NIRT: Nanoscale Magnetic Microscopy with Multi-Photon Absorption Polymers and Y-Junction Nanotubes

NIRT：采用多光子吸收聚合物和 Y 形结纳米管的纳米级磁显微镜

• 批准号: 0210533
• 负责人: Michael Naughton
• 金额: $ 105万
• 依托单位: Boston College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2007-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0210533&HistoricalAwards=false
• 关键词: NIRT; Nanoscale; Magnetic; Microscopy; Multi

This proposal was received in response to Nanoscale Science and Engineering initiative, NSF 01-157, category NIRT. It focuses on innovative approaches to nanoscale subsurface spin imaging, including three MRFM (magnetic resonance force microscopy) schemes and one novel non-mechanical spin sensing scheme using giant magnetoresistance (GMR) detection. A research team composed of a condensed matter physicist, a physical chemist, a materials scientist and a theoretical physicist will design and develop nanoscale probes for MRFM as well as MFM (magnetic force microcopy). Carbon nanotube and multi-photon absorption (MPA) fabricated polymer cantilevers, in linear and various forked geometries, will be employed for piezoresistive, optical waveguide and RF impedance detection of specimen spins, with anticipated sensitivities to the single spin level. Novel attogram-sized ferromagnetic nanorods will be synthesized and attached to the cantilevers for use as gradient generators/spin probes. In addition to individual magnetic spin sensors, arrays of MRFM sensors will be made, with each sensor having an integrated three-dimensional radio frequency microcoil fabricated via MPA, facilitating spatial and temporal spin correlation measurements toward nanoscale functional MRI. There is much to be gained by advancing spin-detection technology toward the single-spin level, with potential applications in information technology, medicine and scientific exploration. MRFM, which is developing into a most highly sensitive measurement technique, stands to play a major role in this goal. Molecular-scale devices, such as carbon and other types of nanotubes, will play an increasingly important role as well. To reach this goal, several impediments must be obviated, such as thermal noise, the spectral function of which defines a set of parameters to be optimized in the quest for single spin detection, 3-D molecular imaging, dynamic visualization and beyond. Another impediment is the traditional optical detection using visible light, the wavelength of which is larger than the required physical dimensions of the resonating magnetic sensor. The approaches of this program are designed to overcome these obstacles. In addition to the four senior personnel, this interdisciplinary research program will involve numerous graduate students, undergraduates, and select high school students during summer months, covering a broad range of topics such as nanoscale magnetometry, micro and nanofabrication, carbon nanotube synthesis, multi-photon absorption, nanomagnet synthesis, and theoretical aspects of magnetism, nanotubes and semiconductors.

该提案是为了响应纳米科学与工程倡议、NSF 01-157、NIRT 类别而收到的。它专注于纳米级地下自旋成像的创新方法，包括三种 MRFM（磁共振力显微镜）方案和一种使用巨磁阻（GMR）检测的新型非机械自旋传感方案。由凝聚态物理学家、物理化学家、材料科学家和理论物理学家组成的研究团队将设计和开发用于 MRFM 和 MFM（磁力显微镜）的纳米级探针。 碳纳米管和多光子吸收（MPA）制造的线性和各种叉形几何形状的聚合物悬臂将用于样品自旋的压阻、光波导和射频阻抗检测，并具有对单自旋水平的预期灵敏度。 新型阿克大小的铁磁纳米棒将被合成并附着在悬臂上，用作梯度发生器/自旋探针。除了单独的磁性自旋传感器之外，还将制作 MRFM 传感器阵列，每个传感器都具有通过 MPA 制造的集成三维射频微线圈，促进纳米级功能 MRI 的空间和时间自旋相关测量。 将自旋检测技术提升到单自旋水平可以带来很多好处，并在信息技术、医学和科学探索方面具有潜在的应用前景。 MRFM 正在发展成为一种灵敏度最高的测量技术，它将在这一目标中发挥重要作用。 分子级器件，例如碳和其他类型的纳米管，也将发挥越来越重要的作用。 为了实现这一目标，必须消除一些障碍，例如热噪声，其光谱函数定义了一组需要优化的参数，以实现单自旋检测、3D 分子成像、动态可视化等。 另一个障碍是使用可见光的传统光学检测，其波长大于谐振磁传感器所需的物理尺寸。 该计划的方法旨在克服这些障碍。 除了四名高级人员外，这个跨学科研究项目还将在暑假期间吸引众多研究生、本科生和部分高中生，涵盖广泛的主题，例如纳米级磁力测量、微米和纳米制造、碳纳米管合成、多光子吸收、纳米磁体合成以及磁性、纳米管和磁学的理论方面。 半导体。