Room Temperature Magnetoelectric & Multiferroic Films and Composites for novel Devices

常温磁电

• 批准号: 261662-2013
• 负责人: PIGNOLET, Alain
• 金额: $ 2.99万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=662182
• 关键词: Room; Temperature; Magnetoelectric; Multiferroic; Films

The next generation of miniaturized devices will increasingly rely on "smart materials", materials with the uncanny ability to respond to an external stimulus by abruptly changing their properties in a reversible manner. Multiferroics, exhibiting at once, a magnetic and a ferroelectric ordering are potentially such smart materials. While the interplay between magnetic ordering and ferroelectricity in these compounds is presently one of the unanswered fundamental questions in condensed matter physics, the occurrence of both orders simultaneously is rare and very often occurs at low temperature. The recent emergence of thin films and nanostructures of materials with good multiferroic properties at room temperature has been a turning point opening the way for using multiferroics/magnetoelectrics into novel integrated devices, in areas such as sensing, energy conversion, as well as photonics and high-frequency electronics for telecommunication.**This research program will focus on investigating exclusively single phase and in-situ forming nanocomposites systems that are multiferroic at room temperature. It will concentrate on studying their magnetoelectric coupling as well as their high-frequency dynamic behavior, which are key properties for applications. The room temperature multiferroic epitaxial thin films of the Bi-based double perovskites and in-situ generated multiferroic nanocomposites discovered and developed in my group will be further studied, while new room temperature multiferroic systems will be investigated as well, such as doped bismuth ferrite and tetragonal tungsten bronze/barium ferrite. Proof-of-concept devices will be fabricated with the room temperature magnetoelectric films synthesized and studied. Finally, the electromechanical properties of nanocrystalline cellulose individual fibers will be studied at the nanoscale using piezoresponse force microscopy, a step toward a cheap novel piezoelectric technological materials based on a resource abundant in Canada and in the world. **This research program will provide a stimulating training environment at the leading edge of today's research in the field of multiferroic and magnetoelectric smart materials.

下一代微型设备将越来越依赖“智能材料”，这些材料具有通过以可逆方式突然改变其特性来响应外部刺激的不可思议的能力。同时表现出磁性和铁电有序性的多铁性材料可能是此类智能材料。虽然这些化合物中磁有序性和铁电性之间的相互作用是目前凝聚态物理中尚未解答的基本问题之一，但这两种有序性同时出现的情况很少见，而且经常发生在低温下。最近出现的在室温下具有良好多铁性的薄膜和纳米结构材料是一个转折点，为将多铁性/磁电性用于新型集成器件开辟了道路，涉及传感、能量转换以及电信用光子学和高频电子学等领域。**该研究计划将专注于专门研究单相和原位成形 在室温下具有多铁性的纳米复合材料系统。它将集中研究它们的磁电耦合及其高频动态行为，这是应用的关键特性。本课题组将进一步研究开发的Bi基双钙钛矿室温多铁性外延薄膜和原位生成的多铁性纳米复合材料，同时也将研究新的室温多铁性体系，如掺杂铋铁氧体和四方钨青铜/钡铁氧体。将使用合成和研究的室温磁电薄膜来制造概念验证设备。最后，将使用压电响应力显微镜在纳米尺度上研究纳米晶纤维素单纤维的机电性能，这是基于加拿大和世界丰富资源的廉价新型压电技术材料的一步。 **该研究计划将为当今多铁性和磁电智能材料领域的前沿研究提供令人兴奋的培训环境。