STUDY ON THE SHORT-RANGE ORDER STRUCTURES OF FE-GE AMORPHOUS THIN-FILMS BY EXAFS

The short-range order structures of FexGe1-x amorphous thin films (x = 0.087, 0.191, and 0.285%) were studied by X-ray K edge absorption spectrum. The nearest neighbors around a Ge or an Fe atom constitute two coordinate sub-shells with a very short distance. In the two films with lower Fe content, the short-range order structural parameters around a Ge atom are similar to those of amorphous germanium and the Fe atoms in these films substitute for some Ge ones randomly. The local structure of a-Fe28.5Ge71.5 film deviates from a continuous random network and displays a tendency to dense random packing of atoms. A strong interaction between near neighboring Fe-Ge atoms of a-FexGe1-x films was discovered.Materials Science, MultidisciplinaryPhysics, AppliedPhysics, Condensed MatterSCI(E)EI0ARTICLE2541-54911