Magnonic crystal

Propagation of nonlinear magnetostatic surface waves through the one-dimensional magnonic crystal based on yttrium-iron garnet film with the defect of periodic array was experimentally studied.

There are introduced ferromagnetic periodic structures consist of two coupled magnonic crystals and related magnonic and crystal film, separated by a dielectric layer. The dispersion equation made for magnetostatic waves, that propagate in such structures and identified main features of formation band gaps and a comparison with a periodic structure of one magnonic crystal was made.

The periodic structure consisting of a shallow grooves on a surface of a ferromagnetic film was investigated. The electrodynamical characteristics of propagation of the surface magnetostatic wave in this structure were obtained. The 2D model of the periodical Yttrium Iron Garnet structure was numerically studied by the algorithm based on the Finite Element method. The spatial distribution of the electric and magnetic field components in different points of dispersion characteristics was studied in detail. The comparison of experimental data and numerical results was carried out.