Cand. Sci. (Phys.-Math.), Assoc. Prof., Senior Scientific Researcher of the Laboratory of Diffusion Processes, S. P. Kapitsa Scientific Research Institute, Ulyanovsk State University (Russia, 432700, Ulyanovsk, Leo Tolstoy st., 42); Senior Scientific Researcher of the Research Laboratory of Memristive Systems Based on Self-Organized Structures, SMC “Technological Center” (Russia, 124498, Moscow, Zelenograd, Shokin sq., 1, bld. 7)