Conducting Domain Walls in Lithium Niobate Single Crystals
Conducting Domain Walls in Lithium Niobate Single Crystals
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DOI：
10.1002/adfm.201201174
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发表时间：
2012-09-25
影响因子：
19
通讯作者：
Eng, Lukas M.
中科院分区：
文献类型：
--
作者：
Schroeder, Mathias;Haussmann, Alexander;Eng, Lukas M.
铁材料在新型（纳米）电子器件中发挥着越来越重要的作用。近年来，随着BiFeO3和Pb(ZrxTi1-x)O3铁薄膜中畴壁电导率（DWC）的发现，对畴壁（DWs）的研究得到了很大的推动。在这里，证明了DWC不仅限于薄膜，而且同样适用于毫米厚的宽带隙，铁单晶，如LiNbO3。在这种情况下，材料沿DWs的输运可以通过超带隙照明来切换，并通过设计DWs相对于极轴的倾斜角度来调节。使用导电原子力显微镜对DWC和宏观接触进行局部映射，从而研究温度依赖性、DW输运活化能和弛豫行为，得到了一致的结果。
Ferroic materials play an increasingly important role in novel (nano)electronic devices. Recently, research on domain walls (DWs) receives a big boost by the discovery of DW conductivity (DWC) in BiFeO3 and Pb(ZrxTi1-x)O3 ferroic thin films. Here, it is demonstrated that DWC is not restricted to thin films, but equally applies to millimeter-thick wide-bandgap, ferroic single crystals, such as LiNbO3. In this material transport along DWs can be switched by super-bandgap illumination and tuned by engineering the tilting angle of DWs with respect to the polar axis. The results are consistently obtained using conductive atomic force microscopy to locally map the DWC and macroscopic contacts, thereby in addition investigating the temperature dependence, DW transport activation energies, and relaxation behavior.