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@INPROCEEDINGS{Petracic:1047700,
      author       = {Petracic, Oleg},
      title        = {{C}ollective phenomena in magnetic nanoparticle systems and
                      complex oxide thin films - and future plans},
      reportid     = {FZJ-2025-04466},
      year         = {2025},
      abstract     = {In recent decades, there has been considerable interest in
                      synthesizing, characterizing, andmodeling magnetic
                      nanoparticles. This interest stems from the wide array of
                      potential oralready existing applications such as functional
                      materials, ferrofluids, smart coatings, novelspintronic
                      devices, magnetic tracers for medical imaging methods,
                      targeted drug delivery,magnetic hyperthermia, magnetic
                      separation, and many more. Here I will discuss
                      variousresults on iron oxide nanoparticles (IONPs) and focus
                      on three aspects: properties of individualIONPs, collective
                      properties of interacting IONPs, and properties coming from
                      the coupling to aferroelectric substrate. In a second part,
                      I will discuss properties of thin films of complex
                      oxides.Complex oxides display multiple phenomena, including
                      various types of magnetism,superconductivity, colossal
                      magnetoresistance, and ferroelectricity. Specifically, the
                      presenceof oxygen vacancies can result in large ionic
                      conductivities. We have investigated epitaxial thinfilms of
                      La0.7Sr0.3MnO3-δ and La0.7Sr0.3CoO3-δ. Gradual release of
                      oxygen causes a topotactic phasetransition from the initial,
                      ferromagnetic metallic perovskite structure to an
                      antiferromagneticinsulating brownmillerite structure. In the
                      third part, I will briefly discuss future plans in thearea
                      of collective phenomena in JCNS-2.},
      organization  = {(Digital) Institute Seminar JCNS-2,
                       Forschungszentrum Jülich, JCNS
                       (Germany)},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)31},
      url          = {https://juser.fz-juelich.de/record/1047700},
}