Spin-wave resonance in $\mathrm{Co}_{1-x}\mathrm P_x/\mathrm{Co}_{1-y}\mathrm P_y$ multilayer structures

Modification of spectrum of spin waves is found out in multilayer structures $(\mathrm{Co_{98}P_2/Co_{95}P_5})_N$ by SWR technique. It is caused by formation of the first, the second and the third Brilluen zones in magnon crystal, which formed by periodic modulation of an exchange. Band gap sizes are measured at the wave vector $k_b=\pi/(d_1+d_2)$ and $2k_b$.