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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 Wende¹ — ¹Faculty 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.).