Characteristics Of Magnetostatic Surface Waves Research Articles

دراسة خاصية انتشار الموجات الاستاتيكية المغناطيسية غير الخطية عبر طبقتين والأخرى من مادة الفريت

The characteristics of magnetostatic surface waves at microwave frequencies in a layered structure of left-handed material film and a semi-infinite linear ferrite substrate have been investigated. The general dispersion relation is derived and analyzed numerically. It is found that it has two solutions for ω(k), one represents a physical solution and other unacceptable. The effects of the applied external magnetic field around the proposed region have also been examined. Keywords: left-handed materials; dispersion relation; magnetostatic surface waves; wave-guides; boundary conditions. لقد تمت دراسة خاصية انتشار الموجات الإستاتيكية المغناطيسية غير الخطية عبر طبقتين إحداهما من مادة الفريت (YIG) و الأخرى من مادة (LHM) عند ترددات الموجات القصيرة (microwaves frequency) حيث تم اشتقاق معادلة التشتت لتحديد ثابت الانتشار المركب بطريقة التحليل العددي. لقد تبين من خلال التحليل أن للمعادلة حلين ω(k) إحداها يمثل حلا فيزيائيا والآخر غير مقبول. كذلك تمت دراسة تأثير تطبيق المجال المغناطيسي الخارجي عند منطقة التردد المسموح فيها وحولها لتبيان سلوك المادة وتصرفها.

Propagation of Magnetostatic Surface Waves in a Tunable One-Dimensional Magnonic Crystal

We have studied propagation of magnetostatic surface waves in yttrium iron garnet films with attached 1D periodic arrays of metal strips. For different experimental geometries and different designs of 1D periodic arrays of metal strips, propagation spectra of magnetostatic surface waves were measured and analyzed. We have shown a way to control propagation characteristics of magnetostatic surface waves by changing of electrical contact between periodic metal strips.

Analysis on existence of magnetostatic solitons in ferromagnetic film under the influence of carriers

This article studies the characteristics of magnetostatic surface waves (MSSW) in a ferromagnetic film attached to a semiconductor cladding with carriers and shows the existence of magnetostatic solitons in the film. The results indicate that under the influence of drifting carriers, and within some frequency ranges, MSSW can develop into magnetostatic solitons, with the group velocity and phase velocity opposite under some conditions, and the velocity magnitude is related to the carrier density.

Microwave and magnetooptic measurements of nonlinear dispersive magnetostatic waves in a yttrium-iron-garnet-gadolinium-gallium-garnet waveguide

Nonlinear propagation characteristics of magnetostatic surface waves (MSSWs) with carrier frequencies ranging from 0.5 to 7.0 GHz and magnetostatic forward volume waves (MSFVWs) with carrier frequencies ranging from 0.5 to 5.0 GHz in yttrium iron garnet-gadolinium gallium garnet waveguides have been measured in a delay line configuration using both microwave and guided-wave magnetooptic (MO) methods. The latter, involving noncollinear guided-wave MO Bragg interaction, was employed for the first time. For the MSSW, nonlinear characteristics including power limiting, discrete sideband modulation, continuum sideband modulation, and group splitting were observed and measured. Among such nonlinear characteristics, continuum modulation spectrum was observed and measured for the first time. For the MSFVW, nonlinear characteristics including parametric instability and soliton formation were also observed and measured. The MO data obtained by scanning the location of the incident light beam right beneath the input transducer and along the MSW propagation path has shown that the nonlinear characteristics observed were related to propagation and not to electromagnetic to MSW conversion effects at the input. Theoretical estimates are in a fair agreement with the experimental data. Finally, compression of an input pulse of 60 rf cycles (20 ns in width) to an output pulse of 6 rf cycles (2 ns in width) using a 3 GHz MSFVW pulse was also demonstrated.

Characteristics of magneto-static surface wave propagating in layered ferrimagnetic structure with a slightly absorptive superstrate

The paper describes the theoretical and experimental study on the magneto-static surface wave (MSSW) propagating in a layered ferrimagnetic structure, onto which a slightly lossy material such as an electrolyte is covered. We focus on the propagation characteristics of the MSSW; especially, the attenuation of the MSSW, due to the cover material's conductivity. Using the complete electromagnetic theory, the dispersion characteristics of the MSSW were derived. The theoretical analysis was compared with a preliminary experiment using sodium chloride dissolved in water as a superstrate, the result of which was in good agreement. This indicates the possible application of the considered structure to an electrolyte densitometer using the fact that the conductivity is in proportion to the content of the electrolyte.

New nonlinear magnetostatic surface waves in a ferromagnetic (YIG)

The general propagation characteristics of magnetostatic surface waves guided by a single interface of a semi-infinite nonlinear dielectric cover and a ferromagnetic substrate (YIG) have been derived. The nonlinear dielectric cover has intensity dependent refractive indices. The magnetostatic approximation is considered and retardation is ignored in describing the electromagnetic fields in the structure. The used magnetostatic approximation is leading to new waves and might be called nonlinear magnetostatic surface waves. The propagation of these waves is non-reciprocal in contrast to the linear magnetostaic surface waves, which had been only found in the negative direction of propagation.

