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 nonstoichiometric thin films (with and ) with bulk order. We find that for Mn-poor alloys the spin polarization at the Fermi energy is negative due to the presence of Co antisite and minority surface state contributions. In Mn-rich alloys, the suppression of Co antisites leads to a positive spin polarization at , and the influence of minority surface states on the photoelectron spin polarization is reduced.
4 More- Received 28 October 2011
DOI:https://doi.org/10.1103/PhysRevB.85.064407
©2012 American Physical Society