Co-metal clustering as the origin of ferromagnetism in Co-doped ZnO thin films
SCIE
SCOPUS
- Title
- Co-metal clustering as the origin of ferromagnetism in Co-doped ZnO thin films
- Authors
- Park, JH; Kim, MG; Jang, HM; Ryu, S; Kim, YM
- Date Issued
- 2004-02-23
- Publisher
- AMER INST PHYSICS
- Abstract
- The origin of ferromagnetism in ZnO-based systems was investigated using Co-doped ZnO thin films as prototypical examples of II-VI-based diluted magnetic semiconductors. In spite of the atomic-scale dissolution of Co ions in wurtzite ZnO, both the magnetization-temperature curve and the magnetization-field curve demonstrated that Zn1-xCoxO thin films were paramagnetic for xless than or equal to0.12. On the other hand, Zn1-xCoxO films with x greater than 0.12 were characterized by the Co-metal clustering and apparently showed room-temperature ferromagnetism. The discrepancy between the zero-field cooling and the field cooling curves further indicates that Co-doped ZnO films (for x>0.12) are superparamagnetic and the observed ferromagnetism originates from the nanometer-sized Co clusters. (C) 2004 American Institute of Physics.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/9478
- DOI
- 10.1063/1.1650915
- ISSN
- 0003-6951
- Article Type
- Article
- Citation
- APPLIED PHYSICS LETTERS, vol. 84, no. 8, page. 1338 - 1340, 2004-02-23
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