Defect-induced ferromagnetism in Co-doped ZnO thin films

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FONIN, Mikhail, Gillian KILIANI, Erwin BIEGGER, Nils JANSSEN, Markus BEYER, Tim THOMAY, Rudolf BRATSCHITSCH, Yuriy S. DEDKOV, Ulrich RÜDIGER, 2008. Defect-induced ferromagnetism in Co-doped ZnO thin films. In: Journal of Physics: Conference Series. 100(4), pp. 042034. eISSN 1742-6596. Available under: doi: 10.1088/1742-6596/100/4/042034

@article{Fonin2008Defec-9236, title={Defect-induced ferromagnetism in Co-doped ZnO thin films}, year={2008}, doi={10.1088/1742-6596/100/4/042034}, number={4}, volume={100}, journal={Journal of Physics: Conference Series}, author={Fonin, Mikhail and Kiliani, Gillian and Biegger, Erwin and Janßen, Nils and Beyer, Markus and Thomay, Tim and Bratschitsch, Rudolf and Dedkov, Yuriy S. and Rüdiger, Ulrich}, note={Article Number: 42034} }

eng Biegger, Erwin Dedkov, Yuriy S. Biegger, Erwin deposit-license Thomay, Tim Thomay, Tim 2011-03-24T17:54:46Z We present a study on the structural, magnetic, and optical properties, as well as the electronic structure of Co-doped ZnO films prepared by magnetron sputtering.<br />Magnetization measurements performed at different temperatures indicate ferromagnetic and paramagnetic behavior for the samples prepared at oxygen-poor conditions whereas the samples prepared at oxygen-rich conditions show only paramagnetic behavior corroborating that the presence of oxygen-related defects is essential for ferromagnetism in Zn1−xCoxO. Xray absorption spectroscopy (XAS) at the Co L2,3 edge together with optical transmittance measurements show that Co ions are present in the high-spin Co2+ (d7) state under tetrahedral symmetry indicating a proper incorporation in the ZnO host lattice. Comparison of the O K edge XAS spectra of the samples prepared at different conditions show substantial changes in the spectral line shape which are attributed to the presence of lattice defects such as oxygen vacancies in the ferromagnetic oxygen-poor Co-doped ZnO samples. Our findings indicate that the ferromagnetic properties of Co-doped ZnO samples are strongly correlated with the presence of oxygen vacancies in the ZnO lattice supporting the spin-split impurity band model. 2008 Fonin, Mikhail Fonin, Mikhail Beyer, Markus Janßen, Nils Defect-induced ferromagnetism in Co-doped ZnO thin films Dedkov, Yuriy S. Rüdiger, Ulrich First publ. in: Journal of physics / Conference Series 100 (2008), 042034 Kiliani, Gillian 2011-03-24T17:54:46Z Beyer, Markus Bratschitsch, Rudolf Bratschitsch, Rudolf application/pdf Kiliani, Gillian Janßen, Nils Rüdiger, Ulrich

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