WAVE-VECTOR-DEPENDENT EXCHANGE SPLITTING IN A LOCAL MOMENT SYSTEM

The electronic structure of strained thin films of Gd has been studied with spin- and angle-resolved photoemission and spin-polarized invers e photoemission. The spin-dependent electronic structure is dominated by a very distinct k dependence of the exchange splitting. The surface magnetic structure is observed to be different from that of the bulk, as indicated by the different electronic structure and a much higher surface Curie temperature. The 4% strain within the Gd films results i n an enhanced Curie temperature.