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Spin and Energy Analyzed Secondary Electron Emission from a Ferromagnet



John Unguris, Daniel T. Pierce, A Galejs, Robert Celotta


Measurements are presented of the energy dependence of the spin polarization of low-energy (0.5-25 eV) secondary electrons when a 500-eV primary beam is incident on an iron-based ferromagnetic glass. The polarization of the lowest-energy electrons is found to correspond to the net valence-band spin density. Possible causes for the observed decrease in polarization with increasing secondary energy are discussed. The results demostrate a mechanism for measuring surface magnetic structure with very high spatial resolution of scanning electron microscopy.
Physical Review Letters
Created July 5, 1982, Updated February 19, 2017