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Synthesis, Structural and Ferromagnetic Properties of Co Doped SnO2 Dilute Magnetic Semiconductors

Author: ChunBenGaoZhi
Tutor: YuRongHai；ZhongCunJiNan；ShiZhun
School: Tsinghua University
Course: Materials Science and Engineering
Keywords: Dilute magnetic semiconductors (DMS) SnO2 Defects Disorder Raman spectroscopy Magnetic property
CLC: TN304
Type: Master's thesis
Year: 2009
Downloads: 56
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Abstract


Co doped SnO2 thin films and nanoparticles have been prepared using sputtering deposition and wet chemical methods, respectively. The deposit films and prepared nanoparticles exhibit room temperature ferromagnetism.In films case, the magnetic properties are strongly influenced by the sputtering conditions and observed to be enhanced at low oxygen partial pressure. It has found that the films annealed in vacuum show the improved magnetic properties compared with as-grown films. The origin of ferromagnetism in these films can be explained using bound magnetic polaron (BMP).At nanoscale, the Co doped SnO2 nanoparticles have been synthesized using simple, quick and versatile wet solution method. The structural, vibrational and investigation show that the Co dopant is successfully incorporated into the SnO2 lattice with in 2+ oxidation state. The prepared nanoparticles exhibit room temperature ferromagnetism, which may be arise due to defects and disordered in the structure introduced by hydroxyls at the time synthesis.In order to see the effect of additional dopant, Zn has been co-doped with Co into SnO2 nanoparticles using the same above wet chemical method. The results demonstrate that the co-doping of Zn with Co into the SnO2 lattice degrades the ferromagnetic properties.

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