Dynamical processes in nanostructured and low-dimensional magnetic materials

纳米结构和低维磁性材料的动力学过程

• 批准号: 36357-2012
• 负责人: Cottam, Michael
• 金额: $ 1.82万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=507365
• 关键词: Dynamical; processes; nanostructured; low; dimensional

The current research into fundamental processes in magnetic materials that have one or more dimensions in the nanometer or submicron ranges is being driven by their immense potential for technological applications in the areas (for example) of new types of magnetic memory, ultrafast switching, and high-frequency devices. This is coupled with recent advances in growth and fabrication techniques that allow a wide variety of nanostructures composed of magnetic elements and their arrays to be reliably produced. Consequently, on the theoretical side there is a pressing need to understand at a fundamental level the dynamical processes taking place within such materials on these small length scales in order to engineer and enhance the properties of the devices and applications, as well as to predict new effects. This provides the primary objective and focus for this proposed program of theoretical research. The calculations will be carried out by using different quantum-mechanical techniques, often in conjunction with numerical simulation methods, and applied to the collective excitations or waves in the materials, e.g., the spin waves (or magnons), sometimes together with the vibrational waves (or phonons) and electronic excitations. Novel effects are expected to arise due to the spatial quantization of these waves confined in the finite materials and due to the presence of multiple surfaces and interfaces. It is known that nanostructured materials may sometimes display novel characteristics that are absent in their bulk constituent materials, as in the phenomenon of giant magnetoresistance for example, and can be utilized as the basis for new technologies. This provides another motivation for this field of research.

当前对磁性材料中具有一个或多个尺寸的基本过程的研究是由它们在新型磁性记忆，超快切换和高频设备的区域中（例如）在该区域（例如）在该领域（例如）在技术应用中的巨大潜力所驱动的。这是最新的生长和制造技术进步，这些技术允许多种由磁元素组成的纳米结构及其阵列可靠地产生。因此，在理论方面，需要在基本层面上理解这些材料中在这些小长度尺度上发生的动力学过程，以设计和增强设备和应用程序的特性，并预测新的效果。这为这项拟议的理论研究计划提供了主要目标和重点。该计算将通过使用不同的量子力学技术（通常与数值模拟方法结合在一起）进行，并应用于材料中的集体激发或波浪中，例如旋转波（或镁），有时以及振动波（或声音）（或声音）和电子激发。由于对有限材料中的这些波的空间量化以及由于存在多个表面和界面的存在，因此有望产生新的效果。众所周知，纳米结构的材料有时可能显示出大量成分材料中没有的新型特征，例如，在巨型磁场的现象中，可以用作新技术的基础。这为这一研究领域提供了另一个动机。