Vijay Sharma - 0.05) Samples Synthesized by Chemical Vapor Deposition

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  Publication Details (including relevant citation   information): Sharma, VK, Bhadram, VS, Das Varma, G,   JAPANESE JOURNAL OF APPLIED PHYSICS,   2008, 47 (10), pp 7831-7835

  Abstract: We report on the structural and   magnetic properties of the nanocrystalline samples of Zn1-xMnxO   (x = 0 and 0.05) synthesized by chemical vapor deposition (CVD)   technique. X-ray diffraction (XRD) and transmission electron   microscopy (TEM) Studies of the samples reveal pure wurtzite   structure of ZnO with no impurity phase in all the synthesized   samples. TEM study reveals that the particle sizes of the   Zn1-xMnxO (x = 0 and 0.05) samples vary in the range 15-25 nm.   Magnetic measurements show weak ferromagnetism for x = 0.05 and   diamagnetic behavior for x = 0 at room temperature. Annealing in   Ar/H-2 enhances ferromagnetism in Zn0.95Mn0.05O whereas pure ZnO   remains diamagnetic. Magnetization versus temperature (M-T)   measurements in the temperature range 5-300 K also suggests Curie   temperature above room temperature for Ar/H-2 annealed   (hydrogenated) Zn0.95Mn0.05O samples. The observed room   temperature ferromagnetism (RTFM) in the present case may be   attributed to the oxygen vacancies produced on annealing the   sample in reducing atmosphere (Ar/H-2) and is not due to any   secondary phases or clusters of Mn. [DOI: 10.1143/JJAP.47.7831]

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