CAREER: Nonlinear Optical Studies of Spin and Magnetization Dynamics in Ferromagnetic Multilayers

职业：铁磁多层中自旋和磁化动力学的非线性光学研究

• 批准号: 0094225
• 负责人: Anne Reilly
• 金额: $ 45万
• 依托单位: College of William and Mary
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2007-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0094225&HistoricalAwards=false
• 关键词: CAREER; Nonlinear; Optical; Studies; Spin

This Faculty Early Career Development (CAREER) project seeks to enhance research and education in the areas of modern optics and condensed matter physics at the College of William and Mary. The objective in research is to apply the newest techniques in ultrafast pump-probe laser spectroscopy, including frequency-dependent and time-resolved magneto-optical Kerr effect and magnetization-induced second harmonic generation, to answer questions regarding spin polarization and spin and magnetization dynamics in ferromagnetic thin film multilayers. Such multilayers are showing great promise in technological applications, but are limited by incomplete knowledge of electron spin lifetimes and the sources of spin scattering and spin-flipping. Systems to be explored include magnetic multilayers displaying giant magnetoresistance, half-metallic materials and metal/semiconducting systems. This work will continue to develop non-destructive, fast and straightforward nonlinear optical techniques to measure parameters crucial for spin-based devices. The educational goal of this project is the development of a series of laboratory modules which will be used to introduce modern optics and the physics of materials to undergraduates at the College as well as be used in outreach programs to the local community.%%%This Faculty Early Career Development (CAREER) project seeks to enhance research and education in the areas of modern optics and the physics of materials at the College of William and Mary. In research, ultrafast pulsed laser techniques (with laser pulses less than one-trillionth of a second in duration), will be used to measure how the magnetic properties of thin-film ferromagnetic multilayers evolve in time. In these techniques, a "pump" beam is used to excite the material under study while a second pulsed beam "probes" or takes a snapshot of the state of the system later in time. Such techniques have been successfully used, for example, to study chemical reactions as they occur, and have only recently been applied to magnetic materials. The study of the ultimate speed of magnetic processes and what determines the magnetic and electrical properties of magnetic thin films is extremely important for the design of electronic and magnetic devices such as hard drive read heads, nonvolatile computer memory and the next generation computer devices based on electron spin (dubbed "Spintronics" or Magnetoelectronics"). The educational goal of this project is the development of a series of hands-on laboratory modules which will be used to introduce modern optics and the physics of materials to undergraduates at the College as well as be used in outreach programs to the local community.***

这个教师早期职业发展（Career）项目旨在加强威廉玛丽学院现代光学和凝聚态物理领域的研究和教育。研究的目的是应用超快泵浦探测激光光谱学的最新技术，包括频率相关和时间分辨磁光克尔效应和磁化诱导二次谐波的产生，来回答铁磁薄膜多层中的自旋极化和自旋和磁化动力学问题。这种多层材料在技术应用方面显示出巨大的前景，但由于对电子自旋寿命以及自旋散射和自旋翻转来源的不完全了解而受到限制。探索的系统包括显示巨磁阻的磁性多层材料、半金属材料和金属/半导体系统。这项工作将继续发展非破坏性、快速和直接的非线性光学技术来测量自旋基器件的关键参数。该项目的教育目标是开发一系列的实验模块，这些模块将用于向学院的本科生介绍现代光学和材料物理学，并用于向当地社区推广的项目。这个教师早期职业发展（Career）项目旨在加强威廉玛丽学院在现代光学和材料物理学领域的研究和教育。在研究中，超快脉冲激光技术（激光脉冲持续时间小于万亿分之一秒）将用于测量薄膜铁磁多层膜的磁性如何随时间演变。在这些技术中，一个“泵浦”光束被用来激发所研究的材料，而另一个脉冲光束“探测”或拍摄系统稍后状态的快照。例如，这些技术已经成功地用于研究化学反应的发生，但直到最近才被应用于磁性材料。研究磁性过程的最终速度以及决定磁性薄膜的磁性和电学性能的因素对于电子和磁性设备的设计非常重要，例如硬盘驱动器读磁头，非易失性计算机存储器和基于电子自旋的下一代计算机设备（称为“自旋电子学”或“磁电子学”）。该项目的教育目标是开发一系列动手实验模块，这些模块将用于向学院的本科生介绍现代光学和材料物理学，并用于当地社区的推广项目