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  Direct observation of half-metallicity in the Heusler compound Co2MnSi

Jourdan, M., Minár, J., Braun, J., Kronenberg, A., Chadov, S., Balke, B., et al. (2014). Direct observation of half-metallicity in the Heusler compound Co2MnSi. Nature Communications, 5: 3974, pp. 1-5. doi:10.1038/ncomms4974.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-FC0F-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-FC11-E
Genre: Journal Article

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Jourdan, M.1, Author
Minár, J.1, Author
Braun, J.1, Author
Kronenberg, A.1, Author
Chadov, S.2, Author              
Balke, B.1, Author
Gloskovskii, A.1, Author
Kolbe, M.1, Author
Elmers, H. J.1, Author
Schönhense, G.1, Author
Ebert, H.1, Author
Felser, C.3, Author              
Kläui, M.1, Author
Affiliations:
1external, ou_persistent22              
2Stanislav Chadov, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863440              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 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 (93(-11)(+7)) % 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.

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 Dates: 2014-05-30
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: ISI: 000337540400001
DOI: 10.1038/ncomms4974
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 5 Sequence Number: 3974 Start / End Page: 1 - 5 Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723