Surface spin polarization of the non-stoichiometric Heusler compound Co2Mn(alpha)Si

Jan-Peter Wüstenberg; Mirko Cinchetti; Martin Aeschlimann; Jan Minár; Jürgen Braun; Hubert Ebert; Takayuki Ishikawa; Tetsuya Uemura; Masafumi Yamamoto

doi:10.1103/PhysRevB.85.064407

Surface spin polarization of the non-stoichiometric Heusler compound Co2Mn(alpha)Si

Materials Science 2015-05-30 v2

Authors: Jan-Peter Wüstenberg , Mirko Cinchetti , Martin Aeschlimann , Jan Minár , Jürgen Braun , Hubert Ebert , Takayuki Ishikawa , Tetsuya Uemura , Masafumi Yamamoto

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Abstract

Using a combined approach of spin-resolved photoemission spectroscopy, band structure and photoemission calculations we investigate the influence of bulk defects and surface states on the spin polarization of Co2Mn(alpha)Si thin films with bulk L21 order. We find that for Mn-poor alloys the spin polarization at EF is negative due to the presence of Co_Mn antisite and minority surface state contributions. In Mn-rich alloys, the suppression of Co(Mn) antisites leads to a positive spin polarization at the Fermi energy, and the influence of minority surface states on the photoelectron spin polarization is reduced.

Keywords

Heusler compound Co2MnSi spin polarization surface state photoemission spectroscopy half-metallicity antisite defect

Cite

@article{arxiv.1110.5451,
  title  = {Surface spin polarization of the non-stoichiometric Heusler compound Co2Mn(alpha)Si},
  author = {Jan-Peter Wüstenberg and Mirko Cinchetti and Martin Aeschlimann and Jan Minár and Jürgen Braun and Hubert Ebert and Takayuki Ishikawa and Tetsuya Uemura and Masafumi Yamamoto},
  journal= {arXiv preprint arXiv:1110.5451},
  year   = {2015}
}

Surface spin polarization of the non-stoichiometric Heusler compound Co2Mn(alpha)Si

Abstract

Keywords

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