Self-Assembled and Modulated Domain Epitaxial Oxide Heterostructures

9633638 Roytburd这个理论和实验相结合的研究项目旨在对外延系统中应变控制的结构调制(合作有序化)进行严格的理论理解和实验验证。我们将研究钙钛矿等金属氧化物在相干约束条件下固态转变的基本问题，以了解转变的机制和动力学参数，以及开发新的途径来设计和实现异质结构和超晶格层中横向调制的磁畴和异相微结构。我们将探索超晶格层中横向调制的关联以及三维超晶格的可能性。固-固相变中调制结构演化的热力学和动力学将在铁电、铁弹性和铁磁相变中具体研究。该项目是多学科的，结合了基础材料理论和实验合成和加工研究，并使用先进的表征工具和分析方法来解决具有技术相关性和高潜在回报的热门领域的前沿问题。这项研究将在基础水平上为先进电子设备和集成电路的几个方面贡献基本的材料科学知识。从这项研究项目中获得的知识和理解有望为改进材料和材料组合的设计和生产提供基本的理解和基础，从而在总体上为提高先进器件和电路的性能做出贡献。该计划的一个重要特点是通过在一个具有根本意义和技术意义的领域对学生进行培训，将研究和教育结合起来。***

9633638 Roytburd This combined theory and experiment research project aims for a rigorous theoretical understanding and experimental verification of strain controlled structural modulation(cooperative ordering) in epitaxial systems. Fundamental aspects of solid state transformation under coherently constrained conditions in metal oxides such as perovskites will be studied with respect to understanding the mechanisms and kinetic parameters of the transformations, and with respect to developing new routes to the design and realization of transversely modulated domain and heterophase microstructures inside heterostructure and superlattice layers. The correlation of transversal modulations in layers of superlattices and possibility of 3-dimensional superlattices will be explored. The thermodynamics and kinetics of the evolution of modulated structures in solid-solid phase transformations will be studied specifically in ferroelectric, ferroelastic, and ferromagnetic transformations. %%% The project is multidisciplinary combining fundamental materials theory and experimental synthesis and processing studies with advanced characterization tools and analysis methods to address forefront issues in a topical area of technological relevance and high potential payoff. The research will contribute basic materials science knowledge at a fundamental level to several aspects of advanced electronic devices and integrated circuitry. The knowledge and understanding gained from this research project is expected to contribute in a general way to improving the performance of advanced devices and circuits by providing a fundamental understanding and a basis for designing and producing improved materials, and materials combinations. 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. ***