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.

技术摘要铁磁性材料是功能材料的一个重要子类，其物理性质对电场和磁场的变化敏感。多铁性材料是表现出两种或多种主要铁性（铁磁性、铁电性、铁弹性）的材料。 铁磁和铁电材料的复合材料将允许磁和电子系统之间的耦合，该子系统由机械力介导，并且是磁电（ME）多铁性。 这种复合材料为研究磁电耦合物理提供了机会，并且在新型器件方面具有巨大的潜力。该项目将把磁电相互作用的研究扩展到梯度铁磁性的新领域。 最近对成分梯度铁磁体和铁电体的研究发现了新现象，包括内部电位、诱导各向异性和自发应变。 计划的工作将涉及铁氧体和铁电体功能梯度双层和多层的合成，以及梯度效应和 ME 相互作用性质的研究。 分级将涉及铁氧体中的压磁耦合和铁电体中的压电系数，并将通过对化学成分进行分级来完成。 ME相互作用的研究将在1 mHz以上进行？ 110 GHz，包括低频效应以及机电、铁磁和磁声谐振的耦合。博士后研究员、研究生和本科生以及高中实习生将参与该研究。 还计划与工业界合作进行技术转让。非技术摘要该项目研究的是能够将电能转化为磁能的复合材料，在能量收集、能量存储和消费电子产品方面具有巨大的应用潜力。该复合材料将具有两个组件，它们通过产生机械变形来单独响应电场或磁场。该项目旨在调整两相的特性，以改善机械响应，从而提高能量转换效率。 以受控方式改变各相的化学成分是将探索实现这些目标的途径。将合成具有成分变化的各个相和复合材料，并根据对能量转换重要的性能进行表征。博士后研究员、研究生和本科生以及高中实习生将参与该研究。还计划与工业界合作进行技术转让。