The resonance frequency and the damping constant are interesting parametersrelated to the ferromagnetic spin resonance phenomenon. In this study theseparameters have been investigated for a number of Heusler multilayer film samplesusing a vector network analyzer ferromagnetic resonance setup. The complexsusceptibility of the samples is extracted from the transmittance scattering parameterS12 measured by the network vector analyzer. The ferromagnetic resonance ismirrored by a maximum in the imaginary part of the complex susceptibility. Theagreement between the theoretically calculated resonance frequency and theresonance frequency measured varied between samples. These differences originatefrom several sources, one of them is, the uncertainty in the internal magnetic field.This is due to irregularities and repeated interfaces between each layer in the Heuslersamples.