Engineering Interface Magnetism via Defect Control in Complex Oxide Heterostructures

通过复杂氧化物异质结构中的缺陷控制来工程界面磁性

• 批准号: 1206278
• 负责人: Christopher Leighton
• 金额: $ 36万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-01 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1206278&HistoricalAwards=false
• 关键词: Engineering; Interface; Magnetism; via; Defect

****Technical Abstract****Complex oxide materials have proven to be an extraordinary platform for discovery of new and useful physical phenomena. Assembling these materials into artificial heterostructures provides a plethora of further opportunities, both for discovery of new science, and for applications in areas such as ferroelectric RAM, fuel cells, and spintronics. However, in order to fully exploit these materials some serious open issues must be resolved, particularly with respect to interfacial strain and defects. The goal of this project is to achieve exactly this, using cobalt oxides as model systems to understand the interplay between strain state, oxygen vacancy formation and ordering, and interface magnetism/electronic transport. Specific opportunities include the use of strain-control over oxygen defects to precisely engineer interfacial magnetic and electronic properties, and the possibility of synthesizing defect-free materials to probe new physics recently predicted by theory. The research will have impact well beyond the immediate disciplines in which it is performed, due to its relevance to emerging technologies, the exceptional educational opportunities provided to students, and inclusion of under-represented groups. Outreach to the public will also be achieved via development of an interactive presentation for the Properties of Matter module in the Minneapolis Public School System, impacting hundreds of 8th grade students. ****Non-Technical Abstract****Complex oxides, formed by bonding atoms of multiple metallic elements with oxygen, are a set of materials that display extraordinary diversity in physical and chemical properties, yielding some of the most important discoveries in physics. The recently recognized ability to incorporate these materials into artificial structures where multiple oxides are laminated together, with atomic-scale precision, provides a means to fully exploit their properties in a wide variety of applications. These include zero boot-up time memory, clean-burning fuel cells, and low power consumption high-speed electronics. However, critical unsolved issues hinder progress in this area, particularly the formation of unwanted defects associated with missing oxygen atoms. In this project a specific set of complex oxide materials are being used to understand what factors control the formation and arrangement of these defects, the influence they have on properties, and the means by which we can control them. The ultimate goal is to be able to precisely control electronic and magnetic behavior at oxide interfaces in order to fully exploit their unique properties in a wide variety of new devices. The research will have broad impact due to its relevance to emerging technologies, the exceptional educational opportunities provided to students, and inclusion of under-represented groups. Outreach to the public will also be achieved via development of an interactive presentation for the Properties of Matter module in the Minneapolis Public School System, impacting hundreds of 8th grade students.

* 技术摘要 * 复合氧化物材料已被证明是发现新的有用物理现象的非凡平台。将这些材料组装成人工异质结构提供了大量的进一步机会，无论是发现新的科学，还是在铁电RAM，燃料电池和自旋电子学等领域的应用。然而，为了充分利用这些材料，必须解决一些严重的公开问题，特别是关于界面应变和缺陷。该项目的目标就是实现这一点，使用钴氧化物作为模型系统来了解应变状态，氧空位形成和有序化以及界面磁性/电子输运之间的相互作用。具体的机会包括使用对氧缺陷的应变控制来精确地设计界面磁和电子特性，以及合成无缺陷材料来探测理论最近预测的新物理的可能性。该研究的影响将远远超出其执行的直接学科，由于其与新兴技术的相关性，为学生提供的特殊教育机会，以及代表性不足的群体。与公众的联系也将通过在明尼阿波利斯公立学校系统的物质模块的属性的交互式演示文稿的发展，影响数百名八年级学生实现。 * 非技术摘要 * 复合氧化物是由多种金属元素的原子与氧结合形成的，是一组在物理和化学性质上显示出非凡多样性的材料，产生了一些物理学上最重要的发现。最近认识到的能力，将这些材料纳入人工结构，其中多个氧化物层压在一起，原子级精度，提供了一种手段，充分利用其性能在各种各样的应用。这些技术包括零启动时间记忆、清洁燃料电池和低功耗高速电子设备。然而，关键的未解决的问题阻碍了这一领域的进展，特别是与缺失氧原子相关的不必要的缺陷的形成。在这个项目中，一组特定的复合氧化物材料被用来了解哪些因素控制这些缺陷的形成和排列，它们对性能的影响，以及我们可以控制它们的方法。最终目标是能够精确控制氧化物界面的电子和磁性行为，以便在各种新器件中充分利用其独特的特性。这项研究将产生广泛的影响，因为它与新兴技术的相关性，为学生提供的特殊教育机会，以及代表性不足的群体的包容性。与公众的联系也将通过在明尼阿波利斯公立学校系统的物质模块的属性的交互式演示文稿的发展，影响数百名八年级学生实现。