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Investigating the fabrication and dipole characteristics of complex ferroelectric nanoshapes

研究复杂铁电纳米形状的制造和偶极子特性

基本信息

批准号：
EP/F004869/1
负责人：
J M Gregg
金额：
$ 68.48万
依托单位：
Queen's University Belfast
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2008
资助国家：
英国
起止时间：
2008 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FF004869%2F1
关键词：
Investigating fabrication dipole characteristics complex

项目摘要

The traditional view of the ordering of polarisation or magnetisation in both ferroelectrics and ferromagnets is that local dipoles or magnetic moments are arranged into neat rows and columns, and that boundaries between neatly arranged groups must strictly conform to the crystallography of the host material (conventional stripe domains). However, recent experimental research in three-dimensionally size-constrained soft ferromagnets has revealed the existence of completely different domain states which form into vortices. As with many aspects of behaviour in ferromagnetism, analogous properties in the behaviour of the electrical polarisation in ferroelectrics is often seen, and recent modelling strongly suggests that such vortex domain states should also exist in ferroelectrics. Differences in the energetics between ferromagnets and ferroelectrics means that such unusual behaviour is only expected to dominate whenever ferroelectric dimensions are reduced to the order of ~10 nm. The creation of such small structures and the characterisation of their domain states represents a serious challenge to experimentalists involved in ferroelectric research and yet the potential for new discovery is immense. Further, simple vortex structures may only be the tip of the ice-berg, as much more exotic domain patterns have been postulated: for example some theorists have suggested the possibility of an electrostatic solenoid-analogue. Given the research performed to date, and the postulations made by theorists, the creation of three-dimensionally constrained nanostructures in ferroelectrics, and the subsequent analysis of their domain characteristics, clearly represents an exciting and challenging problem. This project will address this area of research by combining expertise in nanoscale ferroelectric fabrication with specialist characterisation techniques such as electron holography, second-harmonic near field optics, nano-Raman spectroscopy and scanning probe microscopy. The programme builds on an already established successful collaboration between ferroelectric activities in Queen's University Belfast and Cambridge, and this is augmented by international experts in specifically chosen characterisation techniques.

关于铁电体和铁磁体极化或磁化顺序的传统观点是，局部偶极子或磁矩排列成整齐的行和列，排列整齐的基团之间的边界必须严格符合主体材料的晶体学（传统的条纹域）。然而，最近对三维尺寸受限软铁磁体的实验研究表明，存在完全不同的畴态，形成漩涡。与铁磁性行为的许多方面一样，铁电体中电极化行为的类似性质经常被看到，最近的建模强烈表明，这种涡旋域状态也应该存在于铁电体中。铁磁体和铁电体之间能量学的差异意味着，只有当铁电尺寸减小到~ 10nm量级时，这种不寻常的行为才会占主导地位。这种小结构的创建及其域态的表征对参与铁电研究的实验家来说是一个严峻的挑战，但新发现的潜力是巨大的。此外，简单的涡旋结构可能只是冰山一角，因为更多的奇异域模式已经被假设：例如，一些理论家提出了静电螺线管模拟的可能性。考虑到迄今为止所进行的研究，以及理论家提出的假设，在铁电体中创建三维约束纳米结构，以及随后对其域特征的分析，显然是一个令人兴奋和具有挑战性的问题。该项目将通过将纳米级铁电制造的专业知识与专业表征技术（如电子全息术、二次谐波近场光学、纳米拉曼光谱和扫描探针显微镜）相结合，解决这一研究领域的问题。该计划建立在贝尔法斯特女王大学和剑桥大学铁电活动之间已经建立的成功合作基础上，并由专门选择表征技术的国际专家加强。