MWN: Magnetization Dynamics in Metallic Ferromagnetic Nanostructures

技术概述：本材料世界网络项目的目标是研究自旋霍尔效应产生的纯自旋电流存在下金属铁磁纳米结构中自旋波的光谱特性。在这些研究中，将进行一系列利用片上铁磁共振和近场布里渊光散射的实验。这些测量将侧重于理解几何约束对非线性自旋波相互作用的影响，以及自旋波电流对铁磁纳米线中自旋波色散和阻尼的影响。这些现象将从实验和理论两方面进行研究，研究项目将促进美国（加州大学欧文分校）和德国（杜伊斯堡-埃森大学和明斯特大学）学术机构之间的国际合作和学生交流。通过该项目获得的对纯自旋电流对自旋波的影响的基本理解将有助于新兴磁振学领域的创新-一种基于自旋的节能信息处理。该项目将使一些高中生、本科生和研究生接触纳米科学，并将为美国电子和磁记录行业培养专家。非技术总结：当磁性材料的尺寸缩小到百万分之几毫米时，它就获得了新的科学上有趣的和技术上重要的特性。例如，这些材料中常见的电流可以产生垂直于电流的纯磁流。此外，这种材料中的电磁波可以用来传输和处理信息，就像我们熟悉的计算机和手机中携带信息的电信号一样。与电信号相比，电磁波的主要优点是与电路中的电子能量相比，它们的能量较低。因此，使用电磁波携带信息和纯磁流处理信息的电路应该提供移动电子设备所需的显著节能。这个材料世界网络项目的目的是了解纯磁流如何与电磁波相互作用，并找到用纯磁流操纵电磁波的节能方法。这项研究将促进我们对磁性的基本理解，并将使节能磁路的发展成为可能。该项目将使一些高中生、本科生和研究生接触纳米科学，并将为美国电子和磁记录行业培养专家。该研究项目还将促进美国（加州大学欧文分校）和德国（杜伊斯堡-埃森大学和明斯特大学）学术机构之间的国际合作和学生交流。本项目由凝聚态物理项目和材料研究部特别项目办公室支持。

TECHNICAL SUMMARY:The goal of this Materials World Network project is to study spectral properties of spin waves in metallic ferromagnetic nanostructures in the presence of pure spin currents from spin Hall effect. For these studies, a series of experiments that employ on-chip ferromagnetic resonance and near-field Brillouin light scattering will be carried out. These measurements will focus on understanding of the effect of geometric confinement on nonlinear spin wave interactions and the effect of spin currents on spin wave dispersion and damping in ferromagnetic nanowires. These phenomena will be studied both experimentally and theoretically, and the research program will foster international collaboration and student exchange between US (UC Irvine) and German (University of Duisburg-Essen and University of Muenster) academic institutions. The fundamental understanding of the effect of pure spin currents on spin waves gained through this program will contribute to innovation in the emerging field of magnonics - a spin based energy efficient processing of information. This project will expose a number of high-school, undergraduate and graduate students to nanoscience and will prepare specialists for the US electronics and magnetic recording industries. NON-TECHNICAL SUMMARY:When the size of a magnetic material is reduced down to a few millionths of a millimeter, it acquires new scientifically interesting and technologically important properties. For example, familiar electric currents in such materials can create pure magnetic currents that flow perpendicular to the electric currents. Furthermore, magnetic waves in such materials can be used for transmitting and processing information in analogy to the familiar electric signals that carry information in computers and cell phones. The main advantage of the magnetic waves over the electric signals is their low energy compared to the energy of electrons in electric circuits. Thus, circuits that use magnetic waves to carry information and pure magnetic currents to process information should offer significant energy savings desired in mobile electronic devices. The purpose of this Materials World Network project is to understand how pure magnetic currents interact with magnetic waves and to find energy-efficient ways to manipulate magnetic waves with pure magnetic currents. This research will advance our fundamental understanding of magnetism and will enable the development of energy-efficient magnetic circuits. This project will expose a number of high-school, undergraduate and graduate students to nanoscience and will prepare specialists for the US electronics and magnetic recording industries. This research program will also foster international collaboration and student exchange between US (UC Irvine) and German (University of Duisburg-Essen and University of Muenster) academic institutions.This project is supported by the Condensed Matter Physics program and the Office of Special Programs in the Division of Materials Research.