A Structural Study of Strain Effects in Manganite Films

锰酸盐薄膜应变效应的结构研究

• 批准号: 0209243
• 负责人: Trevor Tyson
• 金额: $ 27万
• 依托单位: New Jersey Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0209243&HistoricalAwards=false
• 关键词: Structural; Study; Strain; Effects; Manganite

This individual investigator award will support a project with the goal of providing insight into the intimate coupling of electron spin, electron transport and atomic structure in the manganite system, possibly leading to the development of more accurate models of systems with strong electron-lattice correlations. The long-range, nanoscale and local atomic structure will be determined in films ranging from the nanoscale to bulk-like to explore how magnetic and transport properties are influenced by substrate strain and film thickness. The structure will be determined via a variety of techniques including, x-ray diffraction, atomic force microscopy, and x-ray absorption spectroscopy. Direct comparisons will be made with corresponding bulk materials and correlations of the structure with resistivity and magnetization measurements will be performed. These materials may be of use in future magnetic read-head technologies. Graduate and undergraduate students will be involved in all levels of this work. To develop scientific literacy in students, a seven week summer research and teaching program on transition metal oxide preparation and characterization designed for Newark area high school students and teachers will be conducted during each year of this grant.The manganite system is a class of materials that exhibit large changes in resistivity with applied magnetic field. These changes are an order of magnitude larger than those in sensors currently used in computer hard drives and may enable significantly higher storage capacity. However, the sensitivity at low magnetic fields required for use in hard drives must be improved. From the basic scientific perspective, these materials provide an important testing ground for systems with large correlations between atomic structure and electron transport. This individual investigator award will support a study of a broad range of films relevant to both technological applications and basic science understanding. The goal is to understand how magnetic properties are influenced by substrate strain and film thickness. Graduate and undergraduate students will be involved in all levels of this work. A seven-week summer research and teaching program on transition metal oxide preparation and characterization, designed for Newark area high school students and teachers will be conducted during each year of this grant. This will serve to develop scientific literacy and may influence students to pursue careers in science.

该个人研究者奖将支持一个项目，其目标是深入了解锰氧化物系统中电子自旋，电子传输和原子结构的紧密耦合，可能导致开发具有强电子晶格相关性的系统的更精确模型。 远程，纳米级和本地原子结构将被确定在膜范围从纳米级到散装，以探索如何磁性和输运性质的影响基板应变和膜厚度。 将通过各种技术确定结构，包括X射线衍射、原子力显微镜和X射线吸收光谱。 直接比较将与相应的散装材料和电阻率和磁化测量的结构的相关性将被执行。 这些材料可能在未来的磁读头技术中使用。 研究生和本科生将参与这项工作的各个层面。 为了培养学生的科学素养，每年在该资助期间，将针对纽瓦克地区高中学生和教师开展为期七周的过渡金属氧化物制备和表征夏季研究和教学项目。锰氧化物系统是一类随着施加磁场而表现出较大电阻率变化的材料。 这些变化比目前计算机硬盘驱动器中使用的传感器大一个数量级，并且可以实现显着更高的存储容量。 然而，必须提高在硬盘驱动器中使用所需的低磁场下的灵敏度。 从基础科学的角度来看，这些材料为原子结构和电子输运之间具有很大相关性的系统提供了重要的测试基础。 这个个人研究者奖将支持一个广泛的电影相关的技术应用和基础科学的理解的研究。 目的是了解磁性是如何受到衬底应变和薄膜厚度的影响。 研究生和本科生将参与这项工作的各个层面。 为期七周的夏季研究和教学计划过渡金属氧化物的制备和表征，专为纽瓦克地区的高中学生和教师将在每年的补助金进行。 这将有助于培养科学素养，并可能影响学生从事科学事业。