S.J. Carter, P.D. Drummond, et al.
Physical Review Letters
The spin polarization of current injected into GaAs from a CoFe/MgO(100) tunnel injector is inferred from the electroluminescence polarization from GaAs/AlGaAs quantum well detectors. The polarization reaches 57% at 100 K and 47% at 290 K in a 5 T perpendicular magnetic field. Taking into account the field dependence of the luminescence polarization, the spin injection efficiency is at least 52% at 100 K, and 32% at 290 K. We find a nonmonotonic temperature dependence of the polarization which can be attributed to spin relaxation in the quantum well detectors. © 2005 The American Physical Society.
S.J. Carter, P.D. Drummond, et al.
Physical Review Letters
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CLEO 1997
M. Levenson, R.M. Shelby, et al.
Physical Review A
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IEDM 2006