The dispersion characteristic of the magnetostatic surface wave propagating through periodic magnetic-structures has been analyzed by using a Rayleigh assumption which is well known as one of the approximation techniques, where-in a YIG film wave guide with periodic circuits of three different types are considered: One is a wave guide which consists of a YIG film with corrugation grooved against one of the faces, whilst the others are a corrugated YIG film with a metal plate placed against one of the faces and a YIG film backed by a corrugated metal plate.
The Brillouin diagrams, close to the intersection point (ω, β) of m=0 and m=-1 space harmonics, have been evaluated numerically for the case of small modulation indexes of cor-rugation. The stop band frequency was found to be several tens of mega-hertz for a modulation index of the order of a few hundredths Moreover, the phase matching condition of Bragg type was not valid for the case of nonreciprocal propagation of the magnetostatic surface wave, but, is given by the relation: β_??_1.5π/d.
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