The static and dynamic properties of magnetic Pd/Fe(001) ultra-thin film crystalline structures prepared on GaAs(001) templates were investigated by ferromagnetic resonance from 10 to 73GHz. It will be shown that the formation of a self-assembled nanoscale network of misfit dislocations in crystalline structures could be detected during the growth by fan-out diffraction features in reflection high electron energy diffraction. This network of defects leads to a strong extrinsic magnetic damping. The out-of-plane measurements of the ferromagnetic resonance line-width have revealed that the extrinsic damping was caused by 2-magnon scattering. The contribution to the ferromagnetic resonance line-width from 2-magnon scattering was strongly anisotropic and follows the rectangular symmetry of the glide planes of the misfit dislocation network. It will be shown that the observed strong anisotropy in 2-magnon scattering could be interpreted by Fourier components of magnetic defects. The angular dependence of the Fourier components results in an effective channelling of scattered spin waves.

Two-Magnon Scattering in a Self-Assembled Nanoscale Network of Misfit Dislocations. G.Woltersdorf, B.Heinrich: Physical Review B, 2004, 69[18], 184417 (10pp)