Spin structures in transition metal oxide or chalgogenide chains

本项目的目的是制造新的一维磁性结构，阐明其自旋结构和原子结构，并确定潜在的相互作用机制。金属衬底上的过渡金属氧化物和过渡金属硫族化合物是一类很有前途的一维结构材料。这使我们不仅可以研究过渡金属离子的性质及其电荷或自旋状态的影响，还可以研究介导耦合的邻近原子的化学性质的影响。我们通过一种独特的实验方法来实现这一目标，这种方法一方面可以阐明表面的结构特性，另一方面可以阐明实际空间中的局部磁顺序。这将使我们能够以前所未有的精度研究磁性有序现象对一维过渡金属氧化物和新制备的过渡金属硫族化合物的化学计量的依赖。我们特别感兴趣的是沿链形成共线或非共线自旋结构的条件，以及垂直于它们的条件。在本项目的选择中，相关参数系统地变化，包括TM离子的性质、氧化值、底物的变化、16族元素的结合伙伴的变化以及链结构之间额外吸附作用对底物耦合的变化。

The aim of this project is to fabricate novel one-dimensional (1D) magnetic structures, to elucidate their spin structure and atomic structure and to identify the underlying interaction mechanisms. As a promising class of materials for the 1D structures, we focus on transition metal oxides and transition metal chalcogenides on metal substrates. This allows us to investigate not only the influence of the nature of the transition metal ion and its charge or spin state, but also the influence of the chemistry of the immediate neighboring atoms that mediate the coupling. We achieve this by a unique combination of experimental methods that can elucidate the structural properties of the surface on the one hand and the local magnetic order in real space on the other. This will allow us to investigate the dependence of magnetic ordering phenomena on the stoichiometry of the 1D transition metal oxides and the newly prepared transition metal chalcogenides with unprecedented precision. In particular, we are interested in the conditions under which collinear or non-collinear spin structures are formed along the chains but also perpendicular to them. Relevant parameters, which are systematically varied in a selection in this project, are the nature of the TM ion, its oxidation number, the variation of the substrate, the variation of the binding partners from the elements of group 16 and the change of the substrate coupling by additional adsorbates between the chain structures.