High spin polarization induced by the interface hybridization in Co/C composite films
Co/C composite films with 10at.% Co were fabricated by facing-target sputtering and postannealed in vacuum at 300–650°C for 1.5h. Co nanoparticles are dispersed in amorphous carbon matrix and Co–C compounds exist at the interface between Co nanoparticles and carbon matrix. Negative magnetoresistance...
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| Veröffentlicht in: | Carbon (New York) 2012-10, Vol.50 (12), p.4470-4475 |
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| creator | Fan, Z.W. Li, P. Jiang, E.Y. Bai, H.L. |
| description | Co/C composite films with 10at.% Co were fabricated by facing-target sputtering and postannealed in vacuum at 300–650°C for 1.5h. Co nanoparticles are dispersed in amorphous carbon matrix and Co–C compounds exist at the interface between Co nanoparticles and carbon matrix. Negative magnetoresistance was observed in the Co/C films and its maximum value of −19% was measured at 3.98×106A/m and 5K for the as-deposited film. Besides cotunneling effect, higher interfacial spin polarization, which is probably induced by the hybridization between Co 3d and C 2p electrons and consequently the preferred d-electron conduction and interfacial spin-filtering effect, also contributes to the large negative magnetoresistance. Postannealing treatment damages the interface hybridization, and thus leads to the disappearance of the higher interfacial spin polarization and large negative magnetoresistance. |
| doi_str_mv | 10.1016/j.carbon.2012.05.025 |
| format | Article |
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Co nanoparticles are dispersed in amorphous carbon matrix and Co–C compounds exist at the interface between Co nanoparticles and carbon matrix. Negative magnetoresistance was observed in the Co/C films and its maximum value of −19% was measured at 3.98×106A/m and 5K for the as-deposited film. Besides cotunneling effect, higher interfacial spin polarization, which is probably induced by the hybridization between Co 3d and C 2p electrons and consequently the preferred d-electron conduction and interfacial spin-filtering effect, also contributes to the large negative magnetoresistance. Postannealing treatment damages the interface hybridization, and thus leads to the disappearance of the higher interfacial spin polarization and large negative magnetoresistance.</description><identifier>ISSN: 0008-6223</identifier><identifier>EISSN: 1873-3891</identifier><identifier>DOI: 10.1016/j.carbon.2012.05.025</identifier><identifier>CODEN: CRBNAH</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Carbon ; Carbon-carbon composites ; Chemistry ; Cobalt ; Colloidal state and disperse state ; Cross-disciplinary physics: materials science; rheology ; Damage ; Exact sciences and technology ; Fullerenes and related materials; diamonds, graphite ; General and physical chemistry ; Magnetoresistance ; Magnetoresistivity ; Materials science ; Nanoparticles ; Physical and chemical studies. Granulometry. Electrokinetic phenomena ; Physics ; Polarization ; Specific materials ; Sputtering ; Surface physical chemistry</subject><ispartof>Carbon (New York), 2012-10, Vol.50 (12), p.4470-4475</ispartof><rights>2012 Elsevier Ltd</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c402t-2de539e3ae93c2f908ad95ba6d9657aa14c4c05536d3084e5d60f758531324893</citedby><cites>FETCH-LOGICAL-c402t-2de539e3ae93c2f908ad95ba6d9657aa14c4c05536d3084e5d60f758531324893</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S000862231200454X$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26160369$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Fan, Z.W.</creatorcontrib><creatorcontrib>Li, P.</creatorcontrib><creatorcontrib>Jiang, E.Y.</creatorcontrib><creatorcontrib>Bai, H.L.</creatorcontrib><title>High spin polarization induced by the interface hybridization in Co/C composite films</title><title>Carbon (New York)</title><description>Co/C composite films with 10at.% Co were fabricated by facing-target sputtering and postannealed in vacuum at 300–650°C for 1.5h. Co nanoparticles are dispersed in amorphous carbon matrix and Co–C compounds exist at the interface between Co nanoparticles and carbon matrix. Negative magnetoresistance was observed in the Co/C films and its maximum value of −19% was measured at 3.98×106A/m and 5K for the as-deposited film. Besides cotunneling effect, higher interfacial spin polarization, which is probably induced by the hybridization between Co 3d and C 2p electrons and consequently the preferred d-electron conduction and interfacial spin-filtering effect, also contributes to the large negative magnetoresistance. Postannealing treatment damages the interface hybridization, and thus leads to the disappearance of the higher interfacial spin polarization and large negative magnetoresistance.