Single Molecule Magnets

单分子磁铁

• 批准号: 0714488
• 负责人: David Hendrickson
• 金额: $ 47.9万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-15 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0714488&HistoricalAwards=false
• 关键词: Single; Molecule; Magnets

This award by the Inorganic, Bioinorganic, and Organomeallic (IBO) Chemistry Program supports work by Professor David N. Hendrickson at the University of California, San Diego, to advance our understanding and ability to control the quantum properties of single-molecule magnets (SMMs). The miniaturization of magnetic devices to the nanometer size using conventional fabrication techniques has serious limitations, chiefly associated with the difficulty in realizing monodisperse nanomagnets with well-defined structure, composition and characteristics. For this reason, there is a growing interest in a molecule-based approach whereby magnetic nanostructures are synthesized chemically in solution at ambient temperatures. SMMs enable fundamental studies of quantum effects associated with magnetic nanostructures that have previously been inaccessible. For instance, these molecular nanomagnets allow for the first time the study of quantum tunneling of magnetization. The magnetic moment (spin) of an individual molecular magnet changes direction from "spin up" to "spin down" by quantum tunneling, not by being thermally activated to change the direction of its magnetic moment. Research has been designed to address some of the important fundamental questions related to nanomagnetism, and to explore avenues for the implementation of SMMs in future devices. The properties of SMMs depend on many factors, e.g. spin of the ground state, shape, chemical composition, symmetry/anisotropy, and proximity to other SMMs. New SMMs are being prepared with an eye to adjusting the various factors controlling the nature of magnetization dynamics. The mechanism of magnetization tunneling is not well understood. Single-molecule magnets offer the potential for data storage on the nanoscale. Even more importantly they could serve as quantum computing devices. Collaborations involve several physics groups in three different countries and several chemistry groups. Graduate students will receive a high level training in physical methods, particularly those relating to magnetism.

该奖项由无机、生物无机和有机金属 (IBO) 化学项目颁发，支持加州大学圣地亚哥分校 David N. Hendrickson 教授的工作，以增进我们对单分子磁体 (SMM) 量子特性的理解和控制能力。 使用传统制造技术将磁性器件小型化至纳米尺寸具有严重的局限性，主要与难以实现具有明确结构、成分和特性的单分散纳米磁体有关。 因此，人们对基于分子的方法越来越感兴趣，通过这种方法在环境温度下在溶液中化学合成磁性纳米结构。 SMM 能够对与磁性纳米结构相关的量子效应进行基础研究，而这在以前是无法实现的。 例如，这些分子纳米磁体首次允许研究磁化的量子隧道。 单个分子磁体的磁矩（自旋）通过量子隧道效应从“向上自旋”变为“向下自旋”，而不是通过热激活来改变其磁矩方向。 研究旨在解决与纳米磁性相关的一些重要基本问题，并探索在未来设备中实施 SMM 的途径。 SMM 的特性取决于许多因素，例如基态自旋、形状、化学成分、对称性/各向异性以及与其他 SMM 的接近程度。 新的 SMM 正在准备中，着眼于调整控制磁化动力学性质的各种因素。 磁化隧道的机制尚不清楚。 单分子磁体提供了纳米级数据存储的潜力。 更重要的是，它们可以用作量子计算设备。 合作涉及三个不同国家的几个物理小组和几个化学小组。 研究生将接受物理方法的高水平培训，特别是与磁力相关的培训。