Functionally Graded Ferroics and Magnetoelectric Interactions

功能梯度铁基材料和磁电相互作用

• 批准号: 0902701
• 负责人: Gopalan Srinivasan
• 金额: $ 34万
• 依托单位: Oakland University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2014-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0902701&HistoricalAwards=false
• 关键词: Functionally; Graded; Ferroics; Magnetoelectric; Interactions

Technical AbstractFerroics form an important sub-group of functional materials whose physical properties are sensitive to changes in electric and magnetic fields. A multiferroic is a material that exhibits two or more of the primary ferroic properties (ferromagnetism, ferroelectricity, ferroelasticity). A composite of ferromagnetic and ferroelectric materials will allow coupling between magnetic and electric subsystems that is mediated by mechanical forces and is a magneto-electric (ME) multiferroic. Such composites provide the opportunity for studies on the physics of ME coupling and have enormous potential for novel devices. This project will expand research on magneto-electric interactions to the new frontier of graded ferroics. Recent studies on compositionally graded ferromagnets and ferroelectrics have discovered new phenomena including internal potentials, induced anisotropy, and spontaneous strains. The planned efforts will involve the synthesis of functionally graded bilayers and multilayers of ferrites and ferroelectrics and studies on the effects of grading and the nature of ME interactions. The grading will involve piezomagnetic coupling in ferrites and piezoelectric coefficient in ferroelectrics and will be accomplished by grading the chemical composition. Studies on ME interactions will be done over 1 mHz ? 110 GHz including low-frequency effects and coupling at electromechanical, ferromagnetic and magnetoacoustic resonances. Postdoctoral research associates, graduate and undergraduate students and high school interns will participate in the research. Collaboration with industry is also planned for technology transfer.Non-Technical AbstractThis project is on composite materials that are capable of converting electrical energy to magnetic energy and have enormous potential for use in energy harvesting, energy storage and consumer electronics. The composite will have two components that respond individually to electric or magnetic field by producing a mechanical deformation. The project is aimed at tailoring properties of the two phases to accomplish improved mechanical response, and therefore, enhancement in the energy conversion efficiency. Changes in the chemical composition of each phase in a controlled manner are the avenue that will be explored to achieve these goals. Individual phases and composites with composition variations will be synthesized and characterized in terms of properties of importance for energy conversion. Postdoctoral research associates, graduate and undergraduate students and high school interns will participate in the research. Collaboration with industry is also planned for technology transfer.

技术摘要范围构成了功能材料的重要子组，其物理特性对电场和磁场的变化敏感。多效原则是一种表现出两种或多种主要铁质特性（铁磁性，铁电性，铁弹性）的材料。 铁电磁和铁电材料的复合材料将允许在机械力介导的磁性和电源子系统之间耦合，并且是一种磁电力（ME）多效性。 这样的复合材料为研究我耦合的物理学提供了机会，并具有新型设备的巨大潜力。该项目将将对磁性相互作用的研究扩展到渐变的铁反领域。 关于成分分级的铁磁体和铁电的最新研究发现了包括内部电位，诱导各向异性和自发性菌株在内的新现象。 计划的努力将涉及功能分级的双层和铁素体的多层综合，以及对分级和ME相互作用的影响的研究。 该分级将涉及铁氧体和铁电的压电系数中的压电磁耦合，并通过对化学成分进行分级来实现。 对我的互动研究将超过1 MHz？ 110 GHz，包括在机电，铁磁和磁声共振下进行低频效应和耦合。博士后研究员，研究生和本科生以及高中实习生将参加这项研究。 还计划与行业合作进行技术传输。没有技术抽象的项目是在能够将电能转换为磁能的复合材料上，并且具有在能源收集，能源存储和消费电子产品中使用的巨大潜力。该复合材料将通过产生机械变形来单独响应电场或磁场。该项目旨在调整这两个阶段的特性，以提高机械响应，从而提高能量转化效率。 每个阶段的化学成分以受控方式的变化是将探索以实现这些目标的途径。具有组成变化的各个相和复合材料将以对能量转化的重要性的特性进行合成和表征。博士后研究员，研究生和本科生以及高中实习生将参加这项研究。还计划与行业合作进行技术转让。