Abstract
Using spin-polarized electron emission spectroscopy (SPEES), we have studied electronic excitations at clean and oxygen-covered Fe surfaces. Employing small angle (α=1°) surface interaction of 7–28 keV Ne+ ions, we investigated the spin-polarized, angle-resolved energy distribution (ARED) of electrons emitted from these surfaces. For small α, the ARED is significantly different from electron- or ion-induced secondary electron spectra obtained at larger α. We note that 25 keV Ne+ ions incident at α=1° are specularly reflected and probe the topmost surface layer whereas for αr>2°, the ions penetrate the surface thereby probing bulk layers. At clean Fe surfaces, we find for α-1° and 45° average values of the electron spin polarization (ESP) of (33±2)% and (25±2)%. These values show that the surface magnetization (33%) is enhanced by approximately 30% compared to the bulk value (25%). These findings give clear evidence that SPEES is a powerful technique to study layer-dependent magnetic properties.
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