Comparison of TER Ratios: The TER ratio of FTJs with MFIM and MFIS structures is compared in Fig. 6. Different pulse conditions were applied for the two structures, with ±6 V/500 ns for MFIM and ±10 V/500 ns for MFIS. The passage notes that the MFIS structure had a larger TER ratio than MFIM after the application of the potentiation pulse. This difference is attributed to the asymmetry of the charge screening property of the bottom electrodes in the two structures.