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2009 | 115 | 1 | 263-265
Article title

Defect-Related Origin of the Ferromagnetism in ZnO:Co

Content
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Languages of publication
EN
Abstracts
EN
In recent years transition metal ion doped ZnO has been the focus of intense scientific enquiry. ZnO:Co is by far the most studied member of this family. However, despite the many experimental claims for ferromagnetism, a definitive theoretical explanation for long range magnetic interaction has so far been lacking. Here we present a mechanism which describes not only the origin of this previously inexplicable magnetism but also explains the experimental findings to date and in addition, suggests a recipe for tailoring the magnetic properties. We demonstrate that the magnetism originates from a Co^{2+} oxygen vacancy pair with a partially filled level close to the ZnO conduction band minimum. The long range coupling then occurs via conduction electrons at moderate n doping. This however is not sufficient for room temperature ferromagnetism due to the prohibitive concentrations of O vacancies needed. The experimental findings may then be explained by a combination of our proposed mechanism and the formation of blocked superparamagnetic clusters.
Keywords
EN
Year
Volume
115
Issue
1
Pages
263-265
Physical description
Dates
published
2009-01
References
  • 1. K. Ueda, H. Tabata, T. Kawai, Appl. Phys. Lett. 79, 988 (2001)
  • 2. C.D. Pemmaraju, R. Hanafin, T. Archer, H.B. Braun, S. Sanvito, Phys. Rev. B 78, 054428 (2008)
  • 3. C. Das Pemmaraju, T. Archer, D. Sánchez-Portal, S. Sanvito, Phys. Rev. B 75, 045101 (2007)
  • 4. R. Hanafin, C.D. Pemmaraju, T. Archer, S. Sanvito, to be published
  • 5. P. Sati, R. Hayn, R. Kuzian, S. Régnier, S. Schäfer, A. Stepanov, C. Morhain, C. Deparis, M. Laügt, M. Goiran, Z. Golacki, Phys. Rev. Lett. 96, 017203 (2006)
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv115n1073kz
Identifiers
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