November 9, 2020 Dataset Open Access

Neugebauer, Nils; Hache, Toni; Elm, M.; Hofmann, D. M.; Heiliger, C.; Schultheiß, Helmut; Klar, P. J.

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    "description": "<p>We present a frequency and magnetic field dependent investigation of ordered arrangements of 20 nm magnetic<br>\nnanoparticles (MNPs) consisting of magnetite (Fe3O4) by employing micro Brillouin light scattering<br>\nmicroscopy. We utilized electron beam lithography to prepare hexagonally arranged, circularly shaped MNPassemblies<br>\nconsisting of a single layer of MNPs using a variant of the Langmuir-Blodgett technique. By<br>\ncomparing the results with non-structured, layered superlattices of MNPs, further insight into the influence<br>\nof size and geometry of the arrangement on the collective properties is obtained. We show that at low static<br>\nexternal field strengths, two signals occur in frequency dependent measurements for both non-structured and<br>\nstructured assemblies. Enlarging the static external field strength leads to a sharpening of the main signal,<br>\nwhile the satellite signal decreases in its intensity and increases in its linewidth. The occurrence of multiple<br>\nsignals at low external field strengths is also confirmed by sweeping the static external field and keeping the<br>\nexcitation frequency constant. Micromagnetic simulations unravel the origin of the different signals and their<br>\ndependence on the static external field strength, enabling an interpretation of the observed characteristics in<br>\nterms of different local environments of an MNPs forming the MNP assembly.</p>", 
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    "title": "Frequency- and magnetic-field-dependent properties of ordered magnetic nanoparticle arrangements", 
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