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@INPROCEEDINGS{Gupta:863009,
      author       = {Gupta, Mukul and Seema and Pandey, Nidhi and Amir, S. M.
                      and Pütter, Sabine and Mattauch, Stefan},
      title        = {{S}ynthesis, structure and magnetization of {C}o$_4${N}
                      thin films},
      journal      = {Journal of magnetism and magnetic materials},
      volume       = {489},
      issn         = {0304-8853},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ. Co.},
      reportid     = {FZJ-2019-03155},
      pages        = {165376 -},
      year         = {2019},
      abstract     = {We reviewed magnetic tetra metal nitrides – Fe$_4$N and
                      Co$_4$N for their structure, magnetization and the
                      thermodynamics of phase formation. Opposed to Fe$_4$N, the
                      formation of a stoichiometric Co$_4$N turns out to be
                      extremely difficult. A review of the literature of Co$_4$N
                      compound suggest that the experimental lattice parameter
                      (LP) was always found to be smaller than the theoretical
                      predicted value. It can also be seen that as the substrate
                      temperature (T$_s$) increases, the LP of Co$_4$N film
                      decreases. In this work, we deposited Co$_4$N films using
                      molecular beam epitaxy (MBE), direct current magnetron
                      sputtering (dcMS) and high power impulse MS (HiPIMS). Films
                      were characterized using X-ray diffraction, X-ray
                      reflectivity and atomic force microscopy. It was found that
                      at high T$_s$, N out-diffusion significantly affects the
                      growth of Co$_4$N phase. We found that the MBE deposited
                      films did not show any signature of Co$_4$N phase when T$_s$
                      < 703 K but at T$_s$ = 703 K, the phase formed can be
                      assigned to fcc Co rather than Co$_4$N. On the other hand,
                      the dcMS and HiPIMS grown films clearly show the presence of
                      Co$_4$N phase even at T$_s$ = 300 K. Detailed analysis of
                      Co4N films grown using dcMS and HiPIMS reveals that HiPIMS
                      grown films are single phase and have a denser
                      microstructure. The density of HiPIMS deposited film was
                      also found to be close to the theoretical value. Magneto
                      optical Kerr effect and polarized neutron reflectivity
                      measurements were carried out to study magnetic properties.
                      Differences in the magnetic moment and magnetic anisotropy
                      were correlated with structural parameters. Obtained results
                      are presented and discussed in terms of involved thin film
                      growth mechanism.},
      month         = {Dec},
      date          = {2018-12-09},
      organization  = {International Conference on Magnetic
                       Materials and Applications, Bhubaneswar
                       (India), 9 Dec 2018 - 13 Dec 2018},
      cin          = {JCNS-FRM-II / JCNS-2 / MLZ},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623) / 6G15 - FRM II / MLZ
                      (POF3-6G15) / 524 - Controlling Collective States
                      (POF3-524)},
      pid          = {G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-524},
      experiment   = {EXP:(DE-MLZ)MARIA-20140101 / EXP:(DE-MLZ)MBE-MLZ-20151210},
      typ          = {PUB:(DE-HGF)16 / PUB:(DE-HGF)8},
      UT           = {WOS:000473578000073},
      doi          = {10.1016/j.jmmm.2019.165376},
      url          = {https://juser.fz-juelich.de/record/863009},
}