Towards a full Heusler alloy showing room temperature half-metallicity   at the surface
  In this article we investigate the surface spin polarization in a 100 nm Co2Cr0.6Fe0.4Al (CCFA) film grown ex situ epitaxially on MgO(100) with a 10 nm Fe buffer layer by means of spin resolved photoemission. We show that a careful in situ preparation of the sample surface leads to values for the room temperature spin polarization up to 45% at the Fermi level. To our knowledge, this is the highest value measured so far at the surface region of a full Heusler alloy at room temperature. 
M. Cinchetti, J.-P. W\"ustenberg, M. S\'anchez Albaneda, F. Steeb, A.   Conca, M. Jourdan, M. Aeschlimann