Mechanical writing of in-plane ferroelectric vortices by tip-force and their coupled chirality
Mechanical writing of in-plane ferroelectric vortices by tip-force and their coupled chirality
复制标题
通过尖端力及其耦合手性对面内铁电涡旋进行机械写入
DOI：
10.1088/1361-648x/ab4831
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发表时间：
2019-10
期刊：
影响因子：
--
通讯作者：
Zheng Yue
中科院分区：
文献类型：
--
作者：
Ma L. L.;Chen W. J.;Wang Biao;Xiong W. M.;Zheng Yue
最近的实验证明了铁电纳米结构中存在涡旋或磁通闭合畴，这对于开发高密度数据存储和新型可配置电子器件具有吸引力。然而，它仍然是具有挑战性的，以稳定在铁电薄膜的横向几何约束的情况下，在平面内的涡旋或磁通闭合域。基于3D相场模型，我们证明了铁电薄膜中孤立或相互作用的面内涡旋的稳定可以通过施加机械尖端力来实现。这种偶极涡的形成是由尖端力引起的去极化效应和面内应变的联合效应引起的。系统地揭示了膜厚、错配应变、针尖力和温度等因素对涡旋形成的影响，并以相图的形式进行了总结。还研究了叶尖诱导涡之间的相互作用。据发现，作为两个提示得到接近比临界距离，两个最初孤立的旋涡成为耦合，具有相同或相反的手征，取决于两个提示之间的距离。铁电薄膜中孤立的面内涡旋的最大数据存储密度估计为~1 Tb in-2。因此，我们的工作演示了一个机械策略，以稳定偶极涡旋，并提供了一个全面的了解铁电薄膜下的机械尖端力的特性。
Recent experiments have demonstrated the existence of vortex or flux-closure domains in ferroelectric nanostructures, which are attractive to develop high-density data storage and novel configurable electronic devices. However, it remains challenging to stabilize in-plane vortex or flux-closure domains in ferroelectric film for the absence of a lateral geometry confinement. Based on a 3D phase field model, here we show that stabilization of isolated or interacting in-plane vortices in ferroelectric film can be achieved via applying a mechanical tip-force. The formation of such dipole vortices is caused by a conjoint effect of the tip-force-induced depolarization effect and in-plane strain. The effects of factors like film thickness, misfit strain, tip force and temperature on the vortex formation are systematically revealed and summarized as phase diagrams. The interaction between tip-induced vortices is also investigated. It is found that as the two tips get closer than the critical distance, the two initially isolated vortices become coupled, with identical or opposite chirality, depending on the distance between the two tips. A maximum data storage density of isolated in-plane vortices in ferroelectric thin film is estimated to be ~1 Tb in−2. Our work thus demonstrates a mechanical strategy to stabilize dipole vortices, and provides a comprehensive insight into the characteristics of ferroelectric film under a mechanical tip force.
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