Investigation of Low Dimensional Magnetic Nanostructures

低维磁性纳米结构的研究

• 批准号: 0405259
• 负责人: Zi Qiu
• 金额: --
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0405259&HistoricalAwards=false
• 关键词: Investigation; Low; Dimensional; Magnetic; Nanostructures

This condensed matter physics research will develop a fundamental understanding of the spin-charge correlation in magnetic nanostructures. Effects of reduced dimensionality will be explored by investigating spin-dependent electron confinement in momentum space. Effects of magnetic interaction will be investigated in multilayers where the interlayer coupling tunes physical properties such as the magnetic phase transition, the spin reorientation transition, etc. Lateral modulation of a 2D thin film will be studied on vicinal surfaces. A new spherical substrate technique will be applied to control the step orientation and step density in a systematic way. All samples will be grown by Molecular Beam Epitaxy (MBE) and characterized by Reflection High-Energy Electron Diffraction (RHEED), Low-Energy Electron Diffraction (LEED), Auger Electron Spectroscopy (AES), and Scanning Tunneling Microscopy (STM). Electronic properties of the nanostructures will be characterized via Angle Resolved Photoemission Spectroscopy (ARPES) and the magnetic properties of the films will be determined by Photoemission Electron Microscopy (PEEM) and Surface Magneto-Optic Kerr Effect (SMOKE) techniques. Graduate students will receive training in cutting edge experimental techniques that will prepare them for careers in academe, industry, and government.As the size of materials is reduced to the nanometer scale, the charge and spin of electrons can behave coherently to generate unique magneto-electronic properties that are important to the future information technologies. The goal of this proposal is to develop a deeper understanding of the spin-charge correlation in nanostructures at the fundamental level. To realize this goal, magnetic nanostructures will be fabricated by Molecular Beam Epitaxy (MBE) with atomic layer control of the structure. They will be characterized with state-of-the-art techniques, including Angle Resolved Photoemission Spectroscopy (ARPES), Photoemission Electron Microscopy (PEEM), Scanning Tunneling Microscopy (STM), and Surface Magneto-Optic Kerr Effect (SMOKE), etc. The success of this project will be important not only to the understanding of low-dimensional magnetism, but also to the development of magnetic technology. Graduate students involved in the project will receive training in fundamental experimental techniques and cutting edge technology. This training will prepare them for a range of careers in both academe and industry.

这项凝聚态物理学研究将发展对磁性纳米结构中自旋-电荷相关性的基本理解。降维的影响将通过研究动量空间中自旋相关的电子约束来探索。磁相互作用的影响将在多层膜中进行研究，其中层间耦合调谐的物理性质，如磁相变，自旋重取向过渡等。横向调制的2D薄膜将在邻位表面上进行研究。一种新的球形衬底技术将被应用到控制的步骤取向和步骤密度在一个系统的方式。所有样品将通过分子束外延（MBE）生长，并通过反射高能电子衍射（RHEED）、低能电子衍射（LEED）、俄歇电子能谱（AES）和扫描隧道显微镜（STM）进行表征。纳米结构的电子性质将通过角分辨光电子能谱（ARPES）表征，薄膜的磁性将通过光电子能谱电子显微镜（PEEM）和表面磁光克尔效应（SMOKE）技术确定。研究生将接受尖端实验技术的培训，为他们在计算机，工业和政府部门的职业生涯做好准备。随着材料的尺寸缩小到纳米尺度，电子的电荷和自旋可以一致地表现出独特的磁电特性，这对未来的信息技术非常重要。本提案的目标是在基本水平上对纳米结构中的自旋-电荷相关性有更深入的了解。为了实现这一目标，磁性纳米结构将通过分子束外延（MBE）与原子层控制的结构来制备。它们将被表征与国家的最先进的技术，包括角分辨光电子能谱（ARPES），光电子发射显微镜（PEEM），扫描隧道显微镜（STM），和表面磁光克尔效应（SMOKE）等，这个项目的成功将是重要的，不仅要了解低维磁性，而且磁性技术的发展。参与该项目的研究生将接受基础实验技术和尖端技术的培训。这项培训将为他们在企业和行业的一系列职业生涯做好准备。