Charged Ferroelectric Domain Walls for Deterministic ac Signal Control at the Nanoscale.
Charged Ferroelectric Domain Walls for Deterministic ac Signal Control at the Nanoscale.
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DOI：
10.1021/acs.nanolett.1c03182
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发表时间：
2021-11-24
期刊：
影响因子：
10.8
通讯作者：
Meier D
中科院分区：
文献类型：
--
作者：
Schultheiß J;Lysne E;Puntigam L;Schaab J;Bourret E;Yan Z;Krohns S;Meier D
铁电畴壁的直流电导率和涌现功能与局部极化电荷密切相关。根据电荷状态，壁可以表现出不寻常的直流导电，从绝缘到金属状，这在基于畴壁的存储器，多级数据存储和突触器件中得到了利用。与带电壁的功能性直流行为相反，它们对交流电（ac）的响应仍有待解决。在这里，我们揭示了交流特性在正电荷和负电荷的墙在ErMnO 3，明显不同于周围的域的响应。通过结合宏观和局部尺度上的电压依赖性光谱测量，我们证明了一个明显的非线性响应在电极壁结，这与畴壁电荷状态。对交流驱动电压的依赖性使得能够在单极性和双极性输出信号之间进行可逆切换，为带电壁作为交流电路中的功能纳米元件的应用提供了概念上的新机会。
The direct current (dc) conductivity and emergent functionalities at ferroelectric domain walls are closely linked to the local polarization charges. Depending on the charge state, the walls can exhibit unusual dc conduction ranging from insulating to metallic-like, which is leveraged in domain-wall-based memory, multilevel data storage, and synaptic devices. In contrast to the functional dc behaviors at charged walls, their response to alternating currents (ac) remains to be resolved. Here, we reveal ac characteristics at positively and negatively charged walls in ErMnO3, distinctly different from the response of the surrounding domains. By combining voltage-dependent spectroscopic measurements on macroscopic and local scales, we demonstrate a pronounced nonlinear response at the electrode-wall junction, which correlates with the domain-wall charge state. The dependence on the ac drive voltage enables reversible switching between uni- and bipolar output signals, providing conceptually new opportunities for the application of charged walls as functional nanoelements in ac circuitry.
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