Dynamic pinning at a Py/Co interface measured using inductive magnetometry K. J. Kennewell, M. Kostylev, R. Magaraggia, and R. L. Stamps M. Ali Department of Physics & Astronomy, University of Leeds, Leeds, LS2 9JT UNITED KINGDOM A. A. Stashkevich LPMTM CNRS (UPR 9001), Universit ´ e Paris 13, 93430 Villetaneuse, FRANCE D. Greig and B. J. Hickey Department of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT UNITED KINGDOM School of Physics, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, AUSTRALIA Broadband FMR responses for metallic single-layer and bi-layer magnetic films with total thick- nesses smaller than the microwave magnetic skin depth have been studied. Two different types of microwave transducers were used to excite and detect magnetization precession: a narrow coplanar waveguide and a wide microstrip line. Both transducers show efficient excitation of higher-order standing spin wave modes. The ratio of amplitudes of the first standing spin wave to the funda- mental resonant mode is independent of frequency for single films. In contrast, we find a strong variation of the amplitudes with frequency for bi-layers and the ratio is strongly dependent on the ordering of layers with respect to a stripline transducer. Most importantly, cavity FMR measure- ments on the same samples show considerably weaker amplitudes for the standing spin waves. All experimental data are consistent with expected effects due to screening by eddy currents in films with thicknesses below the microwave magnetic skin depth. Finally, conditions for observing eddy current effects in different types of experiments are critically examined. Abstract 1 arXiv:1001.1837v1 [cond-mat.mtrl-sci] 12 Jan 2010