Accession Number : AD0780640

Title :   Magnetostatic Surface Waves in Ferrimagnets above 4 GHz.

Descriptive Note : Physical sciences research papers,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Sethares,James C. ; Merry,J. Bradford

Report Date : 28 FEB 1974

Pagination or Media Count : 27

Abstract : Microwave properties of magnetostatic surface waves in saturated ferrimagnets are described. Particular emphasis is given to experimental aspects of the subject. A summary background is given of pertinent experimental investigations of magnetostatic surface waves (MSSW) from 1968, when they were first observed, to the present. Certain features such as nonreciprocity, electronic tunability, and high coupling efficiencies are discussed. Propagation losses, between 4 and 15 GHz, on chemically-polished yttrium iron garnet (YIG) slabs were measured. Effects of inhomogeneous internal fields, the effects of placing metal conducting planes parallel to the surface upon which the waves propagate to modify the dispersion relation, and the effects of surrounding a single crystal slab (supporting resonant modes) with metal coated polycrystalline YIG to increase field homogeneity, are considered. Magnetostatic surface wave losses, above a few GHz, are less than those of acoustic surface waves. It is concluded that MSSW technology complements ASW technology at high frequencies. (Modified author abstract)

Descriptors :   *Magnetic materials, *Surface waves, Yttrium compounds, Iron compounds, Garnet, Microwave transmission, Transmission loss, Magnetostatics

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE