Dynamics studies in magnetic bilayer Fe/Au/Fe(001) structures using network analyzer measurements

Fe/Au/Fe(001) ultrathin film structures were grown by molecular beam epitaxy on 4x6 reconstructed GaAs(001) substrates. A microwave network analyzer was used to carry out ferromagnetic resonance (FMR) measurements down to microwave frequency of 1 GHz. The FMR results indicate that the crystalline ultrathin Fe films are of high crystalline quality. The FMR linewidth is mostly given by the intrinsic Gilbert damping and is only weakly affected by small local variations of the internal anisotropy fields. The study at low microwave frequency allowed one to investigate the spin-pumping mechanism in the configuration of noncollinear magnetic moments. (C) 2006 American Institute of Physics.