Abstract:
We report angle-resolved inverse-photoemission spectroscopy and ultraviolet-photoemissionspectroscopy measurements of the electronic structure of Cu(100), Ni(100), and pseudomorphic films of
fee Co and Fe on Cu(100). The unoccupied critical points at X are determined. These results are combined with recent photoemission data for use as input to an empirical combined-interpolation-scheme
calculation of the energy-band dispersions for the allowed bands at k|| =0. The ferromagnetic exchange
splittings of the Δ₅-symmetry 3d bands are estimated to be ΔEₑₓ =0. 3 eV, 1.2 eV, and 1.2 eV for Ni(100),
Co(100), and Fe(100), respectively. The exchange splitting of the fee Fe indicates that films deposited at
room temperature are in the predicted low-spin magnetic phase. Annealing the Fe films produces a
paramagnetic phase that exhibits no exchange splitting.
