Abstract
We study spin-injection dynamics in a magnetic double quantum well by pump-probe absorption spectroscopy. Time dependences of the absorption saturation intensity show a tunneling of spin-polarized carriers from a diluted magnetic well (MW) of Cd0.92Mn0.08Te into a nonmagnetic well (NMW) of CdTe, where the individual tunneling of the electron and heavy hole is elucidated with time constants of 150ps and 1ns. The circular polarization degree of the absorption saturation in NMW increases from 0to70ps, which is caused by the injection of electron spin polarized in MW with a time constant of 54ps.
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