Large controllability of domain evolution in ferroelectric nanodot via isotropic surface charge screening

Large controllability of domain evolution in ferroelectric nanodot via isotropic surface charge screening
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通过各向同性表面电荷筛选实现铁电纳米点域演化的大可控性

DOI:
10.1007/s00339-016-0296-0
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发表时间:
2016-08
影响因子:
2.7
通讯作者:
Zheng Yue
Zheng Yue
中科院分区:
材料科学4区
文献类型:
--
作者:
Xiong W. M.;Sheng Qiang;Chen W. J.;Wu C. M.;Wang Biao;Zheng Yue

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本工作报道了利用各向同性表面电荷屏蔽(SCS)对BaTiO_3铁电纳米点的磁畴演化进行很大的可控性。相场模拟表明,随着温度和屏蔽因子的变化以及这两个变量的方向变化,纳米点可以呈现出丰富的微区图案和演化路径。模拟了四种典型的实验过程,包括固定条件下的降温和升温过程,以及固定温度下的增温和降温过程。在这些过程中,纳米点表现出多达13种不同的结构域图案,其中一些是极性或环形的,有些既是极性的又是环形的。我们总结了相图作为温度和电荷屏蔽因子的函数,并分析了典型的磁畴演化路径。
This work reports a large controllability of domain evolution in BaTiO3ferroelectric nanodot by isotropic surface charge screening (SCS). The phase field simulations show that the nanodot can exhibit fruitful domain patterns and evolution paths as functions of temperature and screening factor and changing direction of these two variables. Four typical types of experimental processes have been simulated, including the cooling-down and heating-up processes under fixed SCS conditions, and the processes of increasing and decreasing SCS under fixed temperatures. During these processes, the nanodot exhibits up to 13 different kinds of domain patterns, among which some are either polar or toroidal and some are both polar and toroidal. We summarized the phase diagrams as functions of temperature and charge screening factor, and also analyzed the typical domain evolution paths.
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期刊: Physical Review B
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