Magnetism at the Nanoscale

纳米尺度的磁性

• 批准号: 3892-2013
• 负责人: Southern, Byron
• 金额: $ 1.31万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633570
• 关键词: Magnetism; Nanoscale

The study of magnetism in confined geometries has produced much new science and many technicalapplications over the past thirty years and will continue to be a rewarding area of research yielding applications in the foreseeable future. Confined systems that exhibit novel properties often consist of dissimilar materials that include at least one or more magnetic component. A fundamental understanding of nanomagnetism will lead to the development of integrated systems with complex structures and architectures that possess new functionalities. Controlled release of drugs from nanostructured functional materials, especially nanoparticles, is attracting increasing attention because of the opportunities in cancer therapy and the treatment of other ailments. The potential of magnetic nanoparticles stems from the intrinsic properties of their magnetic cores combined with their drug loading capability and the biochemical properties that can be bestowed on them by means of a suitable coating.Magnetic properties at interfaces and surfaces, which make up a large fraction of nanostructured and confined materials, can be qualitatively different from those of bulk systems. Fundamental to understanding these differences is understanding the evolution of the magnetism as the structural scale descends from the bulk to the nanoscale. Due to reduced symmetry, the magnetic anisotropy at a surface or interface can be orders of magnitude larger than in the bulk. This result can lead to magnetic frustration and reorientation of the magnetization at the surface and interface. My research program will develop and use high performance computing tools to investigate the complex atomic spin structure of magnetic nanostructures. My work will advance our understanding of magnetic interactions in nanoparticles and enable new technologies. A fundamental understanding of nanomagnetism will play an increasing role in our lives and impact many areas of Canadian society.

在过去的三十年里，受限几何中的磁性研究产生了许多新的科学和技术应用，并将在可预见的未来继续成为一个有价值的研究领域并产生应用。表现出新特性的受限系统通常由包括至少一个或多个磁性组件的不同材料组成。对纳米磁学的基本理解将导致具有复杂结构和体系结构的集成系统的发展，这些系统具有新的功能。纳米结构功能材料的药物控制释放，特别是纳米粒子，由于在癌症治疗和其他疾病治疗中的机会而引起越来越多的关注。磁性纳米粒子的潜力来自于其磁核的固有性质，以及它们的载药能力和通过合适的涂层可以赋予它们的生化性质。界面和表面的磁性在纳米结构和受限材料中占很大比例，可能与块体系统的磁性有本质上的不同。理解这些差异的基础是理解当结构尺度从块状下降到纳米尺度时磁性的演变。由于对称性降低，表面或界面处的磁各向异性可能比块体中的大几个数量级。这一结果可能导致表面和界面上的磁化受挫和磁化方向的重新定向。我的研究计划将开发和使用高性能计算工具来研究磁性纳米结构的复杂原子自旋结构。我的工作将促进我们对纳米颗粒中磁性相互作用的理解，并使新技术成为可能。对纳米磁学的基本了解将在我们的生活中发挥越来越大的作用，并影响加拿大社会的许多领域。