Local Valence Structure of Fe in Fe3Si/GaAs(001)

A high quality, eptiaxial magnetic films of Fe$_{3}$Si on GaAs(001) substrates were studied in our experiment. Fe$_{3}$Si is ferromagnet and can be regarded as a Heusler-like alloy with a composition of Fe$_{2}$FeSi. There is possibility that Fe$_{3}$Si is a half metal which is an ideal candidate for spin injection, although the calculated density of states for bulk Fe$_{3}$Si does not predict half-metallic behavior. By using diffraction anomalous fine structure measurement, there is chance to look at the anomalous effect on the different atom sites. Two diffraction of Fe$_{3}$Si were measured as (002) and (004) to understand the local electron density structure in different Fe sites and the spectra show significant different features. By carefully handling these DAFS results, there is chance to understand the structure of the local density of state of the Fe atoms in different crystal sites.