Self-similar nested flux closure structures in a tetragonal ferroelectric.
Self-similar nested flux closure structures in a tetragonal ferroelectric.
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DOI：
10.1021/nl400629m
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发表时间：
2013-05
期刊：
影响因子：
10.8
通讯作者：
L. Chang;Valanoor Nagarajan;James F. Scott;J. Gregg
中科院分区：
文献类型：
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作者：
L. Chang;Valanoor Nagarajan;James F. Scott;J. Gregg
在特定的固态材料中，在适当的条件下，磁偶极子的集合可以自发地形成各种相当复杂的几何图案，例如漩涡和skyrmion结构。虽然从理论上讲，类似的模式应该由电偶极子形成，但迄今为止它们还没有被清楚地观察到：因此，显然需要继续进行实验探索。在这封信中，我们报告了由于表面相关的去极化场，在薄单晶铁电片的边缘自发形成的相当复杂的畴排列的发现。极化模式使得纳米尺度的“通量闭合”回路嵌套在更大的中尺度通量闭合对象中。尽管大小有数量级的差异，但双尺度通量闭合实体的几何形式相当相似。
In specific solid-state materials, under the right conditions, collections of magnetic dipoles are known to spontaneously form into a variety of rather complex geometrical patterns, exemplified by vortex and skyrmion structures. While theoretically, similar patterns should be expected to form from electrical dipoles, they have not been clearly observed to date: the need for continued experimental exploration is therefore clear. In this Letter we report the discovery of a rather complex domain arrangement that has spontaneously formed along the edges of a thin single crystal ferroelectric sheet, due to surface-related depolarizing fields. Polarization patterns are such that nanoscale "flux-closure" loops are nested within a larger mesoscale flux closure object. Despite the orders of magnitude differences in size, the geometric forms of the dual-scale flux closure entities are rather similar.