Multiferroic Nanostructured Thin Films

多铁性纳米结构薄膜

• 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; Multiferroic; Nanostructured; Thin; Films

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.

多种材料涵盖了现象和应用的丰富多样性。它们具有引人注目的特征，例如电磁，电 - 弹性和电磁特性的交叉耦合，并且非常需要进一步的研究，从原子缺陷到纳米尺度壁，域壁的纳米级结构，域的纳米级结构，外延应力和应变的紧张和对跨度的质量效果的质量依次，以使其与较大的效果产生影响。铁电磁性具有铁电性。为了实现这一目标，我们需要同时室温铁电和铁磁磁性。氧化钙钛矿是一个非凡的材料家族，可以掺杂以提供大量功能。从本地化到巡回的电子行为以及从铁电行为到抗FE状态的过渡取决于原子量表的不稳定性冲突。问题：真正的多效材料是一种单一材料（例如二氧化铁氧体）表现出多表情行为的材料。问题在于，所有真实的多效材料都没有足够的现象之间的耦合，无法对设备有用。当在单个材料中实现时，关键特性会损害。解决方案：在此提案中，我们将制作例如铁电，铁磁和压电材料分别，但在人工超级细胞中近距离。通过这样做，我们可以优化单个材料的关键特性，但在宏观尺度上确保材料之间的耦合以获得良好的设备性能。