SPIN-RESOLVED ELECTRON-SPECTROSCOPY WITH HIGHLY POLARIZED SOURCES - INVERSE-PHOTOEMISSION FROM FERROMAGNETS

We report on the use of recently developed spin-polarized electron sou rces with very high polarization for electron spectroscopy. In particu lar we present data of spin-resolved inverse photoemission from Fe(100 ) films excited by polarized electrons produced by a strained GaAsP ne gative electron affinity photocathode. This highly polarized source (b eam polarization P = 65%) allows a direct and almost complete decoupli ng of the majority and minority empty states in Fe(100), much better t han the standard GaAs sources (P = 20%-30%). The preparation and chara cterization of the strained photocathode is also discussed. (C) 1997 A merican Institute of Physics.