Highly spin-polarized carbon-based spinterfaces
We deploy topographical and spectroscopic techniques to show that a strongly spin-polarized interface arises between ferromagnetic cobalt and an amorphous carbon layer. Scanning tunneling microscopy and spectroscopy show how a semiconducting carbon film with a low band gap of about 0.4eV is formed a...
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| Veröffentlicht in: | Carbon (New York) 2015-06, Vol.87, p.269-274 |
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| creator | Djeghloul, F. Garreau, G. Gruber, M. Joly, L. Boukari, S. Arabski, J. Bulou, H. Scheurer, F. Hallal, A. Bertran, F. Le Fèvre, P. Taleb-Ibrahimi, A. Wulfhekel, W. Beaurepaire, E. Hajjar-Garreau, S. Wetzel, P. Bowen, M. Weber, W. |
| description | We deploy topographical and spectroscopic techniques to show that a strongly spin-polarized interface arises between ferromagnetic cobalt and an amorphous carbon layer. Scanning tunneling microscopy and spectroscopy show how a semiconducting carbon film with a low band gap of about 0.4eV is formed atop the metallic interface. To understand how the cobalt/carbon interface is formed, we used X-ray photoemission spectroscopy to study the hybridization state of carbon. We find that the semiconducting layer consists mainly of sp2-bonded carbon atoms with a sp2-to-sp3 ratio between 1.4 and 1.8. The spin-polarized properties of the cobalt/carbon interface are studied by spin-resolved photoemission spectroscopy. We observe interface states close to the Fermi energy that are not exclusive to cobalt. These electronic states reveal a high degree of spin polarization at room temperature. |
| doi_str_mv | 10.1016/j.carbon.2015.02.043 |
| format | Article |
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Scanning tunneling microscopy and spectroscopy show how a semiconducting carbon film with a low band gap of about 0.4eV is formed atop the metallic interface. To understand how the cobalt/carbon interface is formed, we used X-ray photoemission spectroscopy to study the hybridization state of carbon. We find that the semiconducting layer consists mainly of sp2-bonded carbon atoms with a sp2-to-sp3 ratio between 1.4 and 1.8. The spin-polarized properties of the cobalt/carbon interface are studied by spin-resolved photoemission spectroscopy. We observe interface states close to the Fermi energy that are not exclusive to cobalt. 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Scanning tunneling microscopy and spectroscopy show how a semiconducting carbon film with a low band gap of about 0.4eV is formed atop the metallic interface. To understand how the cobalt/carbon interface is formed, we used X-ray photoemission spectroscopy to study the hybridization state of carbon. We find that the semiconducting layer consists mainly of sp2-bonded carbon atoms with a sp2-to-sp3 ratio between 1.4 and 1.8. The spin-polarized properties of the cobalt/carbon interface are studied by spin-resolved photoemission spectroscopy. We observe interface states close to the Fermi energy that are not exclusive to cobalt. These electronic states reveal a high degree of spin polarization at room temperature.</description><subject>Band spectra</subject><subject>Carbon</subject><subject>Cobalt</subject><subject>Fermi surfaces</subject><subject>Ferromagnetism</subject><subject>Photoelectron spectroscopy</subject><subject>Physics</subject><subject>Scanning tunneling microscopy</subject><subject>Spectroscopy</subject><subject>X-rays</subject><issn>0008-6223</issn><issn>1873-3891</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNp9UMtOwzAQtBBIlMIfcOgRDknXjzrJBamqKEWqxKV3y7E31FWaBDutVL4eR0EcOa1md2ZWM4Q8UkgpUDk_pEb7sm1SBnSRAktB8CsyoXnGE54X9JpMACBPJGP8ltyFcIhQ5FRMyHzjPvf1ZRY61yRdW2vvvtHORr-k1CGC4dajr7TBcE9uKl0HfPidU7Jbv-5Wm2T78fa-Wm4TI3jRJ4ZZwQ0KtMKUaKUQ1YJJgRU3GtBqC7jAAmQhM2syQ3Vega0yngtdohR8Sp5H272uVefdUfuLarVTm-VWDTsQjLFcFmcauU8jt_Pt1wlDr44uGKxr3WB7CopmQCHLYuRIFSPV-DYEj9WfNwU1VKkOaoyuhioVsPiIR9nLKMOY-OzQq2AcNgat82h6ZVv3v8EPM_5-Mg</recordid><startdate>20150601</startdate><enddate>20150601</enddate><creator>Djeghloul, F.</creator><creator>Garreau, G.</creator><creator>Gruber, M.</creator><creator>Joly, L.</creator><creator>Boukari, S.</creator><creator>Arabski, J.</creator><creator>Bulou, H.</creator><creator>Scheurer, F.</creator><creator>Hallal, A.</creator><creator>Bertran, F.</creator><creator>Le Fèvre, P.</creator><creator>Taleb-Ibrahimi, A.</creator><creator>Wulfhekel, W.</creator><creator>Beaurepaire, E.</creator><creator>Hajjar-Garreau, S.</creator><creator>Wetzel, P.</creator><creator>Bowen, M.</creator><creator>Weber, W.</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0002-1665-2148</orcidid><orcidid>https://orcid.org/0000-0001-9800-8059</orcidid><orcidid>https://orcid.org/0000-0002-2416-0514</orcidid><orcidid>https://orcid.org/0000-0002-3873-2456</orcidid></search><sort><creationdate>20150601</creationdate><title>Highly spin-polarized carbon-based spinterfaces</title><author>Djeghloul, F. ; 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| subjects | Band spectra Carbon Cobalt Fermi surfaces Ferromagnetism Photoelectron spectroscopy Physics Scanning tunneling microscopy Spectroscopy X-rays |
| title | Highly spin-polarized carbon-based spinterfaces |
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