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：磁性材料用于非凡的应用范围 - 从硬盘系统中的磁性记忆到与卫星的高频通信到雷达系统。 这些应用中的许多应用都取决于磁化强度可以从一个方向变为另一个方向并稳定在这个新方向上的速度。 该项目探讨了稳定磁化并调整磁化速度可以改变的速度的新方法。 该项目的结果可能会导致现有应用的实质性改善，并更好地了解磁性材料。 该项目还整合了研究和教育，以便在高频研究中需要培训学生（研究生，本科和高中）。 获得的技能，包括材料的增长和特征，将有助于学生为学术界，国家实验室和行业的职业做好准备。 主要工具之一，铁磁共振（FMR），提供了有关单个膜或耦合膜的重要磁参数（各向异性，有效磁化等）的信息。 FMR还给出了对放松研究至关重要的吸收系的宽度。 这项工作将调查四个相关的项目：1）Fe和Py的散装和表面掺杂，并具有控制阻尼的杂质； 2）探索Fe/Cu多层中阻尼的急剧降低； 3）使用网络分析仪技术来阐明两麦克农散射的作用和4）在Fe和混合价磁性材料之间阻尼和交换耦合。 从更广泛的角度来看，该研究将有助于理解高频的磁化动力学。 此类信息对于提高磁性记忆的写作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。该项目还整合了研究和教育，以便在高频研究中需要培训学生（研究生，本科和高中）。