Mapping of unoccupied minority spin bands of Co and Ni using inverse photoemission

Angle-resolved inverse photoemission (or bremsstrahlung spectroscopy) with a tunable light detector is used to determine the energy-band dispersion of unoccupied minority-spin 3d states in Co and Ni. For Co, a ferromagnetic exchange splitting of 0.93 ± 0.1 eV between the unoccupied spin-down and occupied spin-up states (measured with photoemission) is derived. The full width at half maxiumum of empty 3d states in Ni is 0.25 ± 0.1 eV. © 1982 The American Physical Society.