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We investigate the spin dynamics including Gilbert damping in theferromagnetic nanowire arrays. We have measured the ferromagnetic resonance offerromagnetic nanowire arrays using vector-network analyzer ferromagneticresonance (VNA-FMR) and analyzed the results with the micromagneticsimulations. We find excellent agreement between the experimental VNA-FMRspectra and micromagnetic simulations result for various applied magneticfields. We find that the demagnetization factor for longitudinal conditions, Nz(Ny) increases (decreases) as decreasing the nanowire width in themicromagnetic simulations. For the transverse magnetic field, Nz (Ny) increases(decreases) as increasing the nanowire width. We also find that the Gilbertdamping constant increases from 0.018 to 0.051 as the increasing nanowire widthfor the transverse case, while it is almost constant as 0.021 for thelongitudinal case.

Study of spin dynamics and damping on the magnetic nanowire arrays with various nanowire widths