Fe Clusters As Origin Of Ferromagnetism In Hydrogenated Zn1-xFexO (x= 0.02 & 0.05) Samples
V. K. Sharma1, 2*, G.D. Varma2
1Department of Physics, University of Petroleum & Energy Studies, Dehradun 248007, India
2Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India
Adv. Mater. Lett., 2012, 3 (2), pp 126-129
DOI: 10.5185/amlett.2011.7283
Publication Date (Web): Apr 14, 2012
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E-mail: vks80dph@gmail.com
Bulk samples of Zn1-xFexO (x=0.02 and 0.05) were synthesized via solid state reaction route by sintering in air at 800o C. Some sintered samples were annealed in Ar/H2 at 800o C for ~ 5 hrs. X-ray diffraction results reveal that the basic crystal structure of the as sintered and hydrogenated (Ar/H2) samples corresponds to ZnO wurtzite structure together with some traces of ZnFe2O4 in the as sintered and Fe metal in the hydrogenated samples. The as sintered samples of both compositions show paramagnetic behaviour and after hydrogenation they exhibit ferromagnetic interactions at room temperature. Increase in the electrical conductivity has also been observed in the hydrogenated samples. The presence of small Fe clusters in the hydrogenated samples are expected to be responsible for the observed room temperature ferromagnetism.
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