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We compare electrical spin injection from Fe into Si n-i-p heterostructures using different tunnel barriers—a reversed biased Fe/Si Schottky contact and a Fe/Al2O3 barrier. The electroluminescence (EL) spectra are dominated by transverse acoustic and optical phonon emission for both types of structures. The circular polarization of the EL tracks the Fe magnetization, confirming that the spin-polarized electrons originate from the Fe in each case. However, the polarization is lower for the Fe/Si contact than for the Fe/Al2O3 contact. Transmission electron microscopy reveals a complex interface and intermixing for Fe/Si that is absent in Fe/Al2O3/Si.
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Κιοσέογλου et al. (2009) studied this question.
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