SPIN AND ANGLE-RESOLVED PHOTOEMISSION-STUDIES OF ONE TO 3 MONOLAYER FILMS OF P(1X1) FE ON W(100)

The electronic and magnetic properties of thin (one to three monolayer) epitaxial Fe films grown on W(100) are studied using spin-polarized angle-resolved photoemission. Low-energy electron-diffraction studies of a number of samples confirm excellent epitaxy for monolayer films and suggest that two- and three-layer films begin to form strain-relieving dislocations. Submonolayer films manifest no in-plane remanent spin polarization at T = 115 K, but effectively quench W(100) surface states and surface resonances. Monolayer and thicker films yield spin-polarized photoelectrons under remanent magnetic conditions. Analysis of spin-polarized electron energy distribution curves (EDCs) corresponding to even-symmetry initial states along the GRAMMARBAR-MBAR direction of the two-dimensional Brillouin zone yields a flat majority-spin band at 0.95 eV and an exchange split pair of bands (DELTA-E(ex) = 2.15 +/- 0.2 eV at GAMMABAR, 1.2 +/- 0.2 eV at MBAR) which exhibit significant dispersion. No significant changes in the binding energies of spin-up or -down features in EDCs obtained above the Curie temperature at GAMMABAR (normal emission geometry) were detected.