Pinned interface dipole-induced tunneling electroresistance in ferroelectric tunnel junctions: A theoretical investigation

Pinned interface dipole-induced tunneling electroresistance in ferroelectric tunnel junctions: A theoretical investigation
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铁电隧道结中固定界面偶极子引起的隧道电阻:理论研究

DOI:
10.1063/1.4749267
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发表时间:
2012-09
影响因子:
3.2
通讯作者:
Wu, Y.Z.
Wu, Y.Z.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wu, Y.Z.

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基于密度泛函理论对铁电隧道结(FTJ)结构的预测[Liu et al., Phys.]Rev. B 85, 125407(2012)],我们提供了具有非对称界面(即一个界面偶极子固定而另一个界面偶极子可切换)的FTJ中电子传输的数值模拟。在具有对称电极的ftj中,由于界面偶极子不可切换,会产生隧穿电阻。与可切换界面极化的依赖关系相比,可切换界面极化对固定界面极化的变化不敏感。当钉住极化指向铁电薄膜和低界面介电常数时,可以获得较大的TER。此外,还讨论了电极对结构中TER的影响。
Based on the structure predicted in a ferroelectric tunnel junction (FTJ) in the resent density functional theory study [Liu et al., Phys. Rev. B 85, 125407 (2012)], we provide numerical simulations of the electron transport through the FTJ with asymmetric interfaces, i.e., one interface dipole is pinned and the other interface dipole is switchable. Tunneling electroresistance (TER) can be induced due to the nonswitchable interface dipole in FTJs with symmetric electrodes. Compared with the dependence relationship between TER and the polarization of switchable interface, TER is not sensitive to the variation of the polarization of pinned interface. A large TER can be achieved when the pinned polarization points to the ferroelectric film and low interface dielectric constants. In addition, effect of electrode on TER in the structure is also discussed.
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