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Nonlinear effects in memristors with mobile vacancies
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Because the local concentration of vacancies in any material is bounded, their motion must be accompanied by nonlinear effects. Here we look for such effects in a simple model for electric field driven vacancy motion in memristors, solving the corresponding nonlinear Burgers' equation with impermeable nonlinear boundary conditions analytically. We find non-monotonous relaxation of the resistance while switching between the stable (``on''/``off'') states of the memristor; and qualitatively different film thickness dependencies of switching time (under applied current) and relaxation time (under no current). Our exact solution can serve as a useful benchmark for simulations of more complex memristor models.
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Exact solution for stationary states of a closed memristor with mobile charged vacancies
In a closed memristor model with mobile charged vacancies, the stationary endpoint concentrations and limiting resistances are independent of the vacancy-vacancy electrostatic interaction strength.
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