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: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=521358
• 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.

当前对具有纳米或亚微米范围内的一维或多维的磁性材料的基本过程的研究是由其在新型磁存储器、超快开关和高技术应用领域的巨大潜力所驱动的。 -频率设备。再加上生长和制造技术的最新进展，可以可靠地生产由磁性元件及其阵列组成的各种纳米结构。因此，在理论方面，迫切需要从根本上了解这些材料在这些小长度尺度上发生的动态过程，以便设计和增强设备和应用的性能，并预测新的影响。这为拟议的理论研究计划提供了主要目标和重点。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）进行，并应用于材料中的集体激发或波，例如自旋波（或磁振子），有时与振动波一起应用（或声子）和电子激发。由于这些波的空间量子化被限制在有限的材料中以及由于多个表面和界面的存在，预计会出现新的效应。众所周知，纳米结构材料有时可能表现出其本体材料所不具备的新颖特性，例如巨磁阻现象，并且可以用作新技术的基础。这为该领域的研究提供了另一个动力。