High Anisotropy Magnetic Nanoparticles and Nanocomposites

该材料合成和加工项目的重点是下一代磁性材料。 最重要的是高各向异性CoPt和FePt纳米颗粒的制备和表征。 这些粒子将通过一个配备有特殊热处理阶段的“集束枪”装置来制备，这需要将它们的结构从fcc相转变为高各向异性的fct相。 特别准备的基板也将被用来组装这些纳米级颗粒成有序阵列。 这些粒子及其阵列的性质将作为高密度磁记录的候选介质进行研究。 该项目将提供一名博士后，在磁性和材料科学方面进行尖端培训和教育。 该项目由金属计划和凝聚态物理计划共同资助。该材料合成和加工项目的重点是下一代磁性材料。 随着磁性颗粒的尺寸不断减小到纳米范围，它变得容易受到温度效应的影响，这可能导致其磁化强度在不同方向上波动。 在粒子的磁化方向上不再可能“存储”信息。 这些问题是硬盘驱动器上存储信息密度的最重要限制之一。 这项研究的目的是开发记录介质，将功能在室温下，而使用的颗粒大小低于百万分之一英寸。 所述材料是钴、铂和铁的合金或化合物。 该项目将提供一名博士后，在磁性和材料科学方面进行尖端培训和教育。 该项目由金属计划和凝聚态物理计划共同资助。

This material synthesis and processing project is focused on next generation magnetic materials. Of primary importance is the preparation and characterization of high anisotropy CoPt and FePt nanoparticles. The particles will be prepared by a "cluster gun" assembly equipped with a special heat-treating stage, required to transform their structure from the fcc phase to the high anisotropy fct phase. Specially prepared substrates will also be used to assemble these nanoscale particles into ordered arrays. The properties of the particles and their arrays will be investigated as candidate media for high-density magnetic recording. The project will provide one post-doctoral associate with cutting edge training and education in magnetism and materials science. The project is co-funded between the Metals Program and the Condensed Matter Physics Program.This material synthesis and processing project is focused on next generation magnetic materials. As a magnetic particle is continually reduced in size to the nanometer regime, it becomes susceptible to temperature effects that can cause its magnetization to fluctuate in different directions. It is no longer possible to "store" information in the particle's magnetization orientation. These issues are among the most important limits to how dense information can be stored on hard disk drives. The objective of this research is to develop recording media that will function at room temperature while using particles of sizes below one millionth of an inch. The materials are alloys or compounds of cobalt, platinum and iron. The project will provide one post-doctoral associate with cutting edge training and education in magnetism and materials science. The project is co-funded between the Metals Program and the Condensed Matter Physics Program.