Surface magnetostatic modes of a ferrite slab
01 Mar 1970-Vol. 58, Iss: 3, pp 506-507
TL;DR: In this paper, the wavenumber and the group velocity of the magnetostatic surface wave guided by a ferrite slab magnetized parallel to its face were investigated and an aspect of experimental observation of the group delay times of the magnetic wave supported by a metal plate placed against one of the faces was explained.
Abstract: The wavenumber and the group velocity of the magnetostatic surface wave guided by a ferrite slab magnetized parallel to its face are investigated. One aspect of experimental observation of the group delay times of the magnetostatic surface waves supported by a ferrite slab without and with a metal plate placed against one of the faces is explained.
Citations
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TL;DR: In this paper, a dielectric layered structure consisting of an epitaxial YIG film separated from a conductive plane by a thin Dielectric layer is considered, and an expression for the characteristic dispersion is derived.
Abstract: The presence of a conductive plane near a thin magnetic film perturbs the propagation of a surface magnetostatic wave. This paper treats the case of a dielectric layered structure, and an expression for the characteristic dispersion is derived. The dispersion is unique with respect to magnetostatic propagation in that it is nonreciprocal and nonmonotonic. A dielectric layered structure consisting of an epitaxial YIG film separated from a conductive plane by a thin dielectric layer is considered theoretically. Experimental results for this structure are given for dispersion and insertion loss.
152 citations
TL;DR: In this paper, the dispersion relation of magnetostatic surface waves propagating in a ferromagnetic film of finite dimensions is derived and a consideration of the finite width of the sample is introduced.
Abstract: The dispersion relation of magnetostatic surface waves propagating in a ferromagnetic film of finite dimensions is derived. Specifically, a consideration of the finite width of the sample is introduced to the previous treatments of magnetostatic surface‐wave propagation. The inclusion of a finite width produces a multiplicity of propagating modes, which can be excited individually or collectively, depending on experimental conditions. In addition, the finite width allows the excitation of magnetostatic volume waves, which exist over a narrow frequency range just below the range of magnetostatic surface waves. All aspects of the theoretical analysis are supported by measurements made on magnetostatic surface‐wave propagation at frequencies around 1 and 9 GHz in yttrium iron garnet samples of different widths.
138 citations
TL;DR: In this article, the authors demonstrate laser-induced non-reciprocity of spin waves in the ferromagnetic-semiconductor structure of yttrium iron garnet film grown at the top of $n$-type gallium arsenide substrate.
Abstract: We demonstrate laser-induced nonreciprocity of spin waves in the ferromagnetic-semiconductor structure. Surface spin waves in yttrium iron garnet film grown at the top of $n$-type gallium arsenide substrate were studied by means of Brillouin light-scattering spectroscopy. It is shown that spin-wave dispersion can be modified in a controlled manner by laser radiation. We observe the difference of up to 225 MHz when comparing the frequencies of counterpropagating spin waves. We attribute this frequency shift to the mutual influence of nonreciprocal spin-wave modal profiles and differences in magnetic anisotropies at two film surfaces as the result of laser-induced conductivity variation in GaAs substrate. We propose a simple model based on analytical dipole theory to describe the induced spin-wave nonreciprocity. Our results show the possibility of integration of magnonics and semiconductor electronics on the base of YIG/GaAs structures.
86 citations
01 May 1976
TL;DR: Low-loss magnetostatic wave propagation in epitaxial yttrium iron garnet (YIG) films allows the development of a technology which is complementary to that of surface acoustic waves (SAW's), but capable of operation in the microwave range from 1 to greater than 12 GHz as mentioned in this paper.
Abstract: Low-loss magnetostatic wave (MSW) propagation in epitaxial yttrium iron garnet (YIG) films allows the development of a technology which is complementary to that of surface acoustic waves (SAW's), but capable of operation in the microwave range from 1 to greater than 12 GHz. Experimental low-loss dispersive and nondispersive tapped delay lines are described. Future developments of MSW's involving signal routing by etched waveguides and periodic resonator structures are discussed, and the properties of MSW's at microwave frequencies are compared with those of SAW's at VHF/UHF.
77 citations
TL;DR: In this paper, the non-reciprocal properties of spin waves in metallized one-dimensional bi-component magnonic crystal composed of two materials with different magnetizations are investigated numerically.
Abstract: The nonreciprocal properties of spin waves in metallized one-dimensional bi-component magnonic crystal composed of two materials with different magnetizations are investigated numerically. Nonreciprocity leads to the appearance of indirect magnonic band gaps for magnonic crystals with both low and high magnetization contrast. Specific features of the nonreciprocity in low contrast magnonic crystals lead to the appearance of several magnonic band gaps located within the first Brillouin zone for waves propagating along the metallized surface. Analysis of the spatial distribution of dynamic magnetization amplitudes explains the mechanism of dispersion band formation and hybridization between magnonic bands in magnonic crystals with metallization.
71 citations
References
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TL;DR: In this paper, a thin slab magnetized in its plane is obtained in the magnetostatic limit and the mode distribution in wave-vector space is obtained for both the volume and surface modes, and the dependence of mode density on wavelength is discussed.
1,351 citations
TL;DR: In this paper, the spatial configuration of the magnetostatic modes of a ferromagnetic body was examined and it was shown that those modes whose frequency lies between ε(n ϵ) and ϵ(1 2 ) are surface modes.
Abstract: Examination of the spatial configuration of the magnetostatic modes of a ferromagnetic body shows that those modes whose frequency lies between $\ensuremath{\omega}=\ensuremath{\gamma}{({B}_{i}{H}_{i})}^{\frac{1}{2}}$ and $\ensuremath{\omega}=\ensuremath{\gamma}({H}_{i}+2\ensuremath{\pi}M)$ are surface modes. It is also found that the complete spin-wave spectrum consists of a set of surface spin waves in addition to the spin-wave band usually considered. The magnetostatic mode spectrum thus merges smoothly into the spin-wave spectrum.The characteristic equation for the surface modes on a plane surface at an arbitrary angle to the applied dc field is given. The properties of the surface modes on plane surfaces and on spheroidal bodies are discussed.
135 citations
TL;DR: Magnetostatic surface waves are identified in microwave-frequency experiments with a single-crystal y.i.w. slab as mentioned in this paper, and fast waves with k numbers low in the range are observed in a c.
Abstract: Magnetostatic surface waves are identified in microwave-frequency experiments with a single-crystal y.i.g. slab. Slow travelling waves having k numbers that are high in the magnetostatic range are studied in a pulse experiment, and fast waves with k numbers low in the range are observed in a c.w. test.
71 citations