Yu.P. Sharaevsky

Field-Controlled Phase-Rectified Magnonic Multiplexer

The mechanism used to alter the features of propagating spin waves is a key component underpinning the functionality of high-frequency magnonic devices. Here, using experiment and micromagnetic simulations, we demonstrate the feasibility of a magnonic multiplexer in which the spin-wave beam is toggled between device output branches by the polarity of a small global bias magnetic field. Due to the anisotropy inherent in the dispersion of magnetostatic spin waves, the phase fronts of the output spin waves are asymmetrically tilted relative to the direction of the beam propagation (group velocity). We show how the phase tilts could be (partly) rectified in the magnonic waveguides of variable widths.

Generation of a stationary train of chaotic soliton-like microwave pulses in self-oscillating ring systems with a ferromagnetic thin film

The generation of a stationary train of chaotic soliton-like microwave pulses has been observed in an isolated self-oscillating ring system with a ferromagnetic thin-film and a resonator. The pulses have been formed owing to three-wave parametric processes and modulation instability of a surface magnetostatic wave. The soliton-like character of the microwave pulses is indicated by the time dependence of the instantaneous phase of the signal envelope.

Spatiotemporal dynamics of magnetostatic and spin waves in a transversely confined ferrite waveguide

Spatiotemporal dynamics of the multimodal propagation of magnetostatic waves in a transversally confined ferrite waveguide and the parametric excitation of spin wave under conditions of three-magnon decay processes are experimentally investigated by the Brillouin spectroscopy.

Emission of Noise-Like Spin Wave Packets in the Presence of Three-Magnon Decay Processes and the Kinetic Instability of Waves in a Ferromagnetic Film

The features of spin wave emission from a ferromagnetic film in the direction of the propagation of a surface magnetostatic wave have been experimentally investigated at various input signal powers. Radiation in the form of two noise-like spin wave packets has been detected near the frequency corresponding to half the pump frequency. This radiation is caused by three-magnon processes of the decay of a surface magnetostatic wave and by the kinetic instability of spin waves.

Modification of complex conditional optimization method by box for definition of slow wave structure sizes using given electrodynamic characteristics

The results of development of an effective search method of a global extremum for the decision of a problem of definition of the slow wave structure sizes such as a coupled cavity chain on the given electrodynamic characteristics or equivalent parameters are presented. Results of definition the slow wave structure sizes on given dispersion and interaction impedance are adduced

Forced and own waves of coupled cavity periodic structure

The results are presented of an investigation of the forced waves of a coupled cavity periodic structure of final length, i.e., results of research of forced waves in slow wave structures with inductive coupled cavities. The results establish the character of the change of the field amplitude and phase distribution of the system on the forced wave frequencies that are not equal to the self frequencies of the system. For the estimation of the efficiency of interaction of an electron beam with the field of a coupled cavity periodic structure with the transitional matching arrangement in a wide band of frequencies, it is necessary to take into account not only the character, but also the value, of change of distribution of amplitude and phase of a field on the length of system by propagation to its own and, especially, the forