Yin Jie, Zong Hongxiang, Tao Hong, Tao Xuefei, Wu Haijun, Zhang Yang, Zhao Li-Dong, Ding Xiangdong, Sun Jun, Zhu Jianguo, Wu Jiagang, Pennycook Stephen J
Department of Materials Science, Sichuan University, Chengdu, China.
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China.
Nat Commun. 2021 Jun 15;12(1):3632. doi: 10.1038/s41467-021-23863-w.
Multitudinous topological configurations spawn oases of many physical properties and phenomena in condensed-matter physics. Nano-sized ferroelectric bubble domains with various polar topologies (e.g., vortices, skyrmions) achieved in ferroelectric films present great potential for valuable physical properties. However, experimentally manipulating bubble domains has remained elusive especially in the bulk form. Here, in any bulk material, we achieve self-confined bubble domains with multiple polar topologies in bulk BiNaTiO ferroelectrics, especially skyrmions, as validated by direct Z-contrast imaging. This phenomenon is driven by the interplay of bulk, elastic and electrostatic energies of coexisting modulated phases with strong and weak spontaneous polarizations. We demonstrate reversable and tip-voltage magnitude/time-dependent donut-like domain morphology evolution towards continuously and reversibly modulated high-density nonvolatile ferroelectric memories.
在凝聚态物理中，众多的拓扑结构催生了许多具有各种物理性质和现象的“绿洲”。在铁电薄膜中实现的具有各种极性拓扑结构（如涡旋、斯格明子）的纳米级铁电泡畴展现出具有宝贵物理性质的巨大潜力。然而，通过实验操控泡畴一直难以实现，尤其是在体材料形式中。在此，在任何体材料中，我们在体相铋钠钛铁电体中实现了具有多种极性拓扑结构的自限泡畴，特别是斯格明子，这已通过直接的Z衬度成像得到验证。这种现象是由具有强自发极化和弱自发极化的共存调制相的体相能、弹性能和静电能之间的相互作用驱动的。我们展示了向连续且可逆调制的高密度非易失性铁电存储器的可逆且与尖端电压幅度/时间相关的甜甜圈状畴形态演化。
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