Structural and magnetic properties of Fe doped NiO |
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| Authors: | P Mallick Chandana Rath R Biswal and N C Mishra |
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| Institution: | (1) Department of Physics, North Orissa University, Baripada, 757 003, Orissa, India;(2) School of Material Science & Technology, Institute of Technology, Banaras Hindu University, Varanasi, 221 005, Uttar Pradesh, India;(3) Department of Physics, Utkal University, Bhubaneswar, 751 004, Orissa, India |
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| Abstract: | Mott-Hubbard anti-ferromagnetic insulator, NiO shows p-type semiconducting behaviour due to vacancy at Ni2+ site in its bunsenite structure. We report the modification of structural and magnetic order in NiO on Fe doping. NiO samples
at different Fe concentrations in the range 0 to 5 at.% have been prepared by chemical co-precipitation and post thermal decomposition
method. Both structural and magnetic characterization reveal that with increasing Fe doping concentration, NiO evolves as
a magnetically inhomogeneous state out of the parent homogeneous antiferromagnetic state. In addition, structural inhomogeneity
was also observed with Fe precipitating to γ-Fe2O3 phase, the signature of which could be clearly seen for Fe content beyond 2 at.%. At lower Fe content however, some amount
of Fe occupies lattice and interstitial sites in the NiO matrix and drive the latter to acquire ferromagnetic ordering, which
was evident from a clear hysteresis loop at 300 K.
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| Keywords: | Dilute magnetic semiconductor X-ray diffraction magnetization NiO |
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