Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.60: Poster
Thursday, September 8, 2022, 16:00–18:00, P4
Mössbauer study of anisotropic magnetic nanoparticle systems — •Juri Kopp1, Joachim Landers1, Soma Salamon1, Robert Müller2, Sarah Essig3, Silke Behrens3, and Heiko Wende1 — 1Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen — 2Leibniz Institute of Photonic Technology — 3Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology
Liquid crystalline (LC) systems have a wide range of applications as they combine the properties of a liquid and orientability in electric fields. In turn, if magnetic nanoparticles are added to such systems, we obtain magneto-responsive liquid crystals. Barium ferrite particles can be considered as possible candidates for use in such magneto-responsive LC systems. Accordingly, this work is geared towards the study of doped and undoped anisotropic barium ferrite nanoparticles using magnetic field and temperature dependent Mössbauer spectroscopy. In pure barium ferrite samples, the five different sublattice positions could be resolved and reorientation in magnetic fields was observed. In the doped samples an asymmetry in the Mössbauer lines as well as partial overlap of the individual sublattices’ contributions was visible, which points towards altered environments of the iron atoms. In particular, the 2b site with its relatively high quadrupole level shift provides information about the magnetic orientation relative to the crystal structure. These results enable us to analyze orientation phenomena in future barium ferrite based magnetic liquid crystalline systems.