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@INPROCEEDINGS{Petracic:1021733,
      author       = {Petracic, Oleg},
      title        = {{M}agnetic nanoparticles as building blocks for functional
                      materials and as carriers in medical applications},
      reportid     = {FZJ-2024-00973},
      year         = {2024},
      abstract     = {In recent decades, there has been considerable interest in
                      synthesizing, characterizing, and modeling magnetic
                      nanoparticles. This interest stems from the wide array of
                      practical applications. Moreover, magnetic nanoparticles
                      serve as model systems for fundamental scientific studies.
                      E.g. ensembles of well-defined monodisperse nanoparticles
                      function as building blocks for innovative material types
                      [1]. Understanding the properties of individual particles
                      and their ensembles is hereby crucial. The physical
                      properties of nanoscale magnetic systems result from
                      finite-size effects and dipolar magnetic interactions
                      between particles [2,3]. Proximity between different types
                      of particles or between particles and the supporting
                      substrate can lead to various effects, such as exchange bias
                      or magneto-electric coupling effects [4]. In the second
                      (shorter) part of this talk, I will present our recent
                      research on thin films of complex oxides. These oxides
                      display multiple phenomena, including various types of
                      magnetism, superconductivity, colossal magnetoresistance,
                      and ferroelectricity. Specifically, the presence of oxygen
                      vacancies can result in large ionic conductivities. We study
                      epitaxial thin films of La0.7Sr0.3MnO3-δ. Through in-situ
                      X-ray diffraction, we can track the structural transitions
                      that occur during thermal annealing. Gradual release of
                      oxygen causes a topotactic phase transition from the
                      initial, ferromagnetic Perovskite structure to an
                      antiferromagnetic Brownmillerite structure [5].[1] S.
                      Bedanta, O. Petracic, W. Kleemann, Supermagnetism, Handbook
                      of Magnetic Materials, Ed. K.H.J. Buschow, Volume 23
                      (2015)[2] O. Petracic, Superlatt. Microstr. 47, 569
                      (2010)[3] D. Mishra, D. Greving, G. A. Badini Confalonieri,
                      J. Perlich, B.P. Toperverg, H. Zabel, O. Petracic,
                      Nanotechnology 25, 205602 (2014)[4] L.-M. Wang, O. Petracic,
                      E. Kentzinger, U. Rücker, Th. Brückel, Nanoscale 9, 12957
                      (2017)[5] L. Cao, O. Petracic, P. Zakalek, A. Weber, U.
                      Rücker, J. Schubert, A. Koutsioubas, S.Mattauch, Th.
                      Brückel, Adv. Mater. 31, 1806183 (2019)},
      month         = {Jan},
      date          = {2024-01-30},
      organization  = {Institutsseminar, Leibniz
                       Forschungszentrum der Leibniz
                       Universität Hannover (Germany), 30 Jan
                       2024},
      subtyp        = {Invited},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      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/1021733},
}