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Spin dependent photoelectron tunnelling from GaAs into magnetic Cobalt

The spin dependence of the photoelectron tunnel current from free standing GaAs films into out-of- plane magnetized Cobalt films is demonstrated. The measured spin asymmetry (A) resulting from a change in light helicity, reaches +/- 6% around zero applied tunnel bias and drops to +/- 2% at a bias of -1.6 V applied to the GaAs. This decrease is a result of the drop in the photoelectron spin polarization that results from a reduction in the GaAs surface recombination velocity. The sign of A changes with that of the Cobalt magnetization direction. In contrast, on a (nonmagnetic) Gold film A ~ 0%.

preprint2010arXivOpen access
D. VuH. F. JurcaF. MarounP. AllongueN. TournerieA. C. H. RoweD. PagetS. ArscottE. Peytavit
cond-mat.mes-hallcond-mat.mtrl-sci
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Open access9 authors2 topics
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D. VuH. F. JurcaF. MarounP. AllongueN. TournerieA. C. H. RoweD. PagetS. ArscottE. Peytavit

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