SPIN-RESOLVED TEMPERATURE-DEPENDENT PHOTOEMISSION FROM ULTRATHIN FENIALLOY-FILMS

The temperature dependence of the electronic structure of FexNi1-x thi n films grown epitaxially on a Cu(001) surface has been studied by spi n-resolved photoelectron spectroscopy for concentrations of x= 0.47, 0 .64 and 0.87. For all temperatures and concentrations studied we found that the minority spin component can be represented by the Fermi func tion. The low temperature spectra show a gap between majority and mino rity spin component which is vanishing when the Curie temperature is r eached. In the Invar alloy film, the gap does not change in magnitude between 100 and 300 K.