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We investigate the influence of Meissner screening and trapped magnetic fluxon magnetization dynamics for a Ni80Fe20 film sandwiched between two thick Nblayers (100 nm) using broadband (5-20 GHz) ferromagnetic resonance (FMR)spectroscopy. Below the superconducting transition Tc of Nb, significantzero-frequency line broadening (5-6 mT) and DC resonance field shift (50 mT) toa low field are both observed if the Nb thickness is comparable to the Londonpenetration depth of Nb films (>= 100 nm). We attribute the observed peculiarbehaviors to the increased incoherent precession near the Ni80Fe20/Nb interfaceand the effectively focused magnetic flux in the middle Ni80Fe20 caused bystrong Meissner screening and (defect-)trapped flux of the thick adjacent Nblayers. This explanation is supported by static magnetic properties of thesamples and comparison with FMR data on thick Nb/Ni80Fe20 bilayers. Great careshould therefore be taken in the analysis of FMR response in ferromagneticJosephson structures with thick superconductors, a fundamental property forhigh-frequency device applications of spin-polarized supercurrents.

Effect of Meissner screening and trapped magnetic flux on magnetization dynamics in thick Nb/Ni80Fe20/Nb trilayers