CAREER:Magnetoelectric coupling in bulk and thin film multiferroics

非技术摘要同时具有磁偶极子和电偶极子有序的材料，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，最终可能在特定应用中取代当前技术。然而，在将这些概念转化为实际器件之前，有必要了解导致多铁有序的机制。韦恩州立大学的这个教师早期职业发展(CALEAR)项目的目标是解释如何在同一温度下同时产生磁性和铁电秩序。该项目将使用激光和中子散射等技术，研究在外加电场和磁场下，有序磁偶极子和电偶极子如何在多铁性材料中相互作用。这些研究将有助于解释多铁体中磁偶极子和电偶极子是如何相互通信的，这将对设计更好的创新器件材料至关重要。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。这一激动人心的研究领域的亮点将被纳入底特律地区高中生的专题讲座和演示中。技术摘要韦恩州立大学的这一教师早期职业发展(CALEAR)项目将研究特定多铁氧化物在单一相变时磁性和铁电有序的同时发展。这些材料中的磁性和铁电自由度之间的相互作用为研究“软”材料中的自旋-电荷耦合提供了一个非同寻常的机会，这些“软”材料在外加磁场的作用下其物理性质发生了戏剧性的变化。这个项目将通过使用包括拉曼光谱和光学光谱、中子散射和热力学表征在内的各种技术来研究外加电场和磁场下的低能激发，来探索多铁体中磁电耦合的微观机制。我们将合成多铁性薄膜样品，以研究受限几何结构对多铁性有序的影响。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。这一激动人心的研究领域的亮点将被纳入底特律地区高中生的专题讲座和演示中。

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.