Characteristics of magnetostatic surface waves propagating in thin metal film coated ferrimagnetic layered structure

A theoretical and experimental study on magnetostatic surface waves (MSSWs) propagating in a thin metal film covered ferrimagnetic layer structure is discussed. The effect of the finite conductivity of the metal coated on the ferrimagnetic layer is emphasized. The dispersion characteristics of the magnetostatic waves, whose propagation constants are complex, are discussed. Agreement between calculated and experimental values for the propagation loss and the transmission bandwidth of the surface waves is generally good.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Characteristics of a high Q filter composed of a magnetic thin-film layered structure with periodic corrugation

The X-band microwave filter characteristics of magnetostatic surface waves (MSSW) in a magnetic layered structure with sinusoidal corrugation on top layer are described. Bragg reflection type filters having a high Q value are numerically evaluated by solving the dispersion relation derived from a singular perturbation method using multiple space scales (MSS). We can conclude that the high Q filter, Q=10000 on our model can be easily obtained by adjusting the saturation magnetization of a noncorrugated layer and the length of corrugation period. The results of our model can smoothly apply for another model, one, two or metal backed layered structures.

A study of dispersion characteristics of magnetostatic surface wave (MSSW) delay lines in the multiple layer films

A correct dispersion equation for MSSW propagating in multiple layer films has been derived. The delay-frequency curves with the various parameters of the film and the applied field have been given. This paper first reports some experimental results of the LPE grown multiple layer films (GGG-La; YIG-GGG-La : YIG) and the MSSW delay lines consisting of the multiple LPE films with one side metallized. The device characteristics of a linear delay over 400 MHz bandwidth in the 3.6 to 4.4 GHz frequency range have been exhibited to be in agreement with theory.

Guiding magnetostatic surface waves with nonuniform in-plane fields

We report the propagation characteristics of magnetostatic surface waves in a rectangular yttrium iron garnet film placed between strips of mumetal and in the plane of the strips. The microstrip excitation structure was designed so as to permit the strips to extend along the entire path of propagation, thereby minimizing field nonuniformities in the longitudinal direction. These experiments suggest that nonuniform in-plane fields can be used to alter the dispersion characteristics of the waves. A theoretical argument is also presented describing a possible energy localization mechanism in nonuniform in-plane fields. In addition, experiments are described in which nonuniform fields caused by a slot in a mumetal covering layer are used to guide magnetostatic surface waves through a turn of 160°.

Directional coupling of magnetostatic surface waves in layered magnetic thin films

The propagation characteristics of magnetostatic surface waves (m.s.s.w.) in a layered system of y.i.g. film, dielectric, y.i.g. film, are theoretically investigated. It is shown that the directional coupling of m.s.s.w. is possible between y.i.g. films. The directional coupling has frequency filtering characteristics due to dispersion of m.s.s.w.

Numerical analysis of MSSW delay line using layered magnetic thin slabs

The time delay characteristics of magnetostatic surface waves propagating in a layered system consisting of thin YIG films, dielectric slabs, and a metal plate are theoretically investigated by a numerical analysis of the dispersion relation. Numerical results for the ferrite-air (FA) and ferrite-air-metal (FAM) modes are compared with the previously reported results.

Amplification of magnetostatic surface waves in a layered structure consisting of metals, dielectrics, a semiconductor, and YIG

The amplifying characteristics of magnetostatic surface waves (MSSW) propagating in a layered structure consisting of metal plates, dielectrics, a semiconductor, and a YIG slab are given. The dispersion relation of the system is derived under the condition of magnetostatic approximation. From the results of computer solution for the dispersion equation, we conclude that a growing MSSW occurs only when the carrier drift velocity is greater than phase velocity of the MSSW. The effect of YIG loss on the wave instability is considered. Also, the influence of a gap between the semiconductor and the YIG slab on the amplifier is discussed.

Characteristics of magnetostatic surface-wave propagation in a layered structure consisting of metals, dielectrics, a semiconductor and y.i.g.

The characteristics of magnetostatic surface waves (m.s.s.w.) propagating in a layered structure consisting of metal plates, dielectrics, a semiconductor and a y.i.g. slab are given. The dispersion relation of the system is derived under the condition of magnetostatic approximation. From the results of computer solution for the dispersion equation, we conclude that a growing m.s.s.w. occurs only when the carrier drift velocity is greater than phase velocity of the m.s.s.w. Also, the influence on the amplifier of a gap between the semiconductor and the y.i.g. slab is discussed.

Characteristics of magnetostatic surface waves for a system of two magnetic films

physica status solidi (a)Volume 18, Issue 1 p. K53-K56 Short Note Characteristics of magnetostatic surface waves for a system of two magnetic films H. Pfeiffer, H. Pfeiffer Akademie der Wissenschften der DDR, Zentralinstitut für Festkörperphysik und Werkstofforschung, Institutsteil für magnetische Werkstoffe, JenaSearch for more papers by this author H. Pfeiffer, H. Pfeiffer Akademie der Wissenschften der DDR, Zentralinstitut für Festkörperphysik und Werkstofforschung, Institutsteil für magnetische Werkstoffe, JenaSearch for more papers by this author First published: 16 July 1973 https://doi.org/10.1002/pssa.2210180155Citations: 13AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume18, Issue116 July 1973Pages K53-K56 RelatedInformation

Characteristics of Magnetostatic Surface Waves for a Metalized Ferrite Slab

Detailed calculations of the characteristics of the magnetostatic surface waves in a ferrite slab with a metalized surface are presented. The region of validity of the effective boundary condition model (EBCM) discussed by Seshadri is established. It is shown that the dispersion characteristics of overlayed magnetic systems can be modified and tailored to have a variety of frequency-versus-wavenumber properties. In general the modes are lossy and the degree of damping depends critically on the characteristic lengths of the problem.