CAREER:Magnetoelectric coupling in bulk and thin film multiferroics

职业：块体和薄膜多铁性材料中的磁电耦合

• 批准号: 0644823
• 负责人: Gavin Lawes
• 金额: $ 50万
• 依托单位: Wayne State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-01 至 2013-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0644823&HistoricalAwards=false
• 关键词: CAREER; Magnetoelectric; coupling; bulk; thin

Non-Technical Abstract Materials that have simultaneous magnetic dipole and electric dipole order, called multiferroics, offer the potential for developing entirely new types of technological applications. Next generation multiferroic devices, including low-power/high-speed voltage switchable magnetic memory, may eventually replace current technologies for specific applications. However, before these concepts can be translated into real devices, it is necessary to understand the mechanisms giving rise to multiferroic order. The goal of this Faculty Early Career Development (CAREER) project at Wayne State University is to explain how magnetic and ferroelectric order can arise simultaneously at a single temperature. This project will investigate how ordered magnetic and electric dipoles interact in multiferroics under applied electric and magnetic fields using laser light and neutron scattering, among other techniques. These studies will help to explain how the magnetic and electric dipoles commun icate with one another in multiferroics, which will be crucial for designing better materials for innovative devices. This project will provide a platform for training the next generation of scientists through direct participation of graduate, undergraduate, and high school students in materials science research. Highlights from this exciting area of research will be incorporated into special topics lectures and demonstrations for Detroit area high school students. Technical AbstractThis Faculty Early Career Development (CAREER) project at Wayne State University will investigate the simultaneous development of magnetic and ferroelectric order at a single phase transition in specific multiferroic oxides. The interplay between magnetic and ferroelectric degrees of freedom in these materials offers an extraordinary opportunity to study spin-charge coupling in "soft" materials that exhibit dramatic changes in their physical properties under externally applied fields. This project will explore the microscopic mechanisms for magnetoelectric couplings in multiferroics by studying low energy excitations under applied electric and magnetic fields using a variety of techniques including Raman and optical spectroscopy, neutron scattering, and thermodynamic characterization. Multiferroic thin film samples will be synthesized to investigate how a restricted geometry affects multiferroic order. This project will provide a platform for training the next generation of scientists through direct participation of graduate, undergraduate, and high school students in materials science research. Highlights from this exciting area of research will be incorporated into special topics lectures and demonstrations for Detroit area high school students.

同时具有磁偶极和电偶极序的材料，称为多铁性材料，为开发全新类型的技术应用提供了潜力。 下一代多铁性器件，包括低功率/高速电压可切换磁存储器，可能最终取代当前特定应用的技术。 然而，在将这些概念转化为真实的器件之前，有必要了解产生多铁性有序的机制。 这个韦恩州立大学的教师早期职业发展（CAREER）项目的目标是解释磁性和铁电秩序如何在单一温度下同时出现。本计画将利用雷射光与中子散射等技术，探讨在外加电场与磁场下，多铁性材料中有序磁偶极与电偶极如何交互作用。这些研究将有助于解释磁偶极子和电偶极子如何在多铁性中相互通信，这对于设计更好的创新设备材料至关重要。 该项目将通过研究生、本科生和高中生直接参与材料科学研究，为培养下一代科学家提供一个平台。 从这个令人兴奋的研究领域的亮点将被纳入专题讲座和底特律地区高中学生的示范。技术摘要韦恩州立大学的这一教师早期职业发展（CAREER）项目将研究特定多铁性氧化物在单一相变时磁性和铁电性顺序的同时发展。 在这些材料中的磁性和铁电自由度之间的相互作用提供了一个非凡的机会，研究自旋电荷耦合的“软”材料，表现出显着的变化，其物理性质在外部施加的领域。本计画将利用拉曼光谱、光学光谱、中子散射、热力学特性等技术，研究外加电场与磁场下的低能激发，探讨多重铁性材料中磁电耦合的微观机制。 多铁性薄膜样品将被合成，以调查如何限制几何影响多铁性秩序。该项目将通过研究生、本科生和高中生直接参与材料科学研究，为培养下一代科学家提供一个平台。 从这个令人兴奋的研究领域的亮点将被纳入专题讲座和底特律地区高中学生的示范。