Microwave solitons in magnetic garnet films (invited)

Abstract

This work concerns some recent results on the excitation of solitons at microwave frequencies in planar magnetic films. In particular, yttrium iron garnet (YIG) possesses the intrinsic properties of dispersion and nonlinearity required for a system to support such a kind of waves. In this framework, experimental results on a novel nonlinear effect, related to the propagation at about 7 GHz of magnetostatic volume waves in YIG films having thicknesses ranging between a few microns to more than 100 μm, have been interpreted in terms of a solitonic excitation process. By starting from those findings, this paper presents an analysis of the experimental aspects as a function of the various parameters involved (i.e., thickness, frequency, wave vector, and so on) together with a concise discussion with respect to the presently available theoretical approaches.