  Zirconia nanotubular layer with an outer tube diameter 25 nm was synthesized
by potentiostatic anodization. The Zr/ZrO2-NT/Au memristive structure is
fabricated using stencil mask and magnetron sputtering techniques.
Current-voltage characteristics are measured in full cycles of resistive
switching with varying parameters of the applied harmonic voltage. An
equivalent circuit with unidirectional electrical conductivity for the studied
structure is proposed. Estimates of the electrical resistance of memristors in
high-and intermediate resistivity states are performed. The high synaptic
plasticity of memristors based on the Zr/ZrO2-NT/Au structure is shown.
