Journal
JOURNAL OF CRYSTAL GROWTH
Volume 307, Issue 1, Pages 14-18Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jcrysgro.2007.05.050
Keywords
X-ray absorption spectroscopy; physical vapor deposition; Co-doped ZnO; diluted magnetic semiconductors
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Highly (002)-orientated Zn0.95Co0.050 and Al-doped Zn0.95Co0.05O films were prepared by using inductively coupled plasma enhanced physical vapor deposition method. X-ray absorption spectroscopy and X-ray photoelectron spectroscopy confirmed that tetrahedrally coordinated Co2+ ions substituted for partial Zn2+ ions without changing wurtzite structure. Zn0.95Co0.05O film showed paramagnetic behavior even at 5 K while room-temperature ferromagnetism was observed in Al-doped Zn0.95Co0.05O films. It is demonstrated experimentally that the intentional donor doping plays an important role in realizing dominant ferromagnetic ordering in Co-doped ZnO films. (C) 2007 Elsevier B.V. All rights reserved.
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