Vijay Sharma - the magnetic properties of Mn-doped ZnO

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  Publication Details (including relevant citation   information): Sharma, VK, Varma, GD, JOURNAL OF   ALLOYS AND COMPOUNDS, 2008, 458  (1-2), pp 523-527

  Abstract: The bulk polycrystalline samples of   Mn-doped ZnO were synthesized with the nominal compositions   Zn1-xMnxO (x = 0.02, 0.05, 0.10, 0.15, 0.20 and 0.25) via the   standard solid state reaction route by sintering at 800 degrees C   in air and argon atmospheres. The X-ray diffraction (XRD) studies   of the as synthesized samples exhibit the presence of mainly   wurtzite (hexagonal) crystal structure similar to the parent   compound (ZnO) in all the samples. In addition to this, XRD   results also indicate the presence of secondary phases like   ZnMn2O4 and Mn3O4 in minority. The M-H plots, recorded at room   temperature, of the samples sintered in air reveals the presence   of mainly paramagnetic behavior along with signature of weak   ferromagnetic interactions. On the other hand, the M-H curves of   all the samples sintered in argon atmosphere shows clear   hysteresis loop indicating the presence of room temperature   ferromagnetism (RTFM) in the samples. The value of magnetization   at a particular field increases as content of Mn in the samples   increases. The annealing of the samples in the hydrogenated argon   further enhances the magnetization and ferromagnetism, whereas   the same deteriorates on annealing in oxygen atmosphere. The   possible mechanisms of the observed room temperature   ferromagnetism have been discussed. (C) 2007 Elsevier B.V. All   rights reserved.

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