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Highly spin-polarized carbon-based spinterfaces

Djeghloul, F.; Garreau, G.; Gruber, M.; Joly, L.; Boukari, S.; Arabski, J.; Bulou, H.; Scheurer, F.; Hallal, A.; Bertran, F.; Le Fevre, P.; Taleb-Ibrahimi, A.; Wulfhekel, W.; Beaurepaire, E.; Hajjar-Garreau, S.; Wetzel, P.; Bowen, M.; Weber, W.

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 0.4 eV 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. (C) 2015 Elsevier Ltd. All rights reserved.

DOI: 10.1016/j.carbon.2015.02.043
Zitationen: 18
Web of Science
Zitationen: 16
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 0008-6223
KITopen-ID: 1000053551
Erschienen in Carbon
Band 87
Seiten 269--274
Nachgewiesen in Web of Science
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