Vijay Sharma - Strain induced ferromagnetism in Sb co-doped ZnMnO samples

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      Publication Details (including relevant citation   information): Sharma, VK, Varma, GD, JOURNAL OF   PHYSICS-CONDENSED MATTER, 2009, 21  (29)

      Abstract: We report on the effect of Sb   co-doping on the structural and magnetic properties of bulk ZnMnO   samples. Samples with nominal compositions   Zn(0.98-y)Mn(0.02)Sb(y)O (y = 0, 0.01 and 0.03) were synthesized   using a solid state reaction route at 800 degrees C. X-ray   diffraction (XRD) results reveal wurtzite structure of pure ZnO   without any impurity phases for compositions y = 0.0 and 0.01. On   the other hand, a weak diffraction peak corresponding to the   impurity phase Zn/MnSb(2)O(6) was detected in the XRD pattern of   composition y = 0.03. Energy dispersive x-ray (EDAX) results   confirm the presence of all elements in the samples in the   stoichiometric ratio. The M-H curve of the pure ZnMnO sample   shows paramagnetic behavior, whereas M-H curves of Sb co-doped   samples show room temperature ferromagnetism (RTFM) with   saturated loops. Saturation magnetization (M(S)) and coercive   field (H(C)) both increase with the increase in Sb doping   percentage. Inverse susceptibility (1/chi) versus temperature (T)   curves suggests dominant antiferromagnetic interactions in the   samples which decrease with the co-doping of Sb. Based on the   experimental results we conclude that the observed RTFM in Sb   co-doped ZnMnO is due to defects induced by strain.

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