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@ARTICLE{Thoma:891615,
      author       = {Thoma, H. and Hutanu, V. and Deng, H. and Dmitrienko, V. E.
                      and Brown, P. J. and Gukasov, A. and Roth, G. and Angst, M.},
      title        = {{R}evealing the {A}bsolute {D}irection of the
                      {D}zyaloshinskii-{M}oriya {I}nteraction in {P}rototypical
                      {W}eak {F}erromagnets by {P}olarized {N}eutrons},
      journal      = {Physical review / X},
      volume       = {11},
      number       = {1},
      issn         = {2160-3308},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2021-01626},
      pages        = {011060},
      year         = {2021},
      abstract     = {Polarized neutron diffraction (PND) is a powerful technique
                      to distinguish a weak magnetic contribution from the total
                      scattering intensity. It can provide a detailed insight into
                      the microscopic spin ordering at the unit cell level, but
                      also into the mesoscopic magnetic ordering, like different
                      types of domain populations. Here we report on the
                      application of this technique to the long-standing problem
                      of determining the absolute direction of the
                      Dzyaloshinskii-Moriya vector in relation to the crystal
                      structure. The proposed PND method, based on the measurement
                      of one representative reflection, is easy to perform and
                      straightforward to interpret. The absolute sign of the
                      Dzyaloshinskii-Moriya interaction (DMI) in MnCO3 has been
                      independently determined by PND and found to be in agreement
                      with recent results obtained by resonant magnetic
                      synchrotron scattering. This validates the method. In
                      addition, the absolute DMI vector direction in the
                      prototypical room-temperature weak ferromagnet α-Fe2O3
                      (hematite) has been determined for the first time. To
                      demonstrate the generality of our method, further examples
                      with different symmetries are also presented. Ab initio
                      calculations of the resulting weak noncollinear
                      magnetization using the quantum espresso package,
                      considering DMI in addition to the symmetric magnetic
                      exchange interaction, were also conducted and found to be in
                      agreement with the experimental results from PND.},
      cin          = {JCNS-FRM-II / JCNS-2 / JARA-FIT / PGI-4 / JCNS-4 / MLZ},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)PGI-4-20110106 / 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)16},
      UT           = {WOS:000634564900001},
      doi          = {10.1103/PhysRevX.11.011060},
      url          = {https://juser.fz-juelich.de/record/891615},
}