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@INPROCEEDINGS{Thoma:897116,
      author       = {Thoma, Henrik and Hutanu, Vladimir and Angst, Manuel and
                      Roth, Georg},
      title        = {{P}olarized neutron diffraction studies on weak
                      ferromagnets at instrument {POLI} at {MLZ}},
      reportid     = {FZJ-2021-03614},
      year         = {2019},
      abstract     = {Polarized neutron diffraction (PND) is a powerful method to
                      investigate magnetic structures. PND can be used for very
                      precise magnetization measurements even for weak magnetic
                      contributions. It allows the high-quality determination of
                      magnetic form factors, to untangle complex (e.g. chiral)
                      magnetic structures, and to follow the movement of magnetic
                      domains. By conserving the phase relation between the
                      nuclear and magnetic structure, this technique is also a
                      valuable tool to investigate the Dzyaloshinskii–Moriya
                      interaction (DMI) [1], which is an important driving force
                      in many magnetic materials including weak ferromagnets.Using
                      the Flipping Ratio (FR) setup [2] of POLI [3] at MLZ, the
                      magnetic structures of two prototypical weak ferromagnets,
                      hematite (α-Fe2O3) and rhodochrosite (MnCO3), have been
                      studied in detail as function of the applied magnetic field
                      and temperature. This allowed us to determine the magnetic
                      susceptibility tensor and, for the first time with neutrons,
                      the absolute sign of the DMI in both compounds. Moreover,
                      due to the large q-range access of POLI, we were able to
                      reconstruct field induced magnetization density distribution
                      maps by using the maximum entropy method.[1] V. E.
                      Dmitrienko et al., Nat. Phys. 10, 202 (2014)[2] H. Thoma, W.
                      Luberstetter, J. Peters, and V. Hutanu, J. Appl. Cryst. 51,
                      17-26 (2018)[3] V. Hutanu, Heinz Maier-Leibnitz Zentrum,
                      Journal of large-scale research facilities, 1, A16 (2015)},
      month         = {Dec},
      date          = {2019-12-10},
      organization  = {MLZ User Meeting 2019, Munich
                       (Germany), 10 Dec 2019 - 11 Dec 2019},
      subtyp        = {After Call},
      cin          = {JCNS-FRM-II / JARA-FIT / JCNS-2 / JCNS-4 / MLZ},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-2-20110106 /
                      I:(DE-Juel1)JCNS-4-20201012 / I:(DE-588b)4597118-3},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632)},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632},
      experiment   = {EXP:(DE-MLZ)POLI-HEIDI-20140101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/897116},
}