通过噪声过程探测RuO $_2$纳米线中热激活原子和纳米晶缺陷的运动
Probing Thermally Activated Atomic and Nanocrystalline Defect Motion through Noise Processes in RuO$_2$ Nanowires
摘要：
目前的纳米器件尺寸不断缩小，目的是延长摩尔定律。随着尺寸的不断缩小，不期望的动态缺陷，导致低频噪声和结构不稳定性，在限制小型化器件的最终性能和可靠性方面起着有害的作用。对缺陷动力学的良好理解和有意义的控制则成为根本和紧迫的问题。在这里，我们报告的观察热激活原子缺陷运动以及纳米晶体缺陷运动通过电噪声过程中的金属RuO $_2$金红石纳米线在室温下。首先，我们提取的能量分布函数和移动原子缺陷（氧空位）的数密度。其次，我们得到的几何尺寸，晶界结合强度，和弛豫时间的动态纳米晶体。我们的研究结果清楚地表明，一个强大的探针，有效的和非侵入性的表征纳米结构和纳米材料的机械硬度，击穿电流密度，和/或电阻噪声的定量信息是必不可少的。
英文摘要：
The present-day nanodevice dimensions continuously shrink, with the aim to prolong Moore's law. As downsizing meticulously persists, undesirable dynamic defects, which cause low-frequency noise and structural instability, play detrimental roles on limiting the ultimate performance and reliability of miniaturized devices. A good understanding and a meaningful control of the defect kinetics then become fundamental and urgent issues. Here we report observations of thermally activated atomic defect motion as well as nanocrystalline defect motion through electrical noise processes in metallic RuO$_2$ rutile nanowires around room temperature. First, we extract the energy distribution function and the number density of mobile atomic defects (oxygen vacancies). Second, we obtain the geometrical size, grain-boundary bonding strength, and relaxation times of dynamic nanocrystallites. Our results show clearly a powerful probe for effective and noninvasive characterizations of nanostructures and nanomaterials for which quantitative information about mechanical hardness, breakdown current density, and/or resistance noise is essential.
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