Enhanced CPP-GMR effect by improved B2-order of Co2(Mn0.6Fe0.4)Ge Heusler layer deposited on amorphous CoFeBTa underlayer: A quantitative estimation of site-disordering by anomalous x-ray diffraction

Due to the theoretically predicted half-metallicity together with high Curie temperature well beyond room temperature, Co
2
YZ type (Y = Mn, Fe, and Z = Si, Ge, Al, Ga etc.) full Heusler alloys have received extensive research interests for spintronic device applications such as read head sensors of hard disk drive using current-perpendicular-to-plane giant magnetoresistance (CPP-GMR).