% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Sodernik:893187,
      author       = {Soderžnik, Kristina Žagar and Rožman, Kristina Žužek
                      and Komelj, Matej and Kovács, András and Diehle, Patrick
                      and Denneulin, Thibaud and Savenko, Aleksei and Soderžnik,
                      Marko and Kobe, Spomenka and Dunin-Borkowski, Rafal E. and
                      Mayer, Joachim and Markoli, Boštjan and Šturm, Sašo},
      title        = {{M}icrostructural insights into the coercivity enhancement
                      of grain-boundary-diffusion-processed {T}b-treated
                      {N}d-{F}e-{B} sintered magnets beyond the core-shell
                      formation mechanism},
      journal      = {Journal of alloys and compounds},
      volume       = {864},
      issn         = {0925-8388},
      address      = {Lausanne},
      publisher    = {Elsevier},
      reportid     = {FZJ-2021-02611},
      pages        = {158915 -},
      year         = {2021},
      abstract     = {We propose a dominant core-shell formation mechanism for
                      grain-boundary-diffusion-processed (GBDP), Tb-treated,
                      Nd2Fe14B sintered magnets. A depth-sensitive analysis of
                      Tb-treated samples, relative to a non-GBDP Nd2Fe14B magnet,
                      showed a $30\%$ increase of the coercivity in the central
                      part of the magnet. A structure-chemistry-magnetic-property
                      analysis revealed the dominant GBDP mechanism. On the
                      surface of the Tb-treated magnet, the Tb is released from
                      the starting precursor following a cascade of chemical
                      reactions between the Tb oxide and the Nd and/or the
                      Nd-Fe-B. The released Tb diffuses along the grain
                      boundaries, forming a core-shell structure. The calculated
                      optimum concentration for a $30\%$ increase in the
                      coercivity was 50 ppm of Tb. Off-axis electron-holography
                      measurements were used to quantitatively map the
                      characteristic magnetic states of the samples, confirming a
                      different magnetic domain structure in the shell than in the
                      core. The magnetic induction in the core was found to be
                      $26\%$ higher than that of the shell, which has a lower
                      magnetic saturation due to the presence of Tb. The results
                      show that the measured increase in the coercivity is due to
                      a structural effect, and not the magnetic contribution of
                      the Tb. Our results pave the way towards
                      grain-boundary-engineering studies that can be used to
                      increase the coercivity of Nd-Fe-B magnets for e-mobility
                      and eco-power applications.},
      cin          = {ER-C-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ER-C-1-20170209},
      pnm          = {535 - Materials Information Discovery (POF4-535) / ESTEEM3
                      - Enabling Science and Technology through European Electron
                      Microscopy (823717) / 3D MAGiC - Three-dimensional
                      magnetization textures: Discovery and control on the
                      nanoscale (856538) / DFG project 405553726 - TRR 270:
                      Hysterese-Design magnetischer Materialien für effiziente
                      Energieumwandlung (405553726)},
      pid          = {G:(DE-HGF)POF4-535 / G:(EU-Grant)823717 /
                      G:(EU-Grant)856538 / G:(GEPRIS)405553726},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000624942300102},
      doi          = {10.1016/j.jallcom.2021.158915},
      url          = {https://juser.fz-juelich.de/record/893187},
}