Atomic arrangement and magnetism of iron silicide on Fe(1Â 0Â 0) surface

► We study surface magnetic structure of Fe(1 0 0) deposited with Si. ► The Si atoms are incorporated into the Fe subsurface via the substitutional site of bcc Fe at the Si/Fe interface. ► The reacted Si/Fe surface has an atomic arrangement similar to that of the Fe-Si plane terminated-Fe3Si(1 0 0).