Magnetostatic Propagation for Uniform Normally‐Magnetized Multilayer Planar Structures

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Abstract
Magnetostatic propagation in layered structures with magnetization in the plane and perpendicular to the direction of propagation has been studied theoretically and experimentally. Problems in device application of this geometry include low power saturation levels and limited delay times for reasonable film sizes. Both problems are minimized by use of normal magnetization giving volume modes having isotropic propagation in the film plane. This work reports theoretical and experimental studies for a normally‐magnetized ground plane‐dielectric‐YIG‐dielectric‐ground plane structure. The dispersion relation is derived for the magnetostatic limit and this geometry. This theory indicates that with at least one ground plane within a magnetostatic wavelength of the YIG, significant modification of the dispersion characteristic can be obtained. Nondispersive regions of approximately 10% bandwidths are predicted. Experimental studies with an LPE‐YIG film thickness of 10μm and a dielectric thickness of 8 to 20 times the YIG thickness show nondispersive propagation over bandwidths > 100MHz at 1.6GHz. Agreement between theory and experiment is good. Saturation characteristics are better than those of similar magnetostatic surface wave devices.

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