Effect of attached resonators on magnon propagation in dipole-coupled nanostructured waveguide

International audienceWe report a theoretical study on the effect of the exchange coupling on magnon propagation in a waveguide, composed of a dipole-coupled nanometric magnetic cluster chain and a few additional clusters near the chain. We show that an appropriate choice of the exchange coupling constant J or the geometrical/magnetic parameters of the structure can lead either to narrow dips or to narrow peaks in the transmission spectrum of magnons along the chain. The phase of the transmission amplitude, the state phase shift and the variation of the density of states are also discussed as a function of frequency for different values of J. The effect of attenuation on the transmission spectra is also discussed. The results are obtained by means of the Green's function technique. The presented study could be useful for constructing the selecting or rejecting magnon filters