Highly spin-polarized Dirac fermions at the graphene/Co interface

D. Marchenko, A. Varykhalov, J. Sánchez-Barriga, O. Rader, C. Carbone, and G. Bihlmayer
Phys. Rev. B 91, 235431 – Published 18 June 2015
PDFHTMLExport Citation

Abstract

The interface of graphene with ferromagnets is highly relevant for spintronics, because graphene on Co(0001) shows a largely intact Dirac cone and strong hybridization with Co 3d states breaking the sublattice symmetry that had been considered mutually exclusive. Here we show by spin- and angle-resolved photoemission that the Dirac cone and Dirac point are also highly spin polarized (25%), which reinforces the puzzling issue of a strong graphene-substrate interaction. The problem is solved by our ab initio calculations which show that (i) the upper and lower halves of the Dirac cone belong to different sublattices and (ii) one half is spin polarized by spin-dependent hybridization because it is situated at the edge of a minority-spin band gap of the Co substrate.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 18 February 2015
  • Revised 13 May 2015

DOI:https://doi.org/10.1103/PhysRevB.91.235431

©2015 American Physical Society

Authors & Affiliations

D. Marchenko*, A. Varykhalov, J. Sánchez-Barriga, and O. Rader

  • Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany

C. Carbone

  • Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Basovizza, 34149 Trieste, Italy

G. Bihlmayer

  • Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

  • *Present address: Physikalische und Theoretische Chemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany.

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 91, Iss. 23 — 15 June 2015

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×