Surface magnetostatic waves and magnetic polaritons at the junction of the magnetic superlattice and magnetic material

Using electromagnetic wave theory in the Voigt configuration, the surface magnetostatic waves (MW) and magnetic polaritons localized at the junction between semi-infinite magnetic superlattice (SL) and magnetic material are analysed theoretically. The general dispersion relation for localized MW and magnetic polaritons are derived by the transfer matrix method in the long-wavelength limit. Some examples of the wave spectra are presented for SL composed of two magnetic materials (Fe/Co). The dispersion curves for different contact materials (contact material with Ni, Co and Gd, respectively) are calculated numerically and the ranges within which surface modes frequencies lie are discussed.