Ferromagnetic clusters on surfaces: correlation of structural, electronic and magnetic properties probed by STM and SP-STS

该项目在优先级1153中，重点是使用STM确定表面上单个团簇的结构和电子性质，这些团簇通过最高的横向分辨率实现。它们是通过产生在超高真空中沉积的尺寸选择的纳米颗粒的射流的源来制备的。高达原子尺度的极高横向分辨率允许表征单个簇，而不仅仅是像横向平均方法那样的集合。这将使得能够以高精度确定尺寸依赖性特性。准备一个“完美”的大小选择集群束允许的知识的晶格常数的体积的确定。但是，形状，从而表面体积比，显着决定电子和磁性行为的属性，往往是未知的自由集群。这种行为变得更加重要的表面上的金属簇与金属表面的相互作用的形状，电子和磁性的系统集群有显着的影响。因此，用一种方法来确定单个团簇的结构、形状和电子行为的研究对于理解团簇的性质具有重要意义。

This project within the Priority Programm 1153 focusses on the determination of structure and electronic properties of individual clusters on surfaces realized by highest lateral resolution using an STM. They are prepared by a source generating a jet of size-selected nanoparticles which are deposited in ultra-high vacuum. The extremely high lateral resolution down to the atomic scale allows a characterization of individual clusters, not only of ensembles as with laterally averaging methods. This will enable the determination of size-dependent properties with high precision. The preparation of a "perfectly" size selected cluster beam allows the determination of the volume regarding the knowledge of the lattice constant. But, the shape and thus the surfaceto-volume ratio, properties which significantly determine electronic and magnetic behavior, are often already unknown for free clusters. This behavior becomes even more important for the system cluster on a surface where the interaction of the metallic cluster with the metallic surface have a significant influence on shape, electronic, and magnetic properties. The investigation with a method allowing the determination of structure, shape, and electronic behavior of single individual clusters will therefore be of great relevance for the understanding of cluster properties.