The spin dependence of sp-derived bulk and surface states of fee-like
Fe films on Cu(001) has been studied by spin-resolved inverse photoemi
ssion. The exchange splitting of a crystal-induced surface state at (X
) over bar is determined as 0.9 eV. A transition between sp bulklike s
tates about halfway between Gamma and (X) over bar shows a spin splitt
ing of 0.4 eV. The first result is unique proof of a magnetically live
surface layer. The latter shows that ferromagnetic order is not restr
icted to the topmost layer, but the size of the splitting indicates th
at the magnetic moment of the sublayers is reduced compared with the s
urface.