Three-Dimensional Magnetostatic Waves Caused by Electromagnetic Fields in Metallized Ferrite Plates
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THREE-DIMENSIONAL MAGNETOSTATIC WAVES CAUSED BY ELECTROMAGNETIC FIELDS IN METALLIZED FERRITE PLATES O. R. Hachkevych,1, 2, 3 M. T. Solodyak,1, 4 R. F. Terlets’kyi,1 and R. О. Ivas’ko1
UDC 539.3: 538.54
By using a well-known technique for finding the characteristics of magnetic fields based on the method of decomposition of unknown quantities in a series in small parameter (chosen as the ratio of amplitude of the tangential harmonic field to the amplitude of normal constant field) and restricting ourselves to the first two terms of decomposition, we establish the conditions of excitation and study the regularities of propagation of three-dimensional magnetostatic waves in metallized normally magnetized ferrite plates depending on the character of the external electromagnetic field and electrophysical characteristics of the material. Keywords: electromagnetic field, metallized normally magnetized ferrite plates, three-dimensional magnetostatic waves, frequency transmission band.
Introduction The theoretical and experimental investigations of the electrodynamic properties of media are an important part of radiophysics, in particular, in the field of spin-wave electronics. The high-frequency characteristics of magnetically ordered crystals attract attention due to the presence of spin excitations (waves and vibration), which may appear in these crystals. In recent years, the number of materials in which excitations of this kind may exist has increased due to the appearance of multilayer and inhomogeneous structures whose compositions contain ferro- and ferrimagnetic materials. The magnetically ordered substances can also play the role of a medium in which nonlinear and parametric phenomena occur due to the interaction of spin waves with each other and with the electromagnetic waves. The miniaturization of devices in superhigh-frequency (SHF) engineering is impossible without using longwavelength coherent dipole spin waves [the so-called magnetostatic waves (MSW)] in ferrite films excited and received with the help of narrow metallic conductors (antennas) located on the surfaces of the films. The type of the excited wave is determined by the direction of constant magnetic field. Magnetostatic waves substantially differ from the ordinary SHF electromagnetic waves by a broad frequency range (1–110 GHz), by the possibility of electric frequency retuning as a result of changes in the external constant magnetic fields, by a relatively low group velocity, by the possibility of control over the dispersion (by changing the geometric sizes of a waveguide or a resonator), by small losses, and by the simplicity of the methods of excitation and recording. In the literature, the conditions of excitation and propagation of MSW in the ferrite elements of electric devices have been comprehensively analyzed but the conditions of partial absorption of the energy of MSW by 1 2 3 4
Pidstryhach Institute for Applied Problems in Mechanics and Mathematics, Ukrainian National Academy of Sciences, Lviv, Ukraine. Corresponding author; e-mail:
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