Abstract
We studied the Au thickness and the primary electron energy-dependence of polarization of secondary electrons emitted from Au thin film on an Fe(110) substrate. By fitting to the experimental data using the exponential function, we found that the magnetic information depth λ m of the secondary electron polarization increases with primary electron energy E p from λ m = 6 A ̊ at E p = 70 eV to λ m = 26 A ̊ at E p = 4 keV. The accuracy of the fit degrades with higher E p. We explain this behavior by considering the difference in secondary yields between Au and Fe.
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