Categorization of resistive switching of metal-Pr0.7Ca0.3MnO3-metal devices
Categorization of resistive switching of metal-Pr0.7Ca0.3MnO3-metal devices
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DOI：
10.1063/1.3159471
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发表时间：
2009-06-22
影响因子：
4
通讯作者：
Chen, D. M.
中科院分区：
文献类型：
--
作者：
Liao, Z. L.;Wang, Z. Z.;Chen, D. M.
夹在 Pt 底部电极和由各种金属制成的顶部电极 (TE) 之间的 Pr0.7Ca0.3MnO3 (PCMO) 薄膜的电阻开关 (RS) 特性被发现属于两类。具有由 Al、Ti 和 Ta 制成的 TE 的器件表现出较大的 I-V 磁滞回线和双极 RS，但具有由 Pt、Ag、Au 和 Cu 制成的 TE 的器件却没有。透射电子显微镜显示，前一组TE和PCMO之间的界面处形成了薄金属氧化物层，但后一组TE没有形成。分析表明，分类取决于 TE 相对于 PCMO 的吉布斯氧化自由能。
Resistive switching (RS) characteristics of a Pr0.7Ca0.3MnO3 (PCMO) film sandwiched between a Pt bottom electrode and top electrodes (TE) made of various metals are found to belong to two categories. Devices with TE made of Al, Ti, and Ta exhibit a large I-V hysteresis loop and bipolar RS, but those with TE made of Pt, Ag, Au, and Cu do not. Transmission electron microscopy reveals that a thin metal-oxide layer formed at the interface between the former group of TE and PCMO, but not for the latter group of TE. Analysis shows that the categorization depends on the Gibbs free energy of oxidation of the TEs with respect to that of PCMO.