MAGNETIC SPLITTING OF IMAGE STATES AT FE(110)

The exchange splitting of image-induced surface states on Fe(110) is c alculated by spin-polarized near-surface embedding. The splitting is 5 5 meV for the n = 1 state and is primarily a result of coupling to the spin-polarized substrate potential. The effect of the spin-polarized surface barrier is relatively small and of opposite sign to the substr ate contribution. This surprising result is a direct consequence of th e negative spin density of surface electrons at the Fermi energy, illu strating the sensitivity of spin-split image states to surface magneti c properties.