SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 36: Magnetic Particles / Clusters

MA 36.2: Vortrag

Donnerstag, 30. März 2023, 09:45–10:00, HSZ 401

Mössbauer spectroscopy study of anisotropic barium ferrite hybrid systems — •Juri Kopp1, Joachim Landers1, Soma Salamon1, Benoît Rhein3, Hajnalka Nádasi2, Darja Lisjak4, Patricija Hribar Boštjančič4, Alenka Mertelj4, Alexey Eremin2, Annette Schmidt3, and Heiko Wende11Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen — 2Department of Nonlinear Phenomena, Institute for Experimental Physics, Otto von Güricke University Magdeburg — 3Department of Chemistry, Physical Chemistry, University of Cologne — 4Department of Complex Matter, Jozef Stefan Institute

Using anisotropic barium ferrite nanoplatelets in liquid or liquid crystalline (LC) environments, we obtain ferrofluids with anisotropic properties such as nematic formation of the platelets or a magneto-responsive LC system. The aim of this work is to study magnetic hybrid systems with temperature- and field-dependent Mössbauer spectroscopy, which gives us access to the diffusion processes of the particles via line broadening, and to the magnetic orientation behavior based on relative line intensity ratios. As barium ferrite exhibits a rather complex crystal structure, we use reference data of powder samples in order to investigate each individual iron sublattice position of this system. In an approach to analyze anisotropic diffusion and alignment processes more efficiently, spectra are recorded with gamma incidence direction perpendicular and parallel relative to the applied magnetic field. This work is supported by the DFG (LA5175/1-1.).

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