Direct kinetic correlation of carriers and ferromagnetism in Co2+: ZnO |
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Authors: | Kittilstved Kevin R Schwartz Dana A Tuan Allan C Heald Steve M Chambers Scott A Gamelin Daniel R |
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Institution: | Department of Chemistry, University of Washington, Seattle, Washington, 98195, USA. |
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Abstract: | 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. |
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