Direct observation of half-metallicity in the Heusler compound Co2MnSi

Jourdan, M.; Minár, J.; Braun, J.; Kronenberg, A.; Chadov, S.; Balke, B.; Gloskovskii, A.; Kolbe, M.; Elmers, H. J.; Schönhense, G.; Ebert, H.; Felser, C.; Kläui, M.

doi:10.1038/ncomms4974

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Direct observation of half-metallicity in the Heusler compound Co₂MnSi

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Chadov, S.
Stanislav Chadov, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser, C.
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-FC0F-5

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.