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Direct Kinetic Correlation of Carriers and Ferromagnetism in Co2+:ZnO
Physical Review Letters (2006)
  • Kevin R. Kittilstved, University of Massachusetts - Amherst
  • D. A. Schwartz
  • A. C. Tuan
  • S. M Heald
  • S. A. Chambers
  • D. R. Gamelin

The hypothesis that high-Curie-temperature ferromagnetism in cobalt-doped ZnO (Co2+:  ZnO) is mediated by charge carriers was tested by controlled introduction and removal of the shallow donor interstitial zinc. Using oriented epitaxial Co2+:  ZnO films grown by chemical vapor deposition, kinetics measurements demonstrate a direct correlation between the oxidative quenching of ferromagnetism and the diffusion and oxidation of interstitial zinc. These results demonstrate controlled systematic variation of a key parameter involved in the ferromagnetism of Co2+:  ZnO and, in the process, unambiguously reveal this ferromagnetism to be dependent upon charge carriers. The distinction between defect-bound and free carriers in Co2+:  ZnO is discussed.

Publication Date
Publisher Statement
Copyright 2006 by The American Physical Society. Doi:10.1103/PhysRevLett.97.037203
Citation Information
Kevin R. Kittilstved, D. A. Schwartz, A. C. Tuan, S. M Heald, et al.. "Direct Kinetic Correlation of Carriers and Ferromagnetism in Co2+:ZnO" Physical Review Letters Vol. 97 Iss. 3 (2006)
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