Theory of dual-tunable thin-film multiferroic heterostructures with a coplanar transmission line

A theory of spin-electromagnetic wave (SEW) spectrum has been developed for a thin-film ferrite-ferroelectric structure based on a coplanar transmission line. The dispersion relation was derived through analytical solution of the full set of Maxwell`s equations utilizing a method of approximate boundary conditions. The distinctive features of the investigated structures are the thin-film planar topology and dual tunability of the SEW spectrum.