Abstract
Detailed numerical calculations and simple analytical expressions of the surface impedance for both the pinned and umpinned boundary conditions in parallel resonance are reported. When the small component of the magnetization vanishes on the surfaces of a thin film (the pinned case), the surface impedance, which is proportional to the average power absorbed by the specimen, can be expressed as a sum of two contributions: a general ferromagnetic resonant background (FMRB) controlled by conduction and dipole-dipole effects with superimposed standing spin wave resonant peaks (SWRP). For thick specimens the FMRB dominates the response and possesses a maximum which is shifted to lower fields than that predicted by the Kittel formula. The phenomenon of ferromagnetic antiresonance (FMAR) is treated in detail and shown to be controlled principally by the phenomenological magnetic damping parameter.
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