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Fig. 6 | Nanoscale Research Letters

Fig. 6

From: A Collective Study on Modeling and Simulation of Resistive Random Access Memory

Fig. 6

Dynamical behavior of the tunnel barrier width w. The evolution of the state variable w occurs as a function of time for different applied voltages for a series of a off-switching and c on-switching state tests on the same device. Legends indicate the applied external voltage. The lines are the numerical solution to the respective switching differential equations described in the text. b, d The numerical derivative w˙ of the data in a and c plotted as a function of w for the different applied voltages. The lines are calculated from the differential equations using the measured values of w and i at each point in time. The irregularity of the calculated vs w lines in the on-switching plots is caused by the changes in the current that accompany the change in state ( is a function of two variables, w and i, and both are changing). The derivative of the state variable can be interpreted as the speed of the oxygen vacancy front. This is because the applied voltage pushes it away from or attracts it toward the top electrode [70]

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