Propagating magnetic waves in thick films A complementary technology to surface wave acoustics†

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Abstract
A new form of microwave integrated circuit seems realizable utilizing propagating magnetic waves in epitaxial films of yttrium iron garnet (YIG). The technology is complementary to that of surface acoustic waves with the advantage of operation up to 10 GHz. Both dispersive and non-diapersive properties may be realized with the magnetic waves by using suitably coded, spatially periodic, transducers. The confinement of energy to thin magnetic films permits the fabrication of tapped delay lines. A matrix array of transducers, in conjunction with the anisotropic nature of magnetic wave propagation, has permitted the fabrication of electronically steerable delay lines. The spatial profiles of these magnetic beams have been measured by surface probing techniques. Selective etching of the YIG samples allows magnetic waveguides and directional couplers to be integrated with the other devices for signal processing purposes.

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