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Direct observation of half-metallicity in the Heusler compound Co2MnSi

Author

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  • M. Jourdan

    (Institut für Physik, Johannes Gutenberg-Universität)

  • J. Minár

    (Ludwig-Maximilians-Universität München
    New Technologies-Research Center, University of West Bohemia, Univerzitni 8)

  • J. Braun

    (Ludwig-Maximilians-Universität München)

  • A. Kronenberg

    (Institut für Physik, Johannes Gutenberg-Universität)

  • S. Chadov

    (Max-Planck-Institut für Chemische Physik fester Stoffe)

  • B. Balke

    (Institut für Anorganische und Analytische Chemie, Johannes Gutenberg-Universität)

  • A. Gloskovskii

    (Deutsches Elektronen-Synchrotron DESY)

  • M. Kolbe

    (Institut für Physik, Johannes Gutenberg-Universität)

  • H.J. Elmers

    (Institut für Physik, Johannes Gutenberg-Universität)

  • G. Schönhense

    (Institut für Physik, Johannes Gutenberg-Universität)

  • H. Ebert

    (Ludwig-Maximilians-Universität München)

  • C. Felser

    (Max-Planck-Institut für Chemische Physik fester Stoffe
    Institut für Anorganische und Analytische Chemie, Johannes Gutenberg-Universität)

  • M. Kläui

    (Institut für Physik, Johannes Gutenberg-Universität)

Abstract

Ferromagnetic thin films of Heusler compounds are highly relevant for spintronic applications owing to their predicted half-metallicity, that is, 100% spin polarization at the Fermi energy. However, experimental evidence for this property is scarce. Here we investigate epitaxial thin films of the compound Co2MnSi in situ by ultraviolet-photoemission spectroscopy, taking advantage of a novel multi-channel spin filter. By this surface sensitive method, an exceptionally large spin polarization of ( ) % at room temperature is observed directly. As a more bulk sensitive method, additional ex situ spin-integrated high energy X-ray photoemission spectroscopy experiments are performed. All experimental results are compared with advanced band structure and photoemission calculations which include surface effects. Excellent agreement is obtained with calculations, which show a highly spin polarized bulk-like surface resonance ingrained in a half metallic bulk band structure.

Suggested Citation

  • M. Jourdan & J. Minár & J. Braun & A. Kronenberg & S. Chadov & B. Balke & A. Gloskovskii & M. Kolbe & H.J. Elmers & G. Schönhense & H. Ebert & C. Felser & M. Kläui, 2014. "Direct observation of half-metallicity in the Heusler compound Co2MnSi," Nature Communications, Nature, vol. 5(1), pages 1-5, September.
  • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4974
    DOI: 10.1038/ncomms4974
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