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：该项目探讨了对单相材料的结构和扭曲的基本理解，并找到了新的途径来控制其物理特性，这可能会影响多功能设备的发展。感兴趣的材料是磁性多性稀土锰锰矿，其中在材料的某些磁性转变处诱导铁电性。在该项目的结论结束时，将获得影响结构扭曲，键角，磁性，铁电和磁电特性的科学参数。此外，这种理解可用于具有增强极化和临界温度的磁电多效应的合理设计。在这个项目的过程中（i）多样化的本科生和研究生正在接受培训和指导； （ii）正在纳入结果以完善物理和功能材料课程； （ii）结果通过能源俱乐部（与当地图书馆合作），为当地高中教师（在康涅狄格大学的大学）主持夏季研究机会，并与阿拉巴马州A＆M大学的学生进行密切互动。技术细节：PI和她的团队正在合成单相纯净的和A/B位的掺杂型正骨扭曲的perovskite稀土锰米粉，以显示磁性多性性质。 基础科学研究的重点是控制稀土锰木片的A和B点的掺杂离子的平均离子半径，离子大小不匹配以及磁性特性，并研究其对它们对结构，失真，磁性，铁电转换以及磁电性耦合的影响。大学和国家实验室的各种最先进的特征技术和计算被用于培训本科生和研究生，以调查对这些材料系统中结构 - 延伸 - 跨性别相关性的全面理解。该调查预测，具有增强的电化和/或临界温度的磁电多表演的合理设计，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发展。