Nonreciprocal Magnetostatic Surface Waves with Independently Controllable Propagation and Decay Constants

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Abstract
The characteristics of inhomogeneous TE eigenwaves propagating in a transversely magnetized uniform gyromagnetic medium are presented‐with special emphasis given to the magnetostatic region of the dispersion relation. It is shown that when the magnetization is not parallel to the electric field, the tensor nature of the medium constrains and thereby controls the relationship between the propagation and decay constants. In addition, the eigenwaves are nonreciprocal in the field displacement sense allowing novel magnetic control to be exercised over them. As a consequence it should be possible to vary the depth of penetration of such a wave and in fact cause propagation to switch from one to the other surface of a gyromagnetic slab provided the faces are terminated in suitable surface impedances that allow the desired eigenwave to propagate as a bound surface wave mode. Such modes may form the basis for novel filters and nonreciprocal components constructed with convenient planar geometries.

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