An Initio Study of Magnetoelectric Multiferroic Thin Films

磁电多铁性薄膜的初步研究

• 批准号: 0605852
• 负责人: Nicola Spaldin
• 金额: $ 46.4万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0605852&HistoricalAwards=false
• 关键词: Initio; Study; Magnetoelectric; Multiferroic; Thin

TECHNICAL SUMMARY:This award supports theoretical and computational research that builds on recent advances in the fields of magnetoelectric multiferroics and thin film ferroelectrics, to design and create novel magnetoelectric multiferroics and understand their behavior in thin film form. The PI seeks to help elucidate the interplay between chemistry, ordering and strain in determining the electronic and magnetic properties of thin film magnetoelectric multiferroics. There are two sub-projects:(i) The design of novel thin film multiferroics by exploiting compositional inversion symmetrybreaking to engineer ferroelectricity into otherwise non-ferroelectric magnetic materials. This strategy enables the PI to circumvent the contraindication between the conventional mechanism for ferroelectricity and the existence of magnetism. (ii) The determination of the effects of strain on the ferroelectric behavior of multiferroics. The PI aims to identify or design multiferroics in which either, strain can be exploited to enhance the polarization, or excessive strain dependence of the polarization can be avoided.The research will also test the appropriateness of the various beyond-LDA approaches for describing strongly-correlated magnetic insulators.This award also supports the extension of a senior undergraduate / beginning graduate level Access Grid-based cyber course on Magnetism and magnetic materials developed under the previous Information Technology Research award. In an associated outreach effort, the PI plans to develop a hands-on classroom kit for teachers on Materials Chemistry for 5th Grade to address topics in the California Science Standards. The cyberinfrastructure aspects of this award include: advanced computational research, cyber course development, and fundamental materials research that contributes to the foundations of future cyberinfrastructure.NON-TECHNICAL SUMMARY:This award supports theoretical and computational research on magnetoelectric multiferroics. These are materials that simultaneously display magnetism and ferroelectricity, the electrical analog of magnetism, in the same phase. The PI aims to use theory and computation to design and create novel magnetoelectric multiferroic materials and understand their behavior in thin film form. The research will help to elucidate how the interplay between chemistry, ordering and strain determines the electronic and magnetic properties of thin film magnetoelectric multiferroics. Few multiferroic materials are currently known. They have potential technological applications in information technology and the next generation of cyberinfrastructure. In addition to possessing the combined functionalities of their parent ferromagnets and ferroelectrics, coupling between the two phenomena opens new device paradigms, in which electronic behavior is controlled by a magnetic field and magnetic behavior is controlled by an electric field. A strong collaboration with synthetic materials scientists and device physicists, aims to ensure synergy between this theoretical effort, the experimental growth and characterization of new materials, and the incorporation of newly discovered materials into devices. This award also supports the extension of a senior undergraduate / beginning graduate level Access Grid-based cyber course on Magnetism and magnetic materials developed under the previous Information Technology Research award. In an associated outreach effort, the PI plans to develop a hands-on classroom kit for teachers on Materials Chemistry for 5th Grade to address topics in the California Science Standards. The cyberinfrastructure aspects of this award include: advanced computational research, cyber course development, and fundamental materials research that contributes to the foundations of future cyberinfrastructure.

该奖项支持基于磁电多铁性和薄膜铁电体领域最新进展的理论和计算研究，以设计和创造新型磁电多铁性并了解其薄膜形式的行为。PI旨在帮助阐明化学，有序和应变之间的相互作用，在确定薄膜磁电多铁性的电子和磁性。有两个子项目：（i）通过利用成分反转的方法设计新型薄膜多铁性材料，将铁电性工程师设计成非铁电性磁性材料。这种策略使PI能够规避铁电性的传统机制和磁性的存在之间的禁忌。 (ii)应变对多铁性材料铁电行为影响的测定。PI旨在识别或设计多铁性材料，其中应变可以用来增强极化，或极化的过度应变依赖性可以避免。该研究还将测试用于描述强相关磁绝缘体的各种beyond-LDA方法的适当性。该奖项还支持扩展高年级本科生/研究生水平的Access Grid-基于网络课程的磁性和磁性材料开发下以前的信息技术研究奖。在相关的推广工作中，PI计划为五年级的材料化学教师开发一个动手课堂工具包，以解决加州科学标准中的主题。该奖项的网络基础设施方面包括：先进的计算研究，网络课程开发，以及为未来网络基础设施奠定基础的基础材料研究。非技术摘要：该奖项支持磁电多铁性的理论和计算研究。这些材料同时显示磁性和铁电性，磁性的电模拟，在同一阶段。PI旨在使用理论和计算来设计和创造新型磁电多铁性材料，并了解它们在薄膜形式下的行为。该研究将有助于阐明化学、有序化和应变之间的相互作用如何决定薄膜磁电多铁性材料的电子和磁性。目前已知的多铁性材料很少。它们在信息技术和下一代网络基础设施方面具有潜在的技术应用。除了具有其母体铁磁体和铁电体的组合功能之外，这两种现象之间的耦合开辟了新的器件范例，其中电子行为由磁场控制，磁行为由电场控制。与合成材料科学家和设备物理学家的密切合作，旨在确保这种理论工作，新材料的实验生长和表征以及将新发现的材料纳入设备之间的协同作用。该奖项还支持在以前的信息技术研究奖下开发的基于网格的磁性和磁性材料网络课程的高级本科生/初研究生水平的扩展。在相关的推广工作中，PI计划为五年级的材料化学教师开发一个动手课堂工具包，以解决加州科学标准中的主题。该奖项的网络基础设施方面包括：先进的计算研究，网络课程开发和基础材料研究，有助于未来网络基础设施的基础。