New magnetic nanomaterials

磁性材料在日常生活中经常使用，从可爱的冰箱磁铁到计算机和医院中最先进的磁共振成像。较小的材料是有利的，因为它们会导致更小，更快，更节能的计算机，并且在人体的所有角落和缝隙中爬行，以获得更好的诊断和有效的药物输送。 我们研究如何通过制造新的纳米材料来改善我们的日常生活，并将其与信息技术和生物医学分析中使用的当前最先进的材料进行基准测试。通过这项研究计划，我们将制备和研究具有新特性的新型磁性纳米材料，并进一步了解纳米尺度下的磁性。 在所有现代计算机中发现的自旋电子器件的性能依赖于其磁性组件的自旋极化。预计具有100%自旋极化的材料（例如Co2MZ [M= Fe、Cr、Mn，Z=Al、Si、Ge]）将有利地作为纳米结构以使器件结晶和加速。我们将设计合成途径Co2MZ纳米材料，并评估其性能作为大小，组成和形态的函数。 金是一种非磁性材料，在室温下，当以薄膜或纳米晶体（约5nm或更小）的形式用硫醇自组装单层修饰时，表现出永久磁性。我们将研究这些纳米晶体的磁性能的单分子层的尺寸，形状和化学身份的影响。特别地，追求用光致变色开关如硫醇化偶氮苯的官能化，其中光致变色的状态导致磁性质的大的改变。 为了获得单相铁磁性，发光，生物相容性纳米材料，我们将掺杂氧化铝，最近被证明是铁磁性的材料时，纳米尺度，发光镧系离子。将设计朝向镧系元素离子到主体中的受控并入的合成途径。

Magnetic materials are routinely used in daily life, from cute refrigerator magnets to computers and state-of-the art magnetic resonance imaging in hospitals. Smaller materials are advantageous, as they result in smaller, faster, and more energy efficient computers, and in the human body creep in all the nooks and crannies for better diagnostics and efficient drug delivery. We study how we can improve our daily lives by making new nanoscaled materials, and benchmarking them against current state-of-the-art materials used in information technology and biomedical analysis. Through this research program, we will prepare and study new magnetic nanomaterials with novel properties, and further our understanding of magnetism at the nanoscale. The performance of spintronic devices found in all modern computers relies on the spin polarization of their magnetic components. Materials predicted to have 100% spin polarization (eg Co2MZ [M= Fe,Cr,Mn, Z=Al,Si,Ge]), would be advantageous as nanostructures to miniaturize and speed up devices. We will design synthetic avenues to Co2MZ nanomaterials, and evaluate their properties as a function of size, composition, and morphology. Gold, a non-magnetic material in the bulk, exhibits permanent magnetism, at room temperature, when in the form of thin films or nanocrystals (~5nm or less) modified with thiol self-assembled monolayers. We will study the impact of nanocrystal size, shape, and chemical identity of the monolayer on the magnetic properties of these nanocrystals. In particular, functionalization with a photochromic switch such as a thiolated azobenzene is pursued, wherein the photochrome's state leads to large modifications of the magnetic properties. To obtain single-phase ferromagnetic, luminescent, and biocompatible nanomaterials, we will dope Al2O3, a material recently shown to be ferromagnetic when nanoscaled, with luminescent lanthanide ions. Synthetic avenues towards the controlled incorporation of the lanthanide ion into the host will be devised.