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Spin-injection spectra of CoFe/GaAs contacts: dependence on Fe concentration, interface and annealing conditions

Spin injection from Co70Fe30 and Fe contacts into bulk GaAs(001) epilayers is studied experimentally. Using nonlocal measurements, the spin polarization of the differential conductance is determined as a function of the bias voltage applied across the injection interface. The spectra reveal an interface-related minority-spin peak at forward bias and a majority-spin peak at reverse bias, and are very similar, but shifted in energy, for Co70Fe30 and for Fe contacts. An increase of the spin-injection efficiency and a shift of the spectrum correlate with the Ga-to-As ratio at the interface between CoFe and GaAs.

preprint2011arXivOpen access
G. SalisS. F. AlvaradoA. Fuhrer
cond-mat.mes-hall
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G. SalisS. F. AlvaradoA. Fuhrer

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