Polarization Closure in PbZr(0.42)Ti(0.58)O3 Nanodots
Polarization Closure in PbZr(0.42)Ti(0.58)O3 Nanodots
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DOI：
10.1021/nl2031103
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发表时间：
2011-10-01
期刊：
影响因子：
10.8
通讯作者：
Gregg, J. M.
中科院分区：
文献类型：
--
作者：
McGilly, L. J.;Gregg, J. M.
在PbZr（0.42）Ti（0.58）O3单晶铁电纳米点，通过居里温度冷却形成的域状态，通过透射电子显微镜成像。在大多数情况下，发现90度条纹域形成四个不同的“束”或象限。在系统中的偶极子取向进行了详细的分析，使用暗场成像和假设带电畴壁是积极不利的相比，不带电的墙壁。在此基础上，我们得出结论，在这些纳米点中的偶极子的安排，使所得的极化，与四象限域束，形成一个闭环。这种“极化闭合”模式让人想起在软铁磁微点中已经普遍观察到的磁通闭合，但迄今为止在类似的铁电点中看不到。
Domain states in PbZr(0.42)Ti(0.58)O3 single-crystal ferroelectric nanodots, formed on cooling through the Curie temperature, were imaged by transmission electron microscopy. In the majority of cases, 90 degrees stripe domains were found to form into four distinct "bundles" or quadrants. Detailed analysis of the dipole orientations in the system was undertaken, using both dark-field imaging and an assumption that charged domain walls were energetically unfavorable in comparison to uncharged walls. On this basis, we conclude that the dipoles in these nanodots are arranged such that the resultant polarizations, associated with the four quadrant domain bundles, form into a closed loop. This "polarization closure" pattern is reminiscent of the flux-closure already commonly observed in soft ferromagnetic microdots but to date unseen in analogous ferroelectric dots.