Dr. habil. Amitesh Paul
Technische Universität München, Physik-Department,
Lehrstuhl für Neutronenstreuung, James-Franck-Strasse 1, D-85748 Garching, Germany
I will discuss some general aspects of structural and magnetic correlations that can be accessed by various neutron and x-ray scattering techniques at low angle. Among several emergent systems investigated, I will focus on an exchanged coupled prototypical CoO/Co system under various conditions of field cooling. Some important correlations aspects will also be discussed with respect to non-magnetic nanostructures of different dimensions along with interfacial effects of heteroepitaxial functional materials, like BTO/LSMO etc. Eventually, I will introduce the case of topologically stabilized spin configurations like helices in the form of planar domain walls with magnetic functionalities in transition metal/rare-earth and rare-earth/rare-earth systems. Recently, using magnetization and susceptibility as a function of temperature along with thermo-remanent magnetization measurements we have confirmed superspin-glass type of behavior within a rareearth/rare-earth system of Dy/Tb. Interestingly, detailed analysis of the polarized neutron reflectometry profiles have established evidences of superimposed helical magnetic configurations within both materials of Dy and Tb associated with spin-frustrated interfaces. Realization of such spin configurations opens up the opportunity for scientific and technological applications in increasing the energy density for all-spin-based systems.