  We have investigated multifunctional periodic structures in which
electromagnetic waves and spin waves can be confined in the same areas. Such
simultaneous localization of both sorts of excitations can potentially enhance
the interaction between electromagnetic waves and spin waves. The system we
considered has a form of one dimensional photonic-magnonic crystal with two
types of magnetic layers (thicker and thinner ones) separated by sections of
the dielectric photonic crystals. We focused on the electromagnetic defect
modes localized in the magnetic layers (areas where spin waves can be exited)
and decaying in the sections of conventional (nonmagnetic) photonic crystals.
We showed how the change of relative thickness of two types of the magnetic
layers can influence on the spectrum of spin waves and electromagnetic defect
modes, both localized in magnetic parts of the system.
