Investigation of Low Dimensional Magnetic Nanostructures

这项凝聚态物理研究将对磁性纳米结构中的自旋电荷相关有一个基本的了解。通过研究动量空间中依赖自旋的电子约束来探讨降维的影响。磁性相互作用的影响将在多层中进行研究，其中层间耦合调节物理性质，如磁相变，自旋重定向转变等。二维薄膜的横向调制将在相邻表面上进行研究。一种新的球形衬底技术将被用于系统地控制阶跃取向和阶跃密度。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。纳米结构的电子特性将通过角分辨光电发射光谱（ARPES）来表征，薄膜的磁性特性将通过光电发射电子显微镜（PEEM）和表面磁光克尔效应（SMOKE）技术来确定。研究生将接受尖端实验技术的培训，这将为他们在学术界、工业界和政府的职业生涯做好准备。当材料的尺寸缩小到纳米尺度时，电子的电荷和自旋可以一致地产生独特的磁电子特性，这对未来的信息技术非常重要。本提案的目标是在基础层面上对纳米结构中的自旋-电荷相关有更深入的了解。为了实现这一目标，磁性纳米结构将由分子束外延（MBE）制造，并由原子层控制结构。它们将使用最先进的技术进行表征，包括角度分辨光发射光谱（ARPES）、光电电子显微镜（PEEM）、扫描隧道显微镜（STM）和表面磁光克尔效应（SMOKE）等。该项目的成功不仅对低维磁学的认识，而且对磁学技术的发展具有重要意义。参与该项目的研究生将接受基础实验技术和前沿技术的培训。这种培训将为他们在学术界和工业界的一系列职业生涯做好准备。

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.