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@INPROCEEDINGS{Nandakumaran:894053,
      author       = {Nandakumaran, N. and Feygenson, M. and Fanatechi, E. and
                      Pinieder, F. and Feoktystov, Artem and Brückel, Thomas},
      title        = {{I}nvestigating self-assembly of {A}u-{F}e3{O}4 dumbbell
                      nanoparticles using advanced scattering techniques},
      reportid     = {FZJ-2021-03007},
      year         = {2021},
      abstract     = {We investigated parameters that affect self-assembly of
                      magnetic dumbbellnanoparticles (DBNPs) in solution. The
                      dumbbells consist of epitaxially grownmagnetic Fe3O4
                      nanoparticles on the surface of spherical Au nanoparticles.
                      Theirstructural, optical and magnetic properties are useful
                      for variety of applications suchas dual probes for drug
                      delivery [1-2], catalysis [3], sensing [4], optics [5]
                      andelectronics [6]. However, fundamental understanding of
                      mechanisms and parametersinvolved in self-assembly of DBNPs
                      in solution is still missing. We studied severalDBNPs coated
                      with a mixture of oleic acid and oleylamine of different
                      sizes: A13F14,A11F8, A10F14, A10F12, A9F11, where numbers
                      indicate the diameters of Au (A)and Fe3O4 (F), respectively.
                      Field-dependent DC magnetization reveals differentshapes of
                      hysteresis loops for our samples, which is presumably due to
                      a Au/Fe3O4interface and modification of magnetization
                      profile of Fe3O4 [7-8]. Small-angle neutronscattering in
                      applied magnetic field showed self-assembly of DBNPs in
                      solutions, incontrast to zero-field measurements. We
                      observed the onset of order beginning at0.2 T for A10F14,
                      A9F11 and at 1T for A13F14 (Figure 1). Surprisingly, we
                      found noself-assembly for A10F12 and A11F8 even at 3T. We
                      also performed a polarizedSANS at 1T and 3T to separate
                      nuclear and weak magnetic scattering.},
      month         = {May},
      date          = {2021-05-31},
      organization  = {725. WE-Heraeus-Seminar: Magnetic
                       Small Angle Neutron Scattering – from
                       Nanoscale Magnetism to Long‐Range
                       Magnetic Structures, online event
                       (online event), 31 May 2021 - 3 Jun
                       2021},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-ESS / JCNS-FRM-II},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-ESS-20170404 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      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)1},
      url          = {https://juser.fz-juelich.de/record/894053},
}