Solitonlike excitations localized around a point of pumping of an easy-axis ferromagnet by a circular rf magnetic field are investigated in the framework of the one-dimensional nonlinear Schrödinger equation and its discrete analog. The influence of damping on the character of the localized excitations and the stability of various types of such states are analyzed in a simplified piecewise-nonlinear model.
A design formula for direction pattern (DP) optimization of circular antenna array in the presence of intense clutter was obtained. DP with floor sidelobe of thick resonance vibrator circular antenna array was designed and investigated. DP of vibrators in the presence of antenna array was calculated by means of strict numerical -analytical algorithm.
The dynamics of a one-dimensional magnetic system in an external spatially localized high-frequency field were analyzed analytically (in the framework of perturbation theory and qualitative approach) and numerically. For the case of direct nonlinear resonance we found the dependence of local state amplitudes on the amplitude of the external field for different values of external field frequency and the damping parameter. Hysteresis character of the field dependence and the appearance of “instability windows”, where additional nutation of magnetic moments occurs, are also noted.
The nonlinear Schrödinger equation is used to study the propagation of small-amplitude nonlinear magnetic pulses (solitons) in an actively dissipative medium (easy-axis ferromagnet) in which an external, circularly polarized, rf magnetic field is applied in spatially localized regions. The interaction of solitons with nonlinearly excited regions of the medium which are coupled with rf pumping centers is studied in the adiabatic approximation. The change of the parameters of solitons during such an interaction is calculated and the possibility of amplification of soliton pulses is examined.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.