Electrical spin injection into Si(001) through a SiO2 tunnel barrier

Li, C. H.; Kioseoglou, G.; van ‘t Erve, O. M. J.; Thompson, P. E.; Jonker, B. T.
October 2009
Applied Physics Letters;10/26/2009, Vol. 95 Issue 17, p172102
Academic Journal
We demonstrate spin polarized tunneling from Fe through a SiO2 tunnel barrier into a Si n-i-p heterostructure. Transport measurements indicate that single step tunneling is the dominant transport mechanism. The circular polarization Pcirc of the electroluminescence shows that the tunneling spin polarization reflects Fe majority spin. Pcirc tracks the Fe magnetization, confirming that the spin-polarized electrons radiatively recombining in the Si originate from the Fe. A rate equation analysis provides a lower bound of 30% for the electron spin polarization in the Si at 5 K.


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