Spinel Structure Oxide Thin Films and Interfaces

尖晶石结构氧化物薄膜和界面

• 批准号: 0604277
• 负责人: Yuri Suzuki
• 金额: $ 34.91万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0604277&HistoricalAwards=false
• 关键词: Spinel; Structure; Oxide; Thin; Films

Technical: This project focuses on thin film oxide heterostructures. The objective is to understand novel magnetic and electronic phenomena associated with the interface between two dissimilar transition metal oxides through achievement of atomically smooth spinel structure oxide interfaces. Understanding how imbalances in valence, bandwidth and interaction lengths at the interface give rise to charge redistribution and magnetic and orbital order at the interface different from the bulk forms the basis of the project. Isostructural complex oxide heterostructures provide model systems where imbalances in valence, bandwidth and interaction length will be systematically studied. The approach includes: (i) synthesis of atomically smooth, spinel structure oxide thin films; (ii) synthesis of isostructural heterostructures with atomically sharp interfaces; (iii) local electronic and magnetic characterization of surfaces and interfaces by X-ray magnetic circular dichroism (XMCD), photoemission electron microscopy (PEEM), X-ray resonant scattering (XAS), magnetic force microscopy (MFM), transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS); and (iv) electronic transport and magnetic characterization of heterostructures. Fundamental understanding of the role of band structures, electron densities, and interaction length imbalances on charge redistribution and magnetic and orbital order at the interface different from the bulk is sought. New knowledge and understanding from this research is anticipated for oxide systems, and more broadly in interface physics and materials science. Non-technical: The project addresses basic research issues in a topical area of materials science having high technological relevance. The research will contribute basic materials science knowledge at a fundamental level to new understanding and capabilities for potential next generation electronic/magnetic devices. An important feature of the program is the integration of research and education through the training of students in a fundamentally and technologically significant area. The project includes graduate and undergraduate student activities in the laboratory and in the classroom through a magnetics curriculum which also extends to local high school students. An internship program will be continued with a local high school and the scope of this interaction is expected to grow over the next three years. Graduate and undergraduate students will have the opportunity to mentor these high school interns during parts of the school year and in the summer. In cooperation with physics teachers from the high school, a modular materials science curriculum will also be developed.

技术：本项目主要研究氧化薄膜异质结构。目的是通过实现原子光滑尖晶石结构氧化物界面，了解与两种不同过渡金属氧化物界面相关的新型磁性和电子现象。了解界面上的价态、带宽和相互作用长度的不平衡如何导致电荷再分配以及界面上与体不同的磁性和轨道顺序，形成了该项目的基础。等结构复杂氧化物异质结构提供了模型系统，其中在价，带宽和相互作用长度的不平衡将被系统地研究。该方法包括：(1)合成原子光滑的尖晶石结构氧化物薄膜；（ii）具有原子尖锐界面的异质结构的合成；（iii）通过x射线磁圆二色性（XMCD）、光电电子显微镜（PEEM）、x射线共振散射（XAS）、磁力显微镜（MFM）、透射电子显微镜（TEM）和电子能量损失谱（EELS）对表面和界面进行局部电子和磁性表征；异质结构的电子输运和磁性表征。对带结构、电子密度和相互作用长度不平衡对电荷再分配以及与本体不同的界面处的磁性和轨道顺序的作用的基本理解是必不可少的。这项研究有望为氧化物系统，以及更广泛的界面物理和材料科学提供新的知识和理解。非技术：该项目涉及材料科学主题领域的基础研究问题，具有很高的技术相关性。这项研究将在基础层面上为材料科学的基础知识提供新的理解和能力，以潜在的下一代电子/磁性器件。该计划的一个重要特点是通过培养学生在一个基础和技术上重要的领域的研究和教育的整合。该项目包括研究生和本科生在实验室和课堂上的活动，通过磁学课程也扩展到当地的高中学生。与当地一所高中的实习项目将继续进行，这种互动的范围预计将在未来三年内扩大。研究生和本科生将有机会在学年的部分时间和夏季指导这些高中实习生。与高中物理教师合作，还将开发模块化材料科学课程。