Journal
PHYSICA B-CONDENSED MATTER
Volume 406, Issue 6-7, Pages 1341-1344Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2011.01.030
Keywords
Magnetic properties; ZnO nanostructured films; Crystal structure; Defects
Categories
Funding
- National Natural Science Foundation of China [50701003]
- MOST of China [2010CB833104]
- program for New Century Excellent Talents [NCET-10-1097]
- Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry
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The ZnO nanorod array films have been epitaxially deposited on indium tin oxide (ITO) glass along < 0001 > direction. It is found that the film is grown in a two-step process including nanoparticle film nucleation and oriented rod growth. The as-prepared ZnO film shows a dominant diamagnetic signal and a weak ferromagnetic signal at room temperature. The room temperature ferromagnetism deteriorated by annealing in air or N-2. The photoluminescent spectra revealed that the intensity of ZnO defect band decreases after annealing. Thus, the decreased ferromagnetism is likely to have resulted from the decrease of oxygen vacancies and defects in the as-prepared film. Moreover, ZnO deposited at various times showed that defects located at or near the interface between the substrate and the film play a major role in ferromagnetism. It suggests that ferromagnetism can be tuned by changing the defects in ZnO. (C) 2011 Elsevier B.V. All rights reserved.
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