GST) superlattice. First-principles calculations were performed to identify the structural transition pathway and to evaluate the current–voltage (I–V) characteristics of the GST device cell. After determining the atomistic structures of the stable structural phases of the GST superlattice, we found the structural transition pathways and the transition states of possible elementary processes in the device, which consisted of a thin film of GST superlattice and semi-infinite electrodes. The calculations of the I–V characteristics were examined to identify the HRS and the LRS, and the results reasonably agreed with those of our previous study (H. Nakamura et al., Nanoscale, 9, 9286 (2017)). The calculated HRS/LRS and analysis of the transition states of the pathways suggest that a bipolar switching mode dominated by the electric-field effect is possible.

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Publication details

The article was received on 11 May 2018, accepted on 17 Jul 2018 and first published on 18 Jul 2018


Article type: Paper
DOI: 10.1039/C8FD00093J
Citation: Faraday Discuss., 2018, Accepted Manuscript
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    Structural transition pathway and bipolar switching of the GeTe-Sb₂Te₃ superlattice as interfacial phase change memory

    N. Inoue and H. Nakamura, Faraday Discuss., 2018, Accepted Manuscript , DOI: 10.1039/C8FD00093J

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