Multiferroicity in Perovskite-Type Rare-Earth Manganites

钙钛矿型稀土锰矿的多铁性

• 批准号: 1310149
• 负责人: Menka Jain
• 金额: $ 27.3万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-06-01 至 2017-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1310149&HistoricalAwards=false
• 关键词: Multiferroicity; Perovskite; Type; Rare; Earth

NON-TECHNICAL DESCRIPTION: This project explores the fundamental understanding of the structure and distortions of single-phase materials and finding new avenues to control their physical properties that may impact the advancement of multifunctional devices. The materials of interest are the magnetoelectric multiferroic rare-earth manganites in which ferroelectricity is induced when at some magnetic transition of the material. At the conclusion of this project, insights will be gained into the scientific parameters affecting the structural distortions, bond angles, magnetic, ferroelectric, and magnetoelectric properties. Furthermore, this understanding may be used in rational design of magnetoelectric multiferroics with enhanced polarization and critical temperatures. During the course of this project (i) diverse undergraduate and graduate students are being trained and mentored; (ii) results are being incorporated to refine physics and functional materials courses; and (ii) the results are being disseminated to a much broader audience through an energy club (working in cooperation with local libraries), hosting summer research opportunity for local high school teachers (at the University of Connecticut), and close interactions with students at Alabama A&M University. TECHNICAL DETAILS: The PI and her team are synthesizing single-phase pure and A/B-site doped orthorhobmically distorted perovskite rare-earth manganites that show magnetoelectric multiferroic properties. Basic scientific research is focused on controlling the average ionic radius, ionic size mismatch, and magnetic properties of the doped ions at the A- and B-sites of the rare-earth manganites and on studying their effect on the structure, distortion, magnetic properties, ferroelectric transition, and magnetoelectric coupling. Various state-of-the-art characterization techniques and calculations at university and national laboratories are being utilized to train undergraduate and graduate students in order to investigate the comprehensive understanding of structure-distortion-property correlations in these material systems. The investigation anticipates the rational design of magnetoelectric multiferroics with enhanced electric polarization and/or critical temperatures, which potentially impacts the advancement of magnetoelectric based devices in consumer electronics, health care, and military systems.

非技术描述：该项目探索对单相材料的结构和变形的基本理解，并寻找控制其物理特性的新途径，这些物理特性可能会影响多功能设备的进步。感兴趣的材料是磁电多铁性稀土锰酸盐，其中当材料发生某些磁转变时会感应出铁电性。在该项目结束时，将深入了解影响结构扭曲、键角、磁性、铁电性和磁电性的科学参数。此外，这种理解可用于具有增强极化和临界温度的磁电多铁性材料的合理设计。在该项目期间（i）正在培训和指导不同的本科生和研究生； (ii) 结果正在被纳入完善物理和功能材料课程； (ii) 通过能源俱乐部（与当地图书馆合作）、为当地高中教师（康涅狄格大学）举办暑期研究机会以及与学生的密切互动，将研究结果传播给更广泛的受众。阿拉巴马农工大学。技术细节：PI 和她的团队正在合成单相纯和 A/B 位掺杂正交扭曲钙钛矿稀土锰氧化物，其表现出磁电多铁性。 基础科学研究重点是控制稀土锰酸盐A位和B位掺杂离子的平均离子半径、离子尺寸失配和磁性能，并研究它们对结构、畸变、磁性能的影响、铁电转变和磁电耦合。大学和国家实验室正在利用各种最先进的表征技术和计算来培训本科生和研究生，以研究对这些材料系统中结构-扭曲-性质相关性的全面理解。该研究预计具有增强电极化和/或临界温度的磁电多铁性材料的合理设计，这可能会影响消费电子、医疗保健和军事系统中基于磁电的设备的进步。