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@INPROCEEDINGS{Thoma:897118,
      author       = {Thoma, Henrik and Hutanu, Vladimir and Angst, Manuel and
                      Roth, Georg},
      title        = {{T}he {A}bsolute {D}irection of the
                      {D}zyaloshinskii-{M}oriya {I}nteraction in {H}ematite
                      {D}etermined by {P}olarized {N}eutron {D}iffraction},
      reportid     = {FZJ-2021-03616},
      year         = {2020},
      abstract     = {Polarized neutron diffraction (PND) is a powerful method
                      which provides direct access to the scattering con-tribution
                      from nuclear-magnetic interference and thus reveals the
                      phase difference between the nuclear andmagnetic structure.
                      This technique can be utilized to gain a detailed insight in
                      the microscopic spin orderingat the unit cell level even for
                      complex magnetic structures. Since magnetic domains
                      correspond to an overallphase shift between the nuclear and
                      magnetic structure, PND also allows to resolve different
                      magnetic domainconfigurations providing additional
                      information at the mesoscopic scale. This qualifies PND as a
                      versatile toolto simultaneously address a wide range of
                      scientific issues. By conducting a detailed PND study of the
                      proto-typical room-temperature weak ferromagnet α-Fe2O3
                      (hematite) we could solve the long standing problem
                      ofinconsistent asymmetry signs observed within Friedel pairs
                      in hematite. Moreover, using a detailed symme-try analysis
                      the absolute direction of the Dzyaloshinskii-Moriya
                      interaction (DMI) vector in α-Fe2O3 could bedetermined for
                      the first time. This study is supported by a detailed
                      refinement of the slightly canted magneticstructure and by
                      numerical calculations. It can be used as a reference for
                      further DMI sign determinations,reducing the experimental
                      efforts to the measurement of one representative reflection,
                      making it well suitedfor highly topical materials often
                      requiring extreme sample environment},
      month         = {Dec},
      date          = {2020-12-08},
      organization  = {MLZ User Meeting $\&$ German Neutron
                       Scattering Conference 2020, online
                       event (Germany), 8 Dec 2020 - 10 Dec
                       2020},
      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)24},
      url          = {https://juser.fz-juelich.de/record/897118},
}