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Electrical Oscillation in Pt/VO2 Bilayer Strips

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arxiv 1502.00442 v1 pith:SRE332NW submitted 2015-02-02 cond-mat.str-el cond-mat.mtrl-sci

Electrical Oscillation in Pt/VO2 Bilayer Strips

Ying Wang , Jianwei Chai , Shijie Wang , Long Qi , Yumeng Yang , Yanjun Xu , Hidekazu Tanaka , Yihong Wu This is my paper
classification cond-mat.str-el cond-mat.mtrl-sci
keywords oscillationbilayerelectricalheatingoscillatorsoverlayerstripstriggered
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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