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Ferromagnetism in epitaxial Zn<sub>0.95</sub>Co<sub>0.05</sub>O films grown on ZnO and Al<sub>2</sub>O<sub>3</sub>

Ferromagnetism in epitaxial Zn0.95Co0.05O films grown on ZnO and Al2O3

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NIELSEN, Karl, Sebastian BAUER, Maike LÜBBE, Sebastian T. B. GÖNNENWEIN, Matthias OPEL, Jürgen SIMON, Werner MADER, Rudolf GROSS, 2006. Ferromagnetism in epitaxial Zn0.95Co0.05O films grown on ZnO and Al2O3. In: Physica Status Solidi (A) - Applications and Materials Science. Wiley. 203(14), pp. 3581-3596. ISSN 0031-8965. eISSN 1521-396X. Available under: doi: 10.1002/pssa.200622383

@article{Nielsen2006Ferro-53541, title={Ferromagnetism in epitaxial Zn0.95Co0.05O films grown on ZnO and Al2O3}, year={2006}, doi={10.1002/pssa.200622383}, number={14}, volume={203}, issn={0031-8965}, journal={Physica Status Solidi (A) - Applications and Materials Science}, pages={3581--3596}, author={Nielsen, Karl and Bauer, Sebastian and Lübbe, Maike and Gönnenwein, Sebastian T. B. and Opel, Matthias and Simon, Jürgen and Mader, Werner and Gross, Rudolf} }

Opel, Matthias Gross, Rudolf 2006 Mader, Werner Nielsen, Karl Gönnenwein, Sebastian T. B. Lübbe, Maike Bauer, Sebastian Nielsen, Karl Mader, Werner eng Simon, Jürgen Opel, Matthias Bauer, Sebastian Gross, Rudolf 2021-04-29T13:37:17Z Gönnenwein, Sebastian T. B. terms-of-use 2021-04-29T13:37:17Z Lübbe, Maike In this article, the possible mechanisms resulting in strong ferromagnetic coupling in transition metal(TM)‐doped ZnO and other diluted magnetic semiconductors (DMS) are reviewed and the prerequisites for the observation of room temperature ferromagnetism in TM‐doped ZnO are defined. In order to study the ferromagnetic behavior we have grown epitaxial Zn<sub>0.95</sub>Co<sub>0.05</sub>O films simultaneously on (0001) ZnO and Al<sub>2</sub>O<sub>3</sub> substrates by laser molecular beam epitaxy at different deposition temperatures. A systematic study of the structural and magnetic properties has been performed to reveal their interdependence. Room temperature ferromagnetism has been found in Zn<sub>0.95</sub>Co<sub>0.05</sub>O films grown on ZnO, whereas for films deposited on sapphire only weak ferromagnetic signals have been detected which could not unambiguously be separated from those of the substrate. The different behavior is explained by different structural properties and defect densities in both films. Our experimental findings are in good agreement with a spin split impurity band model, where strong ferromagnetic exchange in ZnO:Co2+ is obtained by a strong hybridization between the magnetic Co<sup>2+</sup> ion states and the donor states due to a large density of native defects. Simon, Jürgen Ferromagnetism in epitaxial Zn<sub>0.95</sub>Co<sub>0.05</sub>O films grown on ZnO and Al<sub>2</sub>O<sub>3</sub>

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