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

9975909SellmyerThis赠款将提供部分支持的发展一个新的集群沉积设施的各种磁性纳米结构的合成。该设施将能够产生平均尺寸为200至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组合存款到基底上。预期所得膜具有不同类型的纳米结构，包括均匀的无定形或结晶合金或化合物、多层和介观纳米复合材料。团簇的尺寸和浓度可以在很宽的范围内变化，并且可以独立地选择纳米复合材料的基体材料。团簇本身可能具有与相同组成的块体材料显著不同的性质。这使得通过这些团簇及其相互作用可以很好地控制薄膜的性质，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着的。独立或弱相互作用的超顺磁性粒子的产生是可能的，从而为包括自旋玻璃状相变在内的基础研究铺平了道路。 新的纳米颗粒，高各向异性和高磁性薄膜将被制成具有高潜力，以增加磁记录介质的面密度的十倍。用于隧道磁电阻和库仑阻塞研究的新型结构将成为可能。这是一个很好的机会，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研究和教育的一大群研究生和本科生，以及一些博士后研究助理。内布拉斯加大学在纳米结构磁性材料方面有一个庞大而多样化的实验和理论小组，迄今为止已经通过其他技术制备。这个小组和团簇沉积仪器的专业知识相结合，可以预期将大大推进纳米磁学及其应用领域。这是一个理想的“研教一体化”企业。 预计将有重大影响。

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