Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.75: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Magnetic coupling effects in ordered arrangements of magnetite nanoparticles — •Nils Neugebauer1, Matthias T. Elm1,2,3, and Peter J. Klar1,2 — 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
Fabrication of magnetic nanoparticle arrangements have attracted great interest for modern research due to their potential for various applications such as recording tapes, spintronic and magnetoresistive random access memory (MRAM). The influence of the distance between magnetic arrangements on the behavior of the macroscopic properties has not been sufficiently investigated yet. The knowledge of these properties is of enormous significance, e.g. for increasing the storage density of memory devices. The present study is performed to determine the distance dependence of the coupling between magnetic nanoparticle arrangements. By using electron-beam lithography and the meniscus force deposition method, structures with defined size and controlled spacing down to a few tens of nanometers can be assembled. Those structures were filled with magnetite (Fe3O4) nanoparticles with diameters of 20 nm. Ferromagnetic resonance measurements (FMR) are used to characterize the properties of those arrangements. It is revealed that there is a critical distance where coupling occurs, and that the nature of the interaction is also dependent on the spatial arrangement of the nanoparticle arrangements.