Direct Kinetic Correlation of Carriers and Ferromagnetism in Co[superscript 2+]:ZnO
- UWASH
The hypothesis that high-Curie-temperature ferromagnetism in cobalt-doped ZnO (Co{sup 2+}:ZnO) is mediated by charge carriers was tested by controlled introduction and removal of the shallow donor interstitial zinc. Using oriented epitaxial Co{sup 2+}: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 Co{sup 2+}:ZnO and, in the process, unambiguously reveal this ferromagnetism to be dependent upon charge carriers. The distinction between defect-bound and free carriers in Co{sup 2+}:ZnO is discussed.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1007724
- Journal Information:
- Phys. Rev. Lett., Vol. 97, Issue 2006; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- ENGLISH
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