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

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

2011-10-25

arxiv.org/abs/1110.5451v2

Physics

Condensed Matter

Materials Science

Scientific paper

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.

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