Optimized stray-field-induced enhancement of the electron spin precession by buried Fe gates

L. Meier, G. Salis, N. Moll, C. Ellenberger, I. Shorubalko, U. Wahlen, K. Ensslin, E. Gini

Published 2007-09-13Version 1

The magnetic stray field from Fe gates is used to modify the spin precession frequency of InGaAs/GaAs quantum-well electrons in an external magnetic field. By using an etching process to position the gates directly in the plane of the quantum well, the stray-field influence on the spin precession increases significantly compared with results from previous studies with top-gated structures. In line with numerical simulations, the stray-field-induced precession frequency increases as the gap between the ferromagnetic gates is reduced. The inhomogeneous stray field leads to additional spin dephasing.