Observation of a high spin polarization of secondary electrons from single crystal Fe and Co |
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Authors: | E. Kisker W. Gudat K. Schröder |
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Affiliation: | Laboratoire pour l''Utilisation du Rayonnement Electromagnetique Orsay, France |
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Abstract: | The spin polarization of secondary electrons with nearly zero kinetic energy from Fe (100) and Co (100), excited with photons of energy between 20 and 60 eV, was found to be 45%±5% for Fe and 35%±5% for Co. This value is higher than the average valence band spin polarization Pb=nb/n=2.2/8=27% and 1.7/9=19% for Fe and Co, respectively. With increasing kinetic energy, the spin polarization of the secondaries decreases to the value of Pb within the first 5 eV, remaining constant (within statistical error) at higher kinetic energies. As a spin dependent scattering process we propose excitations within the d-bands, which can be shown to be asymmetric with respect to the electron spin. The high net spin polarization of the slowest emitted electrons is obtained by filtering out monitory-spin electrons at the vacuum barrier. |
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