SKM 2023 – scientific programme
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MA: Fachverband Magnetismus
MA 36: Magnetic Particles / Clusters
MA 36.5: Talk
Thursday, March 30, 2023, 10:30–10:45, HSZ 401
Distance- and size-dependence of the interactions within highly ordered magnetic nanoparticle mesocrystals — •Nils Neugebauer1,2, Yi Wang3, Matthias Elm1,2, Xingchen Ye3, Christian Heiliger1,4, and Peter Klar1,2 — 1) Institute of Experimental Physics I, Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany — 2Center for Materials Research (LaMa), Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany — 3Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States — 4) Institute for Theoretical Physics, Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
Ferromagnetic resonance (FMR) experiments in combination with micromagnetic simulations are employed to investigate and characterize dipolar interactions between magnetic nanoparticles (MNPs) within such mesocrystals. The MNPs investigated in this work consist of iron oxide (magnetite - Fe3O4) and are coated with non-magnetic polymers, forming highly ordered hexagonal monolayer crystals. The magnetic response of the regularly arranged hexagonal mesocrystals can be tuned in a controlled way by varying the thickness of the non-magnetic polymer coating of the MNPs and thus the lattice constant of the mesocrystal.
The spectral features show distinct dipolar coupling phenomena within the mesocrystal and reveal that the material parameters of the MNPs such as the magnetization and the magnetocrystalline anisotropy are reduced with respect to their bulk counterpart.