Abstract
Abstract This chapter considers some of the typical solitonic phenomena that have been investigated in recent years for nonlinear spin waves propagating in the yttrium iron garnet (YIG) films, as well as some of their possible technological applications at microwave frequencies. Topics include a comparative overview of the spectral properties of pure dipolar and dipole-exchange spin waves in thin ferromagnetic films and ferromagnetic-film-based magnonic crystals. In order to consider solitonic phenomena, the nonlinear Schrodinger equation and the nonlinear Landau–Ginzburg equation are introduced. Fundamental experiments on spin-wave envelope soliton train generation through self-modulation, induced-modulation, and coupled-modulation instabilities in YIG films are presented. Also, a chaotic behavior of microwave envelope soliton pulse sequences observed in thin YIG films are described. The chapter also discusses novel microwave signal-processing devices, such as a nonlinear phase shifter and interferometer, having the principal of operation based on nonlinear spin-wave phenomena appearing in thin YIG films.
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