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(Color online) Sketch of the MFM junction with two ferroelectric dead layers, σ s and σ′ s stand for the screening charges in the left and right electrodes, respectively.
(Color online) TER ratio, , as a function of FE barrier thickness for different directions of the interface dipoles, the sign “+”(“−”) stands for the interface dipoles pointing to the right (left) direction. The inset shows the corresponding local potential energy profile for d f = 2 nm. The arrows in the insert denote the direction of P f .
(Color online) TER ratio varies with the left interface polarization P iL . P iR is fixed as |P iR | = 0.13 C/m2, and the barrier thickness is selected as d f = 2 nm. The sign “+” and “−” denote the direction of interface dipoles dot line is added for comparison, which is the TER of the FTJ without dead layers.
(Color online) TER as a function of (a) the dielectric constant of the left interface and (b) the dielectric constant of the right interface, and screening charge density as a function of (c) the dielectric constant of the left interface and (d) the dielectric constant of the right interface. Dash lines denote P iL = −P iR = 0.13 C/m2, which is smaller than the magnitude of P f , and solid lines stand for P iL = −P iR = 0.4 C/m2, which is larger than the magnitude of P f . Dot line indicates the TER without consideration of dead layers. The insets in (c) and (d) represent the derivatives of σ s with ε iL and ε iR for P f pointing to the right.
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