Magnetostatic bulk wave propagation in a multilayered structure

Bajpai, S. N.; Srivastava, Neelam

doi:10.1049/el:19800197

Cited by 14 publications

(6 citation statements)

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“…Next, we consider a YIG film of finite width [4] as shown in Fig. 3, where the planes x -0 and x = a arc assumed to be PMC's, the planes z",.…”

Section: Complited Resultsmentioning

confidence: 99%

“…3, where the planes x -0 and x = a arc assumed to be PMC's, the planes z",. 0 and z = bare assumed to be PEC's [2], [4], the bias fi eld is along the z axis, and there exist MSFVW modes. Table II exhibits The finite-element solutions agree well with the exact solutions [4].…”

Section: Complited Resultsmentioning

confidence: 99%

“…O' Keeffe el al. [2] and Bajpai et al [4] have investigated the effects of finite sample widths on MSW propagation. Recently, inlerest in threedimensional inhomogeneous MSW waveguides is increasing because high-precision dispersion control is making MSW device application possible [1], [3], [5]-[ 11].…”

Section: Introduction Mmentioning

confidence: 99%

“…In this finite-element ap- proach, the cross section of the waveguide is divided into triangular elements [15], [16J and it is easy to consider the inhomogeneities in the bias field and/ or the magnetiza_ tion. The validity of the method is confirmed by calculating the MSW modes in a YIG-Ioaded rectangular waveguide [10) and in a YIG film of fin ite width [4). Numerical resuhs on the delay characteristics and potential profiles of a YIG film with nonuniform bias fi eld distributions are examined.…”

Section: Introduction Mmentioning

confidence: 99%

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Finite-element analysis of magnetostatic wave propagation in a YIG film of finite dimensions

Koshiba

Long

1989

IEEE Trans. Microwave Theory Techn.

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Abstrucl -A unified numerical approach based on the finite-element met hod is described for the magnetostaric wafe propagation in a VIC f ilm of finite dimensions. Both mDgnefOSIDtic volume 1nl,·e Dnd magnelostatic:surface ",-a,·e modes are tTt'Dteci. The validity of tlit' method is confinnecl b)' calculating the magnetosiDlic "'1I,·e modes in a VIG-lo:Ided rectangular waveguide and in a VIC film of fin Ite width. "The numerical Il'SUlts of a VIC film with nonuniform bias Ileld along the film ",idth are also presented, and the effects of bias field distributions on the delay characteristics a nd pote nti al profiles are exam ined. [6), [8], [9J have discussed the control of MSW propagation by means of a spatially nonuniform bias field. It is also found that control of important feat ures of MSW modes is afforded through the use of bias field gradients and that magnetostatic forward volume waves can be forced to have strong field -displacement characteristics that are either nearly reciprocal or very strongly nonreciprocal. Such control may provide the basis for new forms of microwave signal processors [6] - [9]. In order to analyze these inhomogeneous MSW waveguides, the variational method [12), [13] and the finit e-element method [14] have been introduced. These methods are valid for the solution of inhomogeneous waveguide structures. In the former approach, however, great care is necessary in choosing the trial functions. The laller approach, on the other hand, is applied only to planar structures of infinite wid th .In this paper, a unified approach based on the fin ite-element melhod is described for the MSW propagation in a YIG film of fini te dimensions. Both magnetostatic forward volume wave (MSFVW) and magnetostatic surface wave (MSSW) modes are treated. In this finite-element ap-

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“…Next, we consider a YIG film of finite width [4] as shown in Fig. 3, where the planes x -0 and x = a arc assumed to be PMC's, the planes z",.…”

Section: Complited Resultsmentioning

confidence: 99%

Section: Complited Resultsmentioning

confidence: 99%

Section: Introduction Mmentioning

confidence: 99%

Section: Introduction Mmentioning

confidence: 99%

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Finite-element analysis of magnetostatic wave propagation in a YIG film of finite dimensions

Koshiba

Long

1989

IEEE Trans. Microwave Theory Techn.

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“…Effects of crystalline anisotropy (51,(60)(61)(62)(63)(64) 3. Effects of finite slab width (38,44,65,66) In the following sections we derive the general susceptibility tensor including anisotropy and exchange and present the basic ecuations of magnetostatics. We then derive the basic dispersion relations for the three principle normal modes of an isolated, isotropic, infinite width slab.…”

Section: Summary Of Chaptermentioning

confidence: 99%

Magnetic Field Synthesis for Microwave Magnetics.

Morgenthaler¹

1982

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APPROVED FOR PU/LIC RELEASE" DISTRIIUTIM UNLMTEDThis report has been reviewed by the RADC Public Affairs Office (PA) and is releasable to the National Technical Information Service (NTIS). At NTIS it will be releasable to the general public, including foreign nations.RADC-TR-82-95 has been reviewed and is approved for publication.APPROVED: J 's.A4. JAMES C. SETHARES JOHN P. HUSS Acting Chief, Plans OfficeIf your address has changed or if you wish to be removed from the RADC sailing list, or if the addressee is no longer employed by your organization, please notify RADC (EEAC) -Hanscom API NA 01731. ..This will assist us in maintaining a current sailing list.Do not return copies of this report unless contractual obligations or notices on a specific document requires that it be returned. he Microwave and Quantum Magnetics Group of the M.I.T. Department of Electrical Engineering and Computer Science undertook a two-year research program directed at developing synthesis procedures that allow magnetostatic and/or magnetoelastic modes to be specially tailored for microwave signal processing applications that include magnetically tunable filters and limiters as well as delay lines that are either linearly dispersive or nondispersive over prescribed bandwidths. IntroductionMagnetic resonance is normally very much broadened if a ferrimagnetic sample is immersed in a spatially non-uniform field. Experimentalists measuring fundamental resonance parameters take great pains therefore to employ ellipsoidal sample shapes (usually small spheres) that are positioned in fields of very high uniformity. Because surface roughness is known to cause scattering from the uniform mode to degenerate spinwaves of short wavelengths, thereby increasing the resonance linewidth, additional effort is expended in polishing the surfaces to optical tolerances.Commercial manufacturers of tunable microwave, yttrium iron garnets (YIG) filters avail themselves of this knowledge and employ uniformly magnetized, highly polished spherical single crystals in their designs.From this perspective it is therefore remarkable that we at MIT observed extremely sharp resonances of a very localized character in single crystal YIG slabs and films that encounter highly uniform bias fields. On the other hand, it has been known for some time that magnetoelastic waves can be highly focussed by, and propagate with low loss in, steep magnetic field gradients. One view of the high Q resonance is that magnetostatic mode patterns are formed for which the resonant energies are highly confined to certain regions or "tracks" within the crystal that allow wave propagation around them. If the mode amplitudes are very small at the edges and corners of the sample, the surface scattering (which one would expect to be enormous) is largely prevented; consequently the Q of the resonance is governed primarily by the intrinsic linewidth of the bulk crystal together with normal circuit loading considerations. In effect, appropriately designed magnetic field profiles create surface...

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Magnetostatic Waves in Layered Planar Structures

Sodha¹,

Srivastava²

1981

Microwave Propagation in Ferrimagnetics

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Magnetostatic bulk wave propagation in a multilayered structure

Cited by 14 publications

References 4 publications

Finite-element analysis of magnetostatic wave propagation in a YIG film of finite dimensions

Finite-element analysis of magnetostatic wave propagation in a YIG film of finite dimensions

Magnetic Field Synthesis for Microwave Magnetics.

Magnetostatic Waves in Layered Planar Structures

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