Electrical spin injection from Fe into ZnSe(001)

Hanbicki, A. T.; Kioseoglou, G.; Holub, M. A.; van 't Erve, O. M. J.; Jonker, B. T.
February 2009
Applied Physics Letters;2/23/2009, Vol. 94 Issue 8, p082507
Academic Journal
We have electrically injected spin-polarized current from ferromagnetic Fe(001) contacts into n-type ZnSe(001) using reverse-biased Schottky tunnel barriers which form at the Fe/ZnSe interface. Electrons transport through 3000 Ã… of n-ZnSe and radiatively recombine in GaAs, where the circular polarization of the electroluminescence provides a quantitative measure of spin polarization. We measure electron spin polarizations over 50% in the GaAs up to 100 K. Spin injection efficiencies achieved in Fe/ZnSe are comparable to those reported for Fe/AlGaAs or Fe/GaAs Schottky tunnel structures, consistent with the common band symmetries of the Fe majority band and the conduction band of the respective semiconductor.


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