Journal Article

PUBDB-2016-02162

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Direct observation of half-metallicity in the Heusler compound $Co_{2}MnSi$

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

2014
Nature Publishing Group London

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Please use a persistent id in citations: doi:10.1038/ncomms4974

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^{+7}_{-11}) % 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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Contributing Institute(s):

1. PETRA III Extension (FS-PEX)

Research Program(s):

1. 6214 - Nanoscience and Materials for Information Technology (POF3-621) (POF3-621)

Experiment(s):

1. PETRA Beamline P09 (PETRA III)

Appears in the scientific report 2014

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