MWN: Magnetization Dynamics in Metallic Ferromagnetic Nanostructures

技术综述：这个材料世界网络项目的目标是研究金属铁磁纳米结构中自旋波的光谱特性，其中存在来自自旋霍尔效应的纯自旋流。对于这些研究，将进行一系列利用芯片上的铁磁共振和近场布里渊光散射的实验。这些测量将侧重于了解几何限制对非线性自旋波相互作用的影响，以及自旋流对铁磁纳米线中自旋波色散和衰减的影响。这些现象将从实验和理论上进行研究，该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。通过这个项目获得的对纯自旋流对自旋波影响的基本了解，将有助于在新兴的磁振子领域--一种基于自旋的能量高效信息处理--的创新。该项目将使许多高中生、本科生和研究生接触纳米科学，并为美国电子和磁记录行业培养专家。非技术摘要：当磁性材料的尺寸减小到百万分之几毫米时，它就会获得新的具有科学意义和技术重要性的特性。例如，这类材料中常见的电流可以产生与电流垂直流动的纯磁电流。此外，这种材料中的电磁波可以用来传输和处理信息，类似于计算机和手机中常见的携带信息的电信号。与电信号相比，电磁波的主要优点是它们的能量比电路中的电子能量低。因此，使用电磁波携带信息和使用纯磁流处理信息的电路应该可以提供移动电子设备所需的显著节能效果。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，并找到利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学的基本理解，并将使节能磁路的发展成为可能。该项目将使许多高中生、本科生和研究生接触纳米科学，并为美国电子和磁记录行业培养专家。该研究计划还将促进美国(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。该项目得到凝聚态物理计划和材料研究部特殊计划办公室的支持。

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.