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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},
}