CAREER: Novel High Magnetoresistance Oxide Thin Film Materials

这个CAREER项目解决了结构扭曲在铁磁性钙钛矿材料磁性能中的作用。一个主要的目标是将结构畸变与磁性联系起来，以阐明异常大磁阻效应的起源。晶格应变的影响立方钙钛矿铁磁体薄膜生长在谨慎取向的衬底，特别是压电，将进行研究。在压电衬底上的薄膜样品中，可以通过对衬底施加电压来将应变施加到样品的外部。这些研究旨在阐明结构畸变对磁性质的影响，包括磁阻响应和居里温度，从而确定适当的理论解释。相反，改变磁相互作用强度对结构和磁性能的影响将在相关的层状铁磁钙钛矿中进行研究，这些层状铁磁钙钛矿最近才被分离出来，并在铁磁和顺磁立方钙钛矿的异质结构中进行研究。该系列薄膜样品有望独特地允许系统调谐结构和磁性能。将开发一个将磁学研究整合到本科和研究生经验中的教育计划。这包括为高级本科生和研究生开设的磁学课程，以及高级磁学实验课程和在PI实验室的本科生实习。本课程旨在为学生在材料科学、凝聚态物理和固体化学方面打下坚实的基础，特别是培养学生的实验和分析技能。该项目涉及具有高技术相关性的材料科学主题领域的前沿研究问题。总的来说，这项研究将为磁性材料和器件的重要方面提供基础材料科学知识。此外，从研究中获得的基本知识和理解预计将有助于提高先进器件和电路的性能，为设计和生产改进的材料和材料组合提供基本的理解和基础。该计划的一个重要特点是强调教育，并通过培养学生在一个根本性和技术上重要的研究领域的研究和教育的整合。＊＊＊

9701581 Suzuki This CAREER project addresses the role of structural distortions in magnetic properties of ferromagnetic perovskite materials. A major objective is to correlate structural distortions with magnetic properties to shed light on the origin of anomalously large magnetoresistance effects. Effects of lattice strain of cubic perovskite ferromagnets in thin films grown on prudently oriented substrates, in particular piezoelectrics, will be studied. In thin film samples on piezoelectric substrates, strain can be applied to the sample externally by applying a voltage to the substrate. These studies aim to elucidate the effect of structural distortion on the magnetic properties, including magnetoresistive response and Curie temperature, and thus identify appropriate theoretical interpretations. Conversely the effect of varying the strength of the magnetic interactions on the structural and magnetic properties will be studied in related layered ferromagnetic perovskites that have only recently been isolated in bulk and in heterostructures of ferromagnetic and paramagnetic cubic perovskites. This series of thin film samples is expected to uniquely allow systematic tuning of structural and magnetic properties. An education program in which the magnetics research is integrated into undergraduate and graduate experiences will be developed. This includes a course on magnetics for advanced undergraduates and graduate students, and advanced magnetics lab course and undergraduate internships in the PI's lab. The aim is to provide a firm foundation in materials science, condensed matter physics and solid state chemistry, and especially to develop students' experimental and analytical skills. %%% The project addresses forefront 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 important aspects of magnetic materials and devices, in general. Additionally, the fundamenta l knowledge and understanding gained from the research is expected to contribute 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 emphasis on education, and on the integration of research and education through the training of students in a fundamentally and technologically significant research area. ***