RUI: Relaxation in Magnetic Structures

RUI：磁结构的弛豫

• 批准号: 0605629
• 负责人: Zbigniew Celinski
• 金额: $ 31万
• 依托单位: University of Colorado at Colorado Springs
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-15 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0605629&HistoricalAwards=false
• 关键词: RUI; Relaxation; Magnetic; Structures

Non-Technical: Magnetic materials are used in an extraordinary range of applications - from magnetic memories in hard disk systems to high frequency communications with satellites to radar systems. Many of these applications depend critically on how fast the magnetization may be changed from one direction to another and stabilized in this new direction. This project explores new ways of stabilizing the magnetization and adjusting how fast the magnetization can change. The results of this project can lead to substantial improvements in existing applications and to a better understanding of magnetic materials. This project also integrates research and education in order to train students (graduate, undergraduate and high school) in modern methods required in high frequency studies. The acquired skills, which include material growth and characterization will help prepare the students for careers in academe, national laboratories, and industry.Technical:This project will study fundamental aspects of magnetic damping in several magnetic systems. One of the primary tools, ferromagnetic resonance (FMR), provides information about the important magnetic parameters (anisotropies, effective magnetization, etc) of an individual film or coupled films. FMR also gives the width of the absorption line that is of paramount importance for relaxation studies. This work will investigate four related projects: 1) Bulk and surface doping of Fe and Py with impurities to control damping; 2) Exploration of the dramatic lowering of the damping in Fe/Cu multilayers; 3) The use of Network Analyzer techniques to clarify the role of two-magnon scattering and 4) Damping and exchange coupling between Fe and mixed valence magnetic materials. From a broader perspective, the research will aid in understanding magnetic dynamics at high frequencies. Such information is central to improving the speed of writing in magnetic memories and to high frequency signal processing used in radar and satellite communications. This project also integrates research and education in order to train students (graduate, undergraduate and high school) in modern methods required in high frequency studies.

非技术：磁性材料的应用范围非常广泛-从硬盘系统中的磁性存储器到与卫星的高频通信再到雷达系统。 这些应用中的许多关键取决于磁化从一个方向改变到另一个方向并在这个新方向上稳定的速度。 该项目探索了稳定磁化和调整磁化变化速度的新方法。 该项目的结果可以导致现有应用的实质性改进，并更好地了解磁性材料。 该项目还将研究和教育结合起来，以培训学生（研究生、本科生和高中生）掌握高频研究所需的现代方法。 所获得的技能，其中包括材料生长和表征将帮助学生在工业，国家实验室和工业的职业生涯做好准备。技术：本项目将研究几个磁系统中磁阻尼的基本方面。 铁磁共振（FMR）是一种主要的工具，它提供了关于单个薄膜或耦合薄膜的重要磁参数（各向异性、有效磁化等）的信息。FMR还给出了对弛豫研究至关重要的吸收线的宽度。 这项工作将调查四个相关的项目：1）体和表面掺杂的Fe和Py的杂质，以控制阻尼; 2）探索显着降低阻尼的Fe/Cu多层膜; 3）使用网络分析仪技术，以澄清的作用，两个磁振子散射和4）阻尼和交换耦合之间的Fe和混合价磁性材料。 从更广泛的角度来看，这项研究将有助于理解高频下的磁动力学。 这些信息对于提高磁存储器的写入速度以及雷达和卫星通信中使用的高频信号处理至关重要。该项目还将研究和教育结合起来，以便培训学生（研究生、本科生和高中生）掌握高频研究所需的现代方法。