Gong Feng-Hui, Tang Yun-Long, Zhu Yin-Lian, Zhang Heng, Wang Yu-Jia, Chen Yu-Ting, Feng Yan-Peng, Zou Min-Jie, Wu Bo, Geng Wan-Rong, Cao Yi, Ma Xiu-Liang
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang 110016, China.
School of Materials Science and Engineering, University of Science and Technology of China, Wenhua Road 72, Shenyang 110016, China.
Sci Adv. 2021 Jul 9;7(28). doi: 10.1126/sciadv.abg5503. Print 2021 Jul.
A dipole wave is composed of head-to-tail connected electric dipoles in the form of sine function. Potential applications in information carrying, transporting, and processing are expected, and logic circuits based on nonlinear wave interaction are promising for dipole waves. Although similar spin waves are well known in ferromagnetic materials for their roles in some physical essence, electric dipole wave behavior and even its existence in ferroelectric materials are still elusive. Here, we observe the atomic morphology of large-scale dipole waves in PbTiO/SrTiO superlattice mediated by tensile epitaxial strains on scandate substrates. The dipole waves can be expressed in the formula of = sin (2π/) + , where the wave amplitude () and wavelength () correspond to 1.5 and 6.6 nm, respectively. This study suggests that by engineering strain at the nanoscale, it should be possible to fabricate unknown polar textures, which could facilitate the development of nanoscale ferroelectric devices.
偶极波由呈正弦函数形式首尾相连的电偶极子组成。预计其在信息承载、传输和处理方面具有潜在应用，基于非线性波相互作用的逻辑电路对偶极波很有前景。尽管类似的自旋波在铁磁材料中因其在某些物理本质中的作用而广为人知，但电偶极波的行为乃至其在铁电材料中的存在仍然难以捉摸。在此，我们观察到在钪酸盐衬底上由拉伸外延应变介导的PbTiO/SrTiO超晶格中大规模偶极波的原子形态。偶极波可用公式 = sin (2π/) + 表示，其中波幅（）和波长（）分别对应1.5纳米和6.6纳米。这项研究表明，通过在纳米尺度上设计应变，应该有可能制造出未知的极性纹理，这可能有助于纳米级铁电器件的发展。
