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Chin. Phys. B, 2009, Vol. 18(12): 5501-5506    DOI: 10.1088/1674-1056/18/12/062
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Comparative studies on Zn0.95Co0.05O thin films on C- and R-sapphire substrates

Peng Ying-Zi(彭英姿)a)b)c)†,Thomas Liew a)b),Song Wen-Donga), and Chong Tow Chong a)b)
a Data Storage Institute, DSI Building, 5 Engineering Drive 1, Singapore 117608; b Electrical and Computer Engineering Department, National University of Singapore, Singapore 119260; c School of Science, Hangzhou Dianzi University, Hangzhou 310018, China
Abstract  Zn0.95Co0.05O precipitate-free single crystal thin films were synthesized by a dual beam pulsed laser deposition method. The films form a wurtzite structure whose hexagonal axis is perpendicular or parallel to the plane of the surface depending on the C-plane (0001) or R-plane (11$\bar{2}$0) sapphire substrate. Based on the results of high-resolution transmission electron microscopy and x-ray diffraction, C-plane films show larger lattice mismatch. The films exhibit magnetic and semiconductor properties at room temperature. The coercivity of the film is about 8000 A/m at room temperature. They are soft magnetic materials with small remanent squareness S for both crystal orientations. There is no evidence to show that the anisotropy is fixed to the hexagonal axis (C-axis) for the wurtzite structure.
Keywords:  Co-doped ZnO thin films      diluted magnetic semiconductor      anisotropy  
Received:  14 May 2007      Revised:  25 June 2009      Accepted manuscript online: 
PACS:  68.55.-a (Thin film structure and morphology)  
  68.37.Lp (Transmission electron microscopy (TEM))  
  75.50.Pp (Magnetic semiconductors)  
  75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)  
  75.70.Ak (Magnetic properties of monolayers and thin films)  
  81.15.Fg (Pulsed laser ablation deposition)  

Cite this article: 

Peng Ying-Zi(彭英姿),Thomas Liew,Song Wen-Dong, and Chong Tow Chong Comparative studies on Zn0.95Co0.05O thin films on C- and R-sapphire substrates 2009 Chin. Phys. B 18 5501

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