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We calculate current, spin current and tunnel magnetoresistance (TMR) for a quantum dot coupled to ferromagnetic leads in the presence of a square wave of bias voltage. Our results are obtained via time‐dependent nonequilibrium Green function for a non‐interacting electron model. Both parallel and antiparallel lead magnetization alignments are considered. The main findings include a wave of spin accumulation and spin current that can change sign as the time evolves, spikes in the TMR signal and a TMR sign change due to an ultrafast switch from forward to reverse current in the emitter lead. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Spin polarized transport driven by square voltage pulses in a quantum dot system