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Hard x-ray photoelectron spectroscopy of buried Heusler compounds

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Ouardi, S., Balke, B., Gloskovskii, A., Fecher, G. H., Felser, C., Schönhense, G., et al. (2009). Hard x-ray photoelectron spectroscopy of buried Heusler compounds. Journal of Physics D: Applied Physics, 42(8): 084010, pp. 1-7. doi:10.1088/0022-3727/42/8/084010.

This work reports on high energy photoelectron spectroscopy from the valence band of buried Heusler thin films (Co(2)MnSi and Co(2)FeAl(0.5)Si(0.5)) excited by photons of about 6 keV energy. The measurements were performed on thin films covered by MgO and SiO(x) with different thicknesses from 1 to 20 nm of the insulating layer and additional AlO(x) or Ru protective layers. It is shown that the insulating layer does not affect the high energy spectra of the Heusler compound close to the Fermi energy. The high resolution measurements of the valence band close to the Fermi energy indicate a very large electron mean free path of the electrons through the insulating layer. The spectra of the buried thin films agree well with previous measurements from bulk samples. The valence band spectra of the two different Heusler compounds exhibit clear differences in the low lying s bands as well as close to the Fermi energy.