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Time-resolved electrical spin transport is used to generate and probe spincurrents in GaAs electrically. We use high bandwidth current pulses to injectphase-coherent spin packets from Fe into n-GaAs. By means of time-resolvedFaraday rotation we demonstrate that spins are injected with a clearly definedphase by the observation of multiple Larmor precession cycles. We furthermoreshow that spin precession of optically created spin packets in n-GaAs can beprobed electrically by spin-polarized photo-current pulses. The injection anddetection experiments are not direct reciprocals of each other. In particular,we find that interfacial spin accumulation generated by the photocurrent pulseplays a critical role in time-resolved electrical spin detection.

Triggering and probing of phase-coherent spin packets by time-resolved spin transport across an Fe/GaAs Schottky barrier