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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{
  "sameAs": [
    "https://www.hzdr.de/publications/Publ-31690"
  ], 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "name": "Frequency- and magnetic-field-dependent properties of ordered magnetic nanoparticle arrangements", 
  "identifier": "https://doi.org/10.14278/rodare.578", 
  "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>", 
  "@type": "Dataset", 
  "datePublished": "2020-11-09", 
  "url": "https://rodare.hzdr.de/record/578", 
  "distribution": [
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  "creator": [
    {
      "name": "Neugebauer, Nils", 
      "@type": "Person"
    }, 
    {
      "name": "Hache, Toni", 
      "@id": "https://orcid.org/0000-0001-8245-5153", 
      "@type": "Person"
    }, 
    {
      "name": "Elm, M.", 
      "@type": "Person"
    }, 
    {
      "name": "Hofmann, D. M.", 
      "@type": "Person"
    }, 
    {
      "name": "Heiliger, C.", 
      "@type": "Person"
    }, 
    {
      "name": "Schulthei\u00df, Helmut", 
      "@id": "https://orcid.org/0000-0002-6727-5098", 
      "@type": "Person"
    }, 
    {
      "name": "Klar, P. J.", 
      "@type": "Person"
    }
  ], 
  "@id": "https://doi.org/10.14278/rodare.578", 
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