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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.41: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P3

Investigation of the dipole interaction in and between ordered arrangements of magnetic nanoparticles — •Nils Neugebauer, Alexander Fabian, Matthias T. Elm, Michael Czerner, Christian Heiliger, and Peter J. Klar — Institute of Experimental Physics I, Heinrich-Buff-Ring 16, 35392 Gießen, Germany

Magnetite nanoparticles (Fe₃O₄) with an average diameter of 20 nm were arranged into regular arrays of circular assemblies with well controlled dimensions by combining top-down lithographic methods with the meniscus force deposition method. Angle-dependent ferromagnetic resonance (FMR) measurements were carried out in order to characterize the specific properties of these assemblies. The measurements show that several resonances appear exhibiting a different dependence on the orientation of the external magnetic field, the degree of filling of the assemblies, and the spacings of the underlying grid. By varying the surface-to-volume ratio of the circular assemblies, we were able to manipulate the intensity and the resonance position of the resonances observed. In addition, micromagnetic simulations were performed to assign each resonance to characteristic collective oscillations within the nanoparticle assemblies.