Regensburg 2022 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 13: Non-equilibrium Phenomena in Materials Induced by Electrical and Magnetic Fields 3

MM 13.2: Topical Talk

Dienstag, 6. September 2022, 10:45–11:15, H45

X-Ray Spectro(micro)scopy as analytics for field assisted deposition processes — •David N. Mueller — Peter Grünberg Institut, Forschungszentrum Jülich

X-Ray absorption spectroscopy (XAS) is element specific, sensitive to the electronic structure around the Fermi level, and provides information about the short-range order in a material, and can be tuned to be surface sensitive. It therefore represents a versatile tool to assess the impact of external fields during synthesis of functional materials on the structure property relations required for optimizing functionalization. Providing spatial resolution on the sub micrometer scale with X-Ray photoemission electron microscopy (XPEEM) additionally allows identification of phase inhomogeneities and their peculiarities with respect to chemistry and structure.

In this presentation, we will use 3d transition metal based oxides of varying complexity to showcase how XAS and XPEEM can give valuable insights into the atomic and electronic structure and how those can be improved towards use in e. g. catalysis by using external fields during synthesis. It will furthermore be discussed how numerical methods such as principal component analysis can help analyzing spectromicroscopic data to unambiguously identify subtle lateral inhomogeneities in the spectroscopic signatures, providing information about phase formation and decomposition processes.