  Full electric-field control of spin orientations is one of the key tasks in
semiconductor spintronics. We demonstrate that electric field pulses can be
utilized for phase-coherent +/- pi spin rotation of optically generated
electron spin packets in InGaAs epilayers detected by time-resolved Faraday
rotation. Through spin-orbit interaction, the electric-field pulses act as
local magnetic field pulses (LMFP). By the temporal control of the LMFP, we can
turn on and off electron spin precession and thereby rotate the spin direction
into arbitrary orientations in a 2-dimensional plane. Furthermore, we
demonstrate a spin echo-type spin drift experiment and find an unexpected
partial spin rephasing, which is evident by a doubling of the spin dephasing
time.
