Coherent Spin Dynamics In Permalloy-Gaas Hybrids At Room Temperature

Time-resolved Kerr rotation is used to study the coherent evolution of spin states in Permalloy-GaAs hybrid structures up to room temperature. Varying the width, distance and orientation of the nanopatterned Permalloy wires allow us to control the degree of frequency shift of the coherent electron spin precession due to the local magnetic fringe field in a wide range. Analytical fringe field calculations describe the measured data at room temperature quite well. (C) 2008 American Institute of Physics.