Time-resolved Faraday rotation is used to measure the coherent electron spin precession in a GaAs/InGaAs quantum well below an interdigitated magnetized Fe grating. We show that the electron spin precession frequency can be modified by applying a gate voltage of opposite polarity to neighboring bars. A tunability of the precession frequency of 0.5 GHz/V has been observed. Modulating the gate potential with a gigahertz frequency allows the electron spin precession to be controlled on a nanosecond timescale.
@article{arxiv.cond-mat/0612558,
title = {Gate tunability of stray-field-induced electron spin precession in a GaAs/InGaAs quantum well below an interdigitated magnetized Fe grating},
author = {L. Meier and G. Salis and C. Ellenberger and E. Gini and K. Ensslin},
journal= {arXiv preprint arXiv:cond-mat/0612558},
year = {2007}
}