Spin-wave resonance in chemically deposited Fe–Ni films: measuring the spin-wave stiffness and surface anisotropy constant

Single-layer Fe$_{x}$Ni$_{1-x}$ thin magnetic films have been investigated by the spin-wave resonance technique in the entire concentration range. The surface anisotropy and exchange stiffness constants for the films with a Ni content from 30 to 80 at % have been measured from the experimental standing spin wave spectra. The surface exchange spin wave penetration depth $\delta_ C$ = 20–30 nm has been determined from the dependences of the surface anisotropy and exchange coupling constants on the Fe$_{20}$Ni$_{80}$ film thickness in the range of 250–400 nm.