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Electrical Oscillation in Pt/VO2 Bilayer Strips

We report on the observation of stable electrical oscillation in Pt/VO2 bilayer strips, in which the Pt overlayer serves the dual purposes of heating up the VO2 and weakening the electric field in the VO2 layer. Systematic measurements in an ultrahigh vacuum nanoprobe system show that the oscillation frequency increases with the bias current and/or with decreasing device dimension. In contrast to most VO2-based oscillators reported to date, which are electrically triggered, current-induced Joule heating in the Pt overlayer is found to play a dominant role in the generation of oscillation in Pt/VO2 bilayers. A simple model involving thermally triggered transition of VO2 on a heat sink is able to account for the experimental observations. The results in this work provide an alternative view of the triggering mechanism in VO2-based oscillators.

preprint2015arXivOpen access
Ying WangJianwei ChaiShijie WangLong QiYumeng YangYanjun XuHidekazu TanakaYihong Wu
cond-mat.str-elcond-mat.mtrl-sci
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Ying WangJianwei ChaiShijie WangLong QiYumeng YangYanjun XuHidekazu TanakaYihong Wu

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