Room-temperature ferromagnetism of Cu-doped ZnO films probed by soft X-ray magnetic circular dichroism
We report direct evidence of room-temperature ferromagnetic ordering in O-deficient ZnO:Cu films by using soft x-ray magnetic circular dichroism and x-ray absorption. Our measurements have revealed unambiguously two distinct features of Cu atoms associated with (i) magnetically ordered Cu ions prese...
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| Veröffentlicht in: | Physical review letters 2010-11, Vol.105 (20), p.207201-207201, Article 207201 |
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| container_title | Physical review letters |
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| creator | Herng, T S Qi, D-C Berlijn, T Yi, J B Yang, K S Dai, Y Feng, Y P Santoso, I Sánchez-Hanke, C Gao, X Y Wee, Andrew T S Ku, W Ding, J Rusydi, A |
| description | We report direct evidence of room-temperature ferromagnetic ordering in O-deficient ZnO:Cu films by using soft x-ray magnetic circular dichroism and x-ray absorption. Our measurements have revealed unambiguously two distinct features of Cu atoms associated with (i) magnetically ordered Cu ions present only in the oxygen-deficient samples and (ii) magnetically disordered regular Cu2+ ions present in all the samples. We find that a sufficient amount of both oxygen vacancies (V(O)) and Cu impurities is essential to the observed ferromagnetism, and a non-negligible portion of Cu impurities is uninvolved in the magnetic order. Based on first-principles calculations, we propose a microscopic "indirect double-exchange" model, in which alignments of localized large moments of Cu in the vicinity of the V(O) are mediated by the large-sized vacancy orbitals. |
| doi_str_mv | 10.1103/physrevlett.105.207201 |
| format | Article |
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Our measurements have revealed unambiguously two distinct features of Cu atoms associated with (i) magnetically ordered Cu ions present only in the oxygen-deficient samples and (ii) magnetically disordered regular Cu2+ ions present in all the samples. We find that a sufficient amount of both oxygen vacancies (V(O)) and Cu impurities is essential to the observed ferromagnetism, and a non-negligible portion of Cu impurities is uninvolved in the magnetic order. Based on first-principles calculations, we propose a microscopic "indirect double-exchange" model, in which alignments of localized large moments of Cu in the vicinity of the V(O) are mediated by the large-sized vacancy orbitals.</description><identifier>ISSN: 0031-9007</identifier><identifier>EISSN: 1079-7114</identifier><identifier>DOI: 10.1103/physrevlett.105.207201</identifier><identifier>PMID: 21231259</identifier><language>eng</language><publisher>United States</publisher><subject>ABSORPTION ; ATOMS ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; FERROMAGNETISM ; IMPURITIES ; MAGNETIC CIRCULAR DICHROISM ; OXYGEN ; VACANCIES</subject><ispartof>Physical review letters, 2010-11, Vol.105 (20), p.207201-207201, Article 207201</ispartof><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c451t-9b0c8d9eb563f84441988de9f0ea49b10611827dcd91badd97279b2bd46ffca03</citedby><cites>FETCH-LOGICAL-c451t-9b0c8d9eb563f84441988de9f0ea49b10611827dcd91badd97279b2bd46ffca03</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,2863,2864,27901,27902</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/21231259$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttps://www.osti.gov/biblio/1000444$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Herng, T S</creatorcontrib><creatorcontrib>Qi, D-C</creatorcontrib><creatorcontrib>Berlijn, T</creatorcontrib><creatorcontrib>Yi, J B</creatorcontrib><creatorcontrib>Yang, K S</creatorcontrib><creatorcontrib>Dai, Y</creatorcontrib><creatorcontrib>Feng, Y P</creatorcontrib><creatorcontrib>Santoso, I</creatorcontrib><creatorcontrib>Sánchez-Hanke, C</creatorcontrib><creatorcontrib>Gao, X Y</creatorcontrib><creatorcontrib>Wee, Andrew T S</creatorcontrib><creatorcontrib>Ku, W</creatorcontrib><creatorcontrib>Ding, J</creatorcontrib><creatorcontrib>Rusydi, A</creatorcontrib><creatorcontrib>BROOKHAVEN NATIONAL LABORATORY (BNL)</creatorcontrib><title>Room-temperature ferromagnetism of Cu-doped ZnO films probed by soft X-ray magnetic circular dichroism</title><title>Physical review letters</title><addtitle>Phys Rev Lett</addtitle><description>We report direct evidence of room-temperature ferromagnetic ordering in O-deficient ZnO:Cu films by using soft x-ray magnetic circular dichroism and x-ray absorption. Our measurements have revealed unambiguously two distinct features of Cu atoms associated with (i) magnetically ordered Cu ions present only in the oxygen-deficient samples and (ii) magnetically disordered regular Cu2+ ions present in all the samples. We find that a sufficient amount of both oxygen vacancies (V(O)) and Cu impurities is essential to the observed ferromagnetism, and a non-negligible portion of Cu impurities is uninvolved in the magnetic order. 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Our measurements have revealed unambiguously two distinct features of Cu atoms associated with (i) magnetically ordered Cu ions present only in the oxygen-deficient samples and (ii) magnetically disordered regular Cu2+ ions present in all the samples. We find that a sufficient amount of both oxygen vacancies (V(O)) and Cu impurities is essential to the observed ferromagnetism, and a non-negligible portion of Cu impurities is uninvolved in the magnetic order. Based on first-principles calculations, we propose a microscopic "indirect double-exchange" model, in which alignments of localized large moments of Cu in the vicinity of the V(O) are mediated by the large-sized vacancy orbitals.</abstract><cop>United States</cop><pmid>21231259</pmid><doi>10.1103/physrevlett.105.207201</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Physical review letters, 2010-11, Vol.105 (20), p.207201-207201, Article 207201 |
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| source | American Physical Society Journals |
| subjects | ABSORPTION ATOMS CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY FERROMAGNETISM IMPURITIES MAGNETIC CIRCULAR DICHROISM OXYGEN VACANCIES |
| title | Room-temperature ferromagnetism of Cu-doped ZnO films probed by soft X-ray magnetic circular dichroism |
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