Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.57: Poster
Tuesday, April 2, 2019, 10:00–13:00, Poster E
Investigation of the interaction between magnetic nanoparticles in different geometries by using FMR — •Nils Neugebauer1, Matthias Elm1,2,3, Peter Klar1,2, Detlev Hofmann1,2, Alexander Fabian2,4, Michael Czerner2,4, and Christian Heiliger2,4 — 1Institute of Experimental Physics I, Heinrich-Buff-Ring 16, 35392 Gießen, Germany — 2Center for Materials Research (LaMa), Heinrich-Buff-Ring 16, 35392 Gießen, Germany — 3Institute of Physical Chemistry, Heinrich-Buff-Ring 17, 35392 Gießen, Germany — 44Institute for Theoretical Physics, Justus Liebig University Gießen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
Assemblies with well defined sizes and spacings consisting of magnetite nanoparticles (Fe3O4) with an average diameter of 20 nm were created by using meniscus force deposition method on substrates pre-patterned by electron beam lithography. To study the magnetic properties of the nanoparticle arrangements, angle-dependent ferromagnetic resonance experiments (FMR) were carried out for different measurement geometries. The analysis of the FMR spectra reveals that there are two resonances present. In in-plane geometry one resonance exhibits a clear angular dependence, while the second one remains constant. In order to get a deeper understanding of the results, micromagnetic simulations were carried out. By studying the dynamic properties in terms of solving the Landau-Lifschitz-Gilbert equation numerically it has been possible to assign these signals to different areas within the magnetic structures.