Dynamics in Patterned Magnetic Nanostructures: Spin-Wave Excitations and Propagation

本奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。图像化磁性纳米结构与它们的体结构相比，表现出截然不同的特性，包括改变的动态激发。该项目将探索磁性纳米结构中的磁化动力学，重点关注与磁涡流和反涡流动力学相关的现象，以及纳米磁性系统中自旋波的产生和传播。这将包括研究涡旋和反涡旋动态磁芯反转产生的自旋波爆发，以及磁性纳米线中自旋波的传播和滤波过程。结合实验和数值调查将用于探索和理解这些过程。磁性纳米结构在未来的信息存储应用、非易失性存储器和自旋电子学应用方面具有巨大的潜力，有望实现节能的信息处理。本科生和研究生的参与和培训将在这项研究中发挥至关重要的作用。学生将参与项目的各个方面，包括新实验装置的建设。该项目还将涉及与为教师和公众开发纳米科学和纳米磁学资源有关的外联部分。本奖项由2009年美国复苏与再投资法案（公法111-5）资助。将磁性材料的尺寸减小到亚微米或纳米尺寸会改变系统的能量学，并导致截然不同的磁性景观和动态激励，这对当前和未来的许多技术都很重要。随着在纳米尺度上制造和研究结构的实验能力的不断提高，有大量通过数值模型预测的现象有待探索。本项目将探索磁性纳米结构的磁化动力学。特别是，该项目将研究与磁涡流和反涡流动力学相关的现象，以及纳米磁性系统中自旋波的产生和传播。自旋波在磁性材料的有序中传播扰动。该项目将使用数值和实验相结合的调查来探索和理解这些过程。磁性纳米结构在未来的信息存储应用、非易失性存储器等方面具有巨大的潜力。计算机，以及自旋电子学的应用，也就是说，利用电子自旋而不仅仅是电荷的设备，它们有望在未来高效地处理信息。本科生和研究生的参与和培训将在这项研究中发挥至关重要的作用。学生将参与项目的各个方面，包括新实验装置的建设。该项目还将涉及与为教师和公众开发纳米科学和纳米磁学资源有关的外联部分。

Technical AbstractThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Patterned magnetic nanostructures exhibit vastly different properties compared to their bulk counterparts, including altered dynamic excitations. This project will explore magnetization dynamics in magnetic nanostructures, focusing on phenomena associated with the dynamics of magnetic vortices and antivortices, as well as, the generation and propagation of spin waves in nanopatterned magnetic systems. This will include the study of the generation of spin-wave bursts by vortex and anti-vortex dynamic core reversal and spin-wave propagation and filtering processes in magnetic nanowires. Combined experimental and numerical investigations will be used to explore and understand these processes. In additional to being of fundamental interest, magnetic nanostructures hold great potential for future information storage applications, non-volatile memory, and for spintronics applications that show promise for energy-efficient processing of information. The involvement and training of students at the undergraduate and graduate levels will play a vital role in this research. Students will participate in all aspects of the program, including the construction of new experimental set-ups. The project will also involve an outreach component related to the development of nanoscience and nanomagnetism resources for teachers and the general public.Non-Technical AbstractThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Reducing the size of a magnetic material down to sub-micrometer or nanometer dimensions changes the energetics of the system and leads to vastly different magnetic landscapes and dynamic excitations that are important for a wide range of present and future technologies. As experimental capabilities for fabricating and investigating structure on the nanoscale continue to improve, there is a wealth of phenomena predicted by numerical models waiting to be explored. This project will explore the magnetization dynamics of magnetic nanostructures. In particular, the project will examine phenomena associated with the dynamics of magnetic vortices and antivortices, as well as, the generation and propagation of spin waves in nanopatterned magnetic systems. Spin waves are propagating disturbances in the ordering of a magnetic material. The project will use combined numerical and experimental investigations to explore and understand these processes. In additional to being of fundamental interest, magnetic nanostructures hold great potential for future information storage applications, non-volatile memory for ?instant-on? computers, and for spintronics applications, that is, for devices that utilize the spin of the electron rather than just its charge, which hold promise for future energy-efficient processing of information. The involvement and training of students at the undergraduate and graduate levels will play a vital role in this research. Students will participate in all aspects of the program, including the construction of new experimental set-ups. The project will also involve an outreach component related to the development of nanoscience and nanomagnetism resources for teachers and the general public.