NiO薄膜单极电阻开关中的强电阻非线性和三次谐波
Strong resistance nonlinearity and third harmonic generation in the unipolar resistance switching of NiO thin films
摘要：
我们研究了NiO薄膜中的三次谐波产生，它表现出单极电阻开关行为。我们发现，薄膜的低电阻状态是强烈的非线性，电阻R的变化高达60%。这种强烈的非线性行为很可能是由薄膜内部导电细丝的焦耳热引起的。通过仔细控制外加直流偏压，我们得到了几个低阻态，其三次谐波系数B3f的值与R2+w（w = 2.07）成正比。这表明，NiO膜的电阻变化伴随着导电丝的连接性变化，如在经典的蒸发系统中观察到的。
英文摘要：
We investigated third harmonic generation in NiO thin films, which exhibit unipolar resistance switching behavior. We found that the low resistance states of the films were strongly nonlinear, with variations in the resistance R as large as 60%. This strong nonlinear behavior was most likely caused by Joule heating of conducting filaments inside the films. By carefully controlling the applied dc bias, we obtained several low resistance states, whose values of the third harmonic coefficient B3f were proportional to R2+w (with w = 2.07). This suggested that the resistance changes of the NiO films were accompanied by connectivity changes of the conducting filaments, as observed in classical percolating systems.
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