RUI: Nonlinear Effects in Strongly Driven Magnetic Structures

非技术摘要科罗拉多大学科罗拉多斯普林斯分校的磁学小组最近开发了一种方法，可以产生每秒振荡约100亿次的大磁场。这使得许多磁性材料可以在所谓的“非线性极限”中进行研究，在这种极限中可以找到独特和有用的行为。例如，这可以用来放大材料中的微弱电磁波，或者用来提取隐藏在噪声中的真实信号。这项工作将产生一些更广泛的影响。由于可以利用非线性运动来制作特殊的信号处理装置，因此它在实际问题中具有重要的意义。此外，非线性效应对于磁存储系统中的小磁性元件的超快开关也是重要的。此外，该项目将为各级学生--高中生、本科生、研究生和博士后研究人员--提供教育和培训。最后，科罗拉多州斯普林斯的磁学小组在让代表不足的群体参与研究方面有着出色的记录，从高中开始，这一努力将继续下去。技术摘要科罗拉多大学科罗拉多斯普林斯分校的磁学小组最近开发了一种方法，可以产生高达500 Oe的大振荡磁场，而标准铁磁共振中的典型振荡磁场为0.1 Oe。这使得研究具有大进动角的非线性磁运动成为可能。将研究三个基本问题：1)Fe和Py金属带中的非线性效应，2)Fe和Py超小元素中的非线性效应，3)非线性过程中的自旋波的谱分析。实验工作将得到理论计算的支持。这项工作将产生一些更广泛的影响。它在实际问题中具有重要的意义，因为，例如，可以使用这里研究的非线性行为来制造独特的信号处理设备，如信噪比增强器。此外，在磁存储系统中，非线性效应对小磁元件的超快开关有重要影响。此外，该项目将为各级学生--高中生、本科生、研究生和博士后研究人员--提供教育和培训。最后，科罗拉多州斯普林斯的磁学小组在让代表不足的群体参与研究方面有着出色的记录，从高中开始，这一努力将继续下去。

Non-technical AbstractThe magnetics group at the University of Colorado at Colorado Springs, a predominantly undergarduate instition, has recently developed a method which creates large magnetic fields which oscillate about 10 billion times per second. This allows the study of many magnetic materials in the so-called "nonlinear limit" where unique and useful behavior can be found. For example, this can be used to amplify weak electromagnetic waves in a material, or to pick out a real signal hidden in noise. The work will have a number of broader impacts. It has important implications in practical problems because of the special signal processing devices that can be made using nonlinear motion. Furthermore, nonlinear effects are important for ultrafast switching of small magnetic elements in magnetic memory systems. In addition, the project will provide education and training for all levels of students - high school students, undergraduates, graduate students and post-doctoral researchers. Finally, the magnetics group in Colorado Springs has an excellent record of involving underrepresented groups in research, starting at the high school level, and this effort will be continued. Technical AbstractThe magnetics group at the University of Colorado at Colorado Springs, a predominantly undergarduate instition, has recently developed a method which creates large oscillating magnetic fields, up to 500 Oe in comparison to the typical 0.1 Oe found in standard ferromagnetic resonance. This allows the study of nonlinear magnetic motion with large precession angles. Three fundamental research topics will be studied: 1) Nonlinear effects in metallic ribbons of Fe and Py, 2) Nonlinear effects in ultra-small elements of Fe and Py, and 3) Spectral analysis of the spin waves involved in nonlinear processes. The experimental effort will be supported by theoretical calculations. This work will have a number of broader impacts. It has important implications in practical problems because, for example, unique signal processing devices such as a signal to noise enhancer can be made using the nonlinear behavior studied here. Furthermore, nonlinear effects are significant for ultrafast switching of small magnetic elements in magnetic memory systems. In addition, this project will provide education and training for all levels of students - high school students, undergraduates, graduate students and post-doctoral researchers. Finally, the magnetics group in Colorado Springs has an excellent record of involving underrepresented groups in research, starting at the high school level, and this effort will be continued.