Development of a Cluster-Deposition System for Nanoscale Magnetic Materials Research and Education

用于纳米磁性材料研究和教育的簇沉积系统的开发

• 批准号: 9975909
• 负责人: David Sellmyer
• 金额: $ 12万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2003-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9975909&HistoricalAwards=false
• 关键词: Development; Cluster; Deposition; System; Nanoscale

9975909SellmyerThis grant will provide partial support for the development of a new cluster-deposition facility for the synthesis of a variety of magnetic nanostructures. The facility will be capable of producing nearly monodispersed clusters with mean sizes ranging from 200 to 15,000 atoms, and to deposit these clusters onto a substrate alone or in combination with different elements or alloys. The resulting films are expected to have nanostructures of different types including homogeneous amorphous or crystalline alloys or compounds, multilayers, and mesoscopic nanocomposites. The sizes of the clusters and their concentration can be varied over wide ranges, and the matrix materials of the nanocomposites can be chosen independently. The clusters themselves may have properties significantly different from bulk materials of the same composition. This allows excellent control of the properties of the films through those of the clusters and their interactions.The potential impact of these magnetic nanostructures on materials research and magnetictechnologies is significant. The production of independent or weakly interacting superparamagnetic particles is possible, thus paving the way for basic studies including spin-glass-like phase transitions. Novel nanoparticulate, high-anisotropy and high-coercivity films will be made with high potential to increase the areal density of magnetic-recording media by a factor of ten. New types of structures for the study of tunnel magnetoresistance and Coulomb blockade will be possible. There is an excellent chance that model exchange-coupled hard-soft permanent magnets will be achievable with world-record energy products.The new cluster-deposition system will simultaneously benefit the research and education of a large group of graduate and undergraduate students, as well as several postdoctoral research associates. The University of Nebraska has a large and diverse experimental and theoretical group in nanostructured magnetic materials that heretofore have been prepared by other techniques. The combination of this group and expertise in cluster-deposition instrumentation can be expected to significantly advance the field of nanomagnetism and its applications.%%%This is an ideal "integration of research and education" enterprise. It is expected it will have significant

这笔拨款将为用于合成各种磁性纳米结构的新型团簇沉积设备的开发提供部分支持。该设施将能够生产平均大小为200到15,000个原子的几乎单分散的团簇，并将这些团簇单独或与不同元素或合金结合在一起沉积在衬底上。所得到的薄膜有望具有不同类型的纳米结构，包括均匀的非晶或结晶合金或化合物、多层和介观纳米复合材料。簇的大小和浓度可以在很大的范围内变化，纳米复合材料的基体材料可以独立选择。团簇本身可能具有与相同组成的块状材料显著不同的性质。这使得通过这些簇和它们的相互作用，可以很好地控制薄膜的特性。这些磁性纳米结构对材料研究和磁性技术的潜在影响是显著的。产生独立或弱相互作用的超顺磁粒子是可能的，从而为包括自旋玻璃相变在内的基础研究铺平了道路。新型的纳米颗粒、高各向异性和高矫顽力薄膜将被制成具有高潜力的高磁记录介质的面密度增加十倍。研究隧道磁阻和库仑阻塞的新型结构将成为可能。有一个极好的机会，模型交换耦合硬-软永磁体将实现世界纪录的能源产品。新的集群沉积系统将同时有利于一大批研究生和本科生以及一些博士后研究人员的研究和教育。内布拉斯加州大学在纳米结构磁性材料方面拥有庞大而多样的实验和理论团队，迄今为止这些材料都是通过其他技术制备的。这个小组和团簇沉积仪器的专业知识的结合可以预期大大推进纳米磁学领域及其应用。这是一家理想的“科研与教育一体化”企业。预计它将产生重大影响