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Multiferroic Nanostructured Thin Films

多铁性纳米结构薄膜

基本信息

批准号：
EP/F015518/1
负责人：
Neil Alford
金额：
$ 43.75万
依托单位：
Imperial College London
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%2FF015518%2F1
关键词：
Multiferroic Nanostructured Thin Films

项目摘要

Multiferroic materials span a rich diversity of phenomena and applications. They have striking features such as cross-coupling of electro-magnetic, electro-elasto and electro-optic properties and there is a tremendous need for further research bridging all the way from atom defects, nanoscale structure of domain walls, epitaxial stress and strain, to their order of magnitude impact on macroscale properties.The challenge is to combine ferromagnetism with ferroelectricity and then to couple ferromagnetism with ferroelectricity. In order to achieve this we need simultaneous room temperature ferroelectricity and ferromagnetism. Oxide perovskites are a remarkable family of materials that can be doped in order to provide a huge range of functions. Transitions from localised to itinerant electronic behaviour and from ferroelectric to anti FE states are determined by conflicting instabilities on an atomic scale. The Problem: A true multiferroic material is one where a single material, such as bismuth ferrite, exhibits multiferroic behaviour. The problem is that all true multiferroic materials possess insufficient coupling between phenomena to be useful for devices. The key properties are compromised when realised in a single material.The Solution: In this proposal we will make films of e.g. ferroelectric, ferromagnetic and piezoelectric material separately, but in close proximity in an artificial supercell. By doing this we can optimise the key properties of the single material but on a macroscopic scale ensure coupling between the materials to obtain good device performance.

多铁性材料涵盖了丰富多样的现象和应用。它们具有电磁、电弹性和电光特性的交叉耦合等显著特征，从原子缺陷、畴壁的纳米结构、外延应力和应变到它们对宏观尺度特性的影响，都需要进一步的研究，其挑战在于将铁磁性和铁电性联合收割机结合起来，进而将铁磁性和铁电性耦合起来。为了实现这一点，我们需要同时室温铁电性和铁磁性。氧化物钙钛矿是一个引人注目的材料家族，可以掺杂以提供广泛的功能。从本地化的巡回电子行为和铁电反FE状态的转变是由原子尺度上的冲突不稳定性。问题：一个真正的多铁性材料是一个单一的材料，如铁酸铋，表现出多铁性行为。问题是，所有真正的多铁性材料都没有足够的现象之间的耦合来用于设备。解决方案：在这个方案中，我们将分别制作铁电、铁磁和压电材料的薄膜，但在人造超电池中紧密靠近。通过这样做，我们可以优化单一材料的关键特性，但在宏观尺度上确保材料之间的耦合，以获得良好的器件性能。