Characterization of the Surface Electronic Properties of Co2Cr1−xFexAl
Due to their half metallic properties and high Curie temperatures Heusler alloys are potential key materials for future application in spin-based devices. One crucial aspect for device performance is the electron spin polarization at surfaces and interfaces, which in general deviates from bulk values due to the different bonding environment. Here, we present spin-resolved photoemission data on surfaces of Co2Cr1−xFexAl thin films. The influence of bulk and surface contributions on the spin-resolved spectra is discussed for x=0, x=0.4 and x=1, yielding information on disorder, surface states and calculation schemes that are consistent with our spin-resolved photoemission experiments.
KeywordsFermi Energy Spin Polarization Heusler Alloy Surface Unit Cell Bulk Band Structure
This work was supported by the Research Center OPTIMAS and the DFG Forschergruppe through DFG FG559 “New materials with high spin polarization” (project P10). We would like to thank C. Herbort and M. Jourdan for preparation of the samples and G.H. Fecher for supporting us with the band structure data. B. Krenzer is acknowledged for discussion about the interpretation of LEED patterns; R. Fetzer and J. Fischer are acknowledged for experimental assistance.
- 5.Felser C, Elmers HJ, Fecher G (2005) The properties of Co2Cr1−xFexAl Heusler compounds, vol 676. Springer, Berlin, p 113 Google Scholar
- 27.Kirschner J (1985) Polarized electrons at surfaces. Springer, Berlin Google Scholar