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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Current-induced formation of stable M-2-phase vanadium dioxide
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Current-induced formation of stable M-2-phase vanadium dioxide

机译：电流诱导形成稳定的M-2相二氧化钒

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摘要

Studies are reported on the transformation of M-1-phase vanadium dioxide into the stable M-2 structure for a micro-fabricated device. The device is composed of a VO2 channel of length 50 mu m, width 40 mu m, and thickness 120 nm, and electrical contacts made of titanium and gold. Transformation is achieved in the channel region between electrical contacts by heating the entire structure to 40 degrees C and simultaneously driving current. The channel is observed to partially transform along its length. Micro-Raman measurements reveal the two regions to be the M-1 and M-2-phases of VO2. X-ray photoemission measurements show the presence of gold in both regions, but with higher content in the M-2 material. The M-1 portion of the channel is found to undergo a phase transition to the conductive R phase at similar to 63 degrees C based on resistance and micro-Raman measurements as temperature is increased. The M-2-phase is found to remain stable to temperature cycling between 25 and 120 degrees C. We attribute both the reduced M-1 -> R phase transition temperature and the stable formation of M-2-phase VO2 to the presence of gold.
机译：据报道，有关于将M-1相二氧化钒转变成用于微型设备的稳定M-2结构的研究。该设备由长度为50微米，宽度为40微米，厚度为120纳米的VO2通道以及由钛和金制成的电触点组成。通过将整个结构加热到40摄氏度并同时驱动电流，可以在电触点之间的通道区域实现转换。观察到该通道沿其长度部分变形。显微拉曼测量揭示了这两个区域是VO2的M-1和M-2相。 X射线光发射测量显示两个区域都存在金，但M-2材料中的含量更高。基于电阻和微拉曼测量，随着温度升高，发现通道的M-1部分在类似于63摄氏度的温度下经历到导电R相的相变。发现M-2-相在25至120摄氏度之间的温度循环中保持稳定。我们将M-1-> R相转变温度降低和M-2相VO2的稳定形成归因于金。

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