</description><subject>Carbon</subject><subject>Carbon-carbon composites</subject><subject>Chemistry</subject><subject>Cobalt</subject><subject>Colloidal state and disperse state</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Damage</subject><subject>Exact sciences and technology</subject><subject>Fullerenes and related materials; diamonds, graphite</subject><subject>General and physical chemistry</subject><subject>Magnetoresistance</subject><subject>Magnetoresistivity</subject><subject>Materials science</subject><subject>Nanoparticles</subject><subject>Physical and chemical studies. Granulometry. Electrokinetic phenomena</subject><subject>Physics</subject><subject>Polarization</subject><subject>Specific materials</subject><subject>Sputtering</subject><subject>Surface physical chemistry</subject><issn>0008-6223</issn><issn>1873-3891</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqFkE1LAzEQhoMoWKv_wEMugpfd5rvZiyBFrVDwYs8hTWZtynazJluh_nq3VPSmp2HgeecdHoSuKSkpoWqyKZ1Nq9iWjFBWElkSJk_QiOopL7iu6CkaEUJ0oRjj5-gi582wCk3FCC3n4W2Ncxda3MXGpvBp-xBbHFq_c-Dxao_7NQxrD6m2DvB6v0rB_2J4Ficz7OK2izn0gOvQbPMlOqttk-Hqe47R8vHhdTYvFi9Pz7P7ReEEYX3BPEheAbdQccfqimjrK7myyldKTq2lwglHpOTKc6IFSK9IPZVacsqZ0BUfo9vj3S7F9x3k3mxDdtA0toW4y4ZKQQWfci7-R7mohBp69YCKI-pSzDlBbboUtjbtDSXmINxszFG4OQg3RJpB-BC7-W6w2dmmTrZ1If9kmaKKcHV4-u7IwWDmI0Ay2QVoB9shgeuNj-Hvoi-q45ca</recordid><startdate>20121001</startdate><enddate>20121001</enddate><creator>Fan, Z.W.</creator><creator>Li, P.</creator><creator>Jiang, E.Y.</creator><creator>Bai, H.L.</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20121001</creationdate><title>High spin polarization induced by the interface hybridization in Co/C composite films</title><author>Fan, Z.W. ; Li, P. ; Jiang, E.Y. ; Bai, H.L.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c402t-2de539e3ae93c2f908ad95ba6d9657aa14c4c05536d3084e5d60f758531324893</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Carbon</topic><topic>Carbon-carbon composites</topic><topic>Chemistry</topic><topic>Cobalt</topic><topic>Colloidal state and disperse state</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Damage</topic><topic>Exact sciences and technology</topic><topic>Fullerenes and related materials; diamonds, graphite</topic><topic>General and physical chemistry</topic><topic>Magnetoresistance</topic><topic>Magnetoresistivity</topic><topic>Materials science</topic><topic>Nanoparticles</topic><topic>Physical and chemical studies. Granulometry. Electrokinetic phenomena</topic><topic>Physics</topic><topic>Polarization</topic><topic>Specific materials</topic><topic>Sputtering</topic><topic>Surface physical chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fan, Z.W.</creatorcontrib><creatorcontrib>Li, P.</creatorcontrib><creatorcontrib>Jiang, E.Y.</creatorcontrib><creatorcontrib>Bai, H.L.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Carbon (New York)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Fan, Z.W.</au><au>Li, P.</au><au>Jiang, E.Y.</au><au>Bai, H.L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High spin polarization induced by the interface hybridization in Co/C composite films</atitle><jtitle>Carbon (New York)</jtitle><date>2012-10-01</date><risdate>2012</risdate><volume>50</volume><issue>12</issue><spage>4470</spage><epage>4475</epage><pages>4470-4475</pages><issn>0008-6223</issn><eissn>1873-3891</eissn><coden>CRBNAH</coden><abstract>Co/C composite films with 10at.% Co were fabricated by facing-target sputtering and postannealed in vacuum at 300–650°C for 1.5h. Co nanoparticles are dispersed in amorphous carbon matrix and Co–C compounds exist at the interface between Co nanoparticles and carbon matrix. Negative magnetoresistance was observed in the Co/C films and its maximum value of −19% was measured at 3.98×106A/m and 5K for the as-deposited film. Besides cotunneling effect, higher interfacial spin polarization, which is probably induced by the hybridization between Co 3d and C 2p electrons and consequently the preferred d-electron conduction and interfacial spin-filtering effect, also contributes to the large negative magnetoresistance. Postannealing treatment damages the interface hybridization, and thus leads to the disappearance of the higher interfacial spin polarization and large negative magnetoresistance.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.carbon.2012.05.025</doi><tpages>6</tpages></addata></record> |
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| subjects | Carbon Carbon-carbon composites Chemistry Cobalt Colloidal state and disperse state Cross-disciplinary physics: materials science rheology Damage Exact sciences and technology Fullerenes and related materials diamonds, graphite General and physical chemistry Magnetoresistance Magnetoresistivity Materials science Nanoparticles Physical and chemical studies. Granulometry. Electrokinetic phenomena Physics Polarization Specific materials Sputtering Surface physical chemistry |
| title | High spin polarization induced by the interface hybridization in Co/C composite films |
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