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Defect induced low temperature ferromagnetism in Zn1-xCoxO films

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BIEGGER, Erwin, Mikhail FONIN, Ulrich RÜDIGER, Nils JANSSEN, Markus BEYER, Tim THOMAY, Rudolf BRATSCHITSCH, Yuriy S. DEDKOV, 2007. Defect induced low temperature ferromagnetism in Zn1-xCoxO films. In: Journal of Applied Physics. 101, 73904. Available under: doi: 10.1063/1.2713935

@article{Biegger2007Defec-8959, title={Defect induced low temperature ferromagnetism in Zn1-xCoxO films}, year={2007}, doi={10.1063/1.2713935}, volume={101}, journal={Journal of Applied Physics}, author={Biegger, Erwin and Fonin, Mikhail and Rüdiger, Ulrich and Janßen, Nils and Beyer, Markus and Thomay, Tim and Bratschitsch, Rudolf and Dedkov, Yuriy S.}, note={Article Number: 73904} }

<rdf:RDF xmlns:dcterms="" xmlns:dc="" xmlns:rdf="" xmlns:bibo="" xmlns:dspace="" xmlns:foaf="" xmlns:void="" xmlns:xsd="" > <rdf:Description rdf:about=""> <dcterms:isPartOf rdf:resource=""/> <dc:format>application/pdf</dc:format> <dc:contributor>Beyer, Markus</dc:contributor> <dc:creator>Janßen, Nils</dc:creator> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <dcterms:issued>2007</dcterms:issued> <dc:contributor>Biegger, Erwin</dc:contributor> <dc:creator>Dedkov, Yuriy S.</dc:creator> <dc:rights>Attribution-NonCommercial-NoDerivs 2.0 Generic</dc:rights> <dcterms:title>Defect induced low temperature ferromagnetism in Zn1-xCoxO films</dcterms:title> <dc:contributor>Fonin, Mikhail</dc:contributor> <dc:contributor>Janßen, Nils</dc:contributor> <dcterms:hasPart rdf:resource=""/> <dc:creator>Beyer, Markus</dc:creator> <dc:creator>Biegger, Erwin</dc:creator> <dspace:isPartOfCollection rdf:resource=""/> <dc:creator>Rüdiger, Ulrich</dc:creator> <dspace:hasBitstream rdf:resource=""/> <dc:creator>Fonin, Mikhail</dc:creator> <bibo:uri rdf:resource=""/> <dc:language>eng</dc:language> <dcterms:rights rdf:resource=""/> <dc:contributor>Rüdiger, Ulrich</dc:contributor> <dc:creator>Thomay, Tim</dc:creator> <dc:contributor>Thomay, Tim</dc:contributor> <dcterms:abstract xml:lang="eng">We present a detailed study on the structural, magnetic, and optical properties, as well as the electronic structure of epitaxial Co-doped ZnO films prepared by magnetron sputtering. Different preparation conditions were implemented in order to control the concentration of oxygen vacancies in the ZnO host lattice. Magnetization measurements indicate ferromagnetic behavior at low temperature for samples prepared at oxygen-poor conditions whereas the samples prepared at oxygen-rich conditions show extremely small ferromagnetic signal corroborating that ferromagnetism in Zn1−xCoxO correlates with the presence of the oxygen-related defects. X-ray 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+ (d^7) 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.</dcterms:abstract> <dcterms:available rdf:datatype="">2011-03-24T17:52:24Z</dcterms:available> <dcterms:bibliographicCitation>First publ. in: Journal of Applied Physics 101 (2007), 073904</dcterms:bibliographicCitation> <dc:contributor>Dedkov, Yuriy S.</dc:contributor> <dc:date rdf:datatype="">2011-03-24T17:52:24Z</dc:date> <dc:creator>Bratschitsch, Rudolf</dc:creator> <dcterms:isPartOf rdf:resource=""/> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dc:contributor>Bratschitsch, Rudolf</dc:contributor> <dspace:isPartOfCollection rdf:resource=""/> </rdf:Description> </rdf:RDF>

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