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Optical pump-probe techniques are used to generate and measure electron spinpolarization in a gallium arsenide epilayer in which the electron spincoherence time exceeds the mode-locked laser repetition period. Resonant spinamplification occurs at magnetic fields at which the electron spin polarizationexcited by successive laser pulses add constructively. Measurements of Kerrrotation as a function of applied magnetic field reveal nuclear spinpolarization that aligns either with or against the external magnetic fielddepending on whether the applied magnetic field is being decreased orincreased. Furthermore, the nuclear spin polarization magnitude varies inproportion to the perpendicular net electron spin polarization as the latterchanges due to resonant spin amplification and other causes. We also report anexperimental technique that reveals a minutes-long memory of precise fieldhistory in the electron-nuclear spin system.

Observation of magnetic-field-sweep-direction-dependent dynamic nuclear polarization under periodic optical electron spin pumping