Chemical and electronic properties of ion beam synthesized Fe-Si binary structures are studied using X-ray photoelectron spectroscopy binding energy analysis. Ferromagnetic Fe-Si (Fe3Si) binary structure formation is enhanced in the ion-beam synthesis process by applying an in situ external magnetic field parallel to the Si substrate during the Fe implantation. Core-level analysis shows features corresponding to chemical environments of different Fe-Si phases. Fe 2p3/2 and Fe 3s peaks were analyzed, considering pe…