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(a) A triangular-waveform voltage signal V(t) with a fixed amplitude of 60 V and period tp . Inset shows a schematic of the Pt/VO2/Al2O3 sample geometry and electrical measurement setup. (b) The resulting current I(t), restricted by the current flow of the load resistor. We defined the switching voltages V ON and V OFF as V(t) at the time when I(t) abruptly increased and decreased, respectively. (c) Procedure for formation of a channel on the surface of the VO2 thin film; the channel has different optical properties than its surroundings.
Dependence of V ON and V OFF on (a) the period of the triangular-waveform voltage signal, tp , (b) the environmental temperature, Te , and (c) the resistance of the load resistor, R load.
Numerical simulation based on the mechanism of thermally induced phase transition. (a) Triangular-waveform voltage signal V(t) and (b) resulting current I(t). Insets show three-dimensional lattice of Pt/VO2/Al2O3 sample and switching rules for the state of the VO2 cell, which we considered for numerical simulation. (c) Procedure for the formation of a metallic channel and Tn -distribution on the surface of the thin film.
Numerical simulation based on the mechanism of thermally induced phase transition. Dependence of V ON and V OFF on (a) tp , (b) Te , and (c) R load.
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