Defect induced ferromagnetism in Co-doped ZnO thin films
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. Magnetization measurements performed at different temperatures indicate ferromagnetic and paramagnetic behavior for the samples prepared...
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| Veröffentlicht in: | Journal of physics. Conference series 2008-03, Vol.100 (4), p.042034 |
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| creator | Fonin, M Mayer, G Biegger, E Janßen, N Beyer, M Thomay, T Bratschitsch, R Dedkov, Y S Rüdiger, U |
| description | 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. 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. 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+ (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. |
| doi_str_mv | 10.1088/1742-6596/100/4/042034 |
| format | Article |
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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. 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+ (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.</description><identifier>ISSN: 1742-6596</identifier><identifier>ISSN: 1742-6588</identifier><identifier>EISSN: 1742-6596</identifier><identifier>DOI: 10.1088/1742-6596/100/4/042034</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Cobalt ; Crystal defects ; Electronic structure ; Ferromagnetism ; Lattice vacancies ; Line shape ; Line spectra ; Magnetic properties ; Magnetron sputtering ; Optical properties ; Oxygen ; Physics ; Spectrum analysis ; Thin films ; X ray absorption ; Zinc oxide</subject><ispartof>Journal of physics. 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Conference series</title><description>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. 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. 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+ (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.</description><subject>Cobalt</subject><subject>Crystal defects</subject><subject>Electronic structure</subject><subject>Ferromagnetism</subject><subject>Lattice vacancies</subject><subject>Line shape</subject><subject>Line spectra</subject><subject>Magnetic properties</subject><subject>Magnetron sputtering</subject><subject>Optical properties</subject><subject>Oxygen</subject><subject>Physics</subject><subject>Spectrum analysis</subject><subject>Thin films</subject><subject>X ray absorption</subject><subject>Zinc oxide</subject><issn>1742-6596</issn><issn>1742-6588</issn><issn>1742-6596</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNp9UE1PwzAMjRBIjMFfQJU4lzqfS45owECatAtcuEQhTaDT2pSkO_DvSVUEHCZ8sf38nm09hC4xXGOQssILRkrBlagwQMUqYAQoO0Kzn8Hxn_oUnaW0BaA5FjMkb513diiart5bVxfexRha89a5oUlthotlKOvQ59FLtymG94z4Ztemc3TizS65i-88R8_3d0_Lh3K9WT0ub9alZRIPZS0E4cKqRc2sV9JYLKWgEuDVOCcUSEMkVd6Ao0Y6ZwgjinPCgVuDgXo6R1fT3j6Gj71Lg96GfezySU24BKoYxSSzxMSyMaQUndd9bFoTPzUGPbqkRwP0aEBuQTM9uZSF5SRsQv-rOcjVfT2-gw_w_7_xBUGzdGk</recordid><startdate>20080301</startdate><enddate>20080301</enddate><creator>Fonin, M</creator><creator>Mayer, G</creator><creator>Biegger, E</creator><creator>Janßen, N</creator><creator>Beyer, M</creator><creator>Thomay, T</creator><creator>Bratschitsch, R</creator><creator>Dedkov, Y S</creator><creator>Rüdiger, U</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>H8D</scope><scope>HCIFZ</scope><scope>L7M</scope><scope>P5Z</scope><scope>P62</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope></search><sort><creationdate>20080301</creationdate><title>Defect induced ferromagnetism in Co-doped ZnO thin films</title><author>Fonin, M ; Mayer, G ; Biegger, E ; Janßen, N ; Beyer, M ; Thomay, T ; Bratschitsch, R ; Dedkov, Y S ; Rüdiger, U</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c481t-d66256c97d4cf98ac18863800baee6908a2839fa0e3a8eea2429552505ca103f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Cobalt</topic><topic>Crystal defects</topic><topic>Electronic structure</topic><topic>Ferromagnetism</topic><topic>Lattice vacancies</topic><topic>Line shape</topic><topic>Line spectra</topic><topic>Magnetic properties</topic><topic>Magnetron sputtering</topic><topic>Optical properties</topic><topic>Oxygen</topic><topic>Physics</topic><topic>Spectrum analysis</topic><topic>Thin films</topic><topic>X ray absorption</topic><topic>Zinc oxide</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fonin, M</creatorcontrib><creatorcontrib>Mayer, G</creatorcontrib><creatorcontrib>Biegger, E</creatorcontrib><creatorcontrib>Janßen, N</creatorcontrib><creatorcontrib>Beyer, M</creatorcontrib><creatorcontrib>Thomay, T</creatorcontrib><creatorcontrib>Bratschitsch, R</creatorcontrib><creatorcontrib>Dedkov, Y S</creatorcontrib><creatorcontrib>Rüdiger, U</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni)</collection><collection>ProQuest Central</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central</collection><collection>Aerospace Database</collection><collection>SciTech Premium Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><jtitle>Journal of physics. Conference series</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Fonin, M</au><au>Mayer, G</au><au>Biegger, E</au><au>Janßen, N</au><au>Beyer, M</au><au>Thomay, T</au><au>Bratschitsch, R</au><au>Dedkov, Y S</au><au>Rüdiger, U</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Defect induced ferromagnetism in Co-doped ZnO thin films</atitle><jtitle>Journal of physics. Conference series</jtitle><date>2008-03-01</date><risdate>2008</risdate><volume>100</volume><issue>4</issue><spage>042034</spage><pages>042034-</pages><issn>1742-6596</issn><issn>1742-6588</issn><eissn>1742-6596</eissn><abstract>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. 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. 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+ (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.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><doi>10.1088/1742-6596/100/4/042034</doi><oa>free_for_read</oa></addata></record> |
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| source | IOP_英国物理学会OA刊 |
| subjects | Cobalt Crystal defects Electronic structure Ferromagnetism Lattice vacancies Line shape Line spectra Magnetic properties Magnetron sputtering Optical properties Oxygen Physics Spectrum analysis Thin films X ray absorption Zinc oxide |
| title | Defect induced ferromagnetism in Co-doped ZnO thin films |
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