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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    <subfield code="a">Frequency- and magnetic-field-dependent properties of ordered magnetic nanoparticle arrangements</subfield>
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    <subfield code="a">&lt;p&gt;We present a frequency and magnetic field dependent investigation of ordered arrangements of 20 nm magnetic&lt;br&gt;
nanoparticles (MNPs) consisting of magnetite (Fe3O4) by employing micro Brillouin light scattering&lt;br&gt;
microscopy. We utilized electron beam lithography to prepare hexagonally arranged, circularly shaped MNPassemblies&lt;br&gt;
consisting of a single layer of MNPs using a variant of the Langmuir-Blodgett technique. By&lt;br&gt;
comparing the results with non-structured, layered superlattices of MNPs, further insight into the influence&lt;br&gt;
of size and geometry of the arrangement on the collective properties is obtained. We show that at low static&lt;br&gt;
external field strengths, two signals occur in frequency dependent measurements for both non-structured and&lt;br&gt;
structured assemblies. Enlarging the static external field strength leads to a sharpening of the main signal,&lt;br&gt;
while the satellite signal decreases in its intensity and increases in its linewidth. The occurrence of multiple&lt;br&gt;
signals at low external field strengths is also confirmed by sweeping the static external field and keeping the&lt;br&gt;
excitation frequency constant. Micromagnetic simulations unravel the origin of the different signals and their&lt;br&gt;
dependence on the static external field strength, enabling an interpretation of the observed characteristics in&lt;br&gt;
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