Novel Studies of Spin-polarized Electrons Emitted during Grazing Incidence Ion Reflection at Magnetic Surfaces

Using a new technique, spin-polarized electron emission spectroscopy (SPEES) and electron capture spectroscopy (ECS). the electron spin polarization (ESP) at the topmost surface layer of ferromagnetic materials is investigated. All surfaces are well characterized using AES, LEED. RHEED and STM. Nonzero ESP is found at remanently magnetized surfaces of atomically clean, amorphous Fes,B,, and (llO)-surface-o~ented Ni picture-frame single crystals. The angle-resolved energy dist~bution of the ion-induced emitted electrons is strong& different from that of electron-induced secondar?; electrons and contains most valuable information on the surface magnetic structure of Ni(ll0) and on the spin dependence of various electronic transition processes occurring at surfaces. The ESP of electrons (energies between 9 and 12 eV) emitted during grazing-angle ion reflection amounts to + 5.5% which is close to the total net Ni-magnetization of + 5.6%