Surface spin polarization of the nonstoichiometric Heusler alloy Co2MnSi

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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 nonstoichiometric Co2MnαSi thin films (with α = 0.69 and α = 1.19) with bulk L2_[1] order. We find that for Mn-poor alloys the spin polarization at the Fermi energy (E_[F]) 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 E_[F], and the influence of minority surface states on the photoelectron spin polarization is reduced.
2012-02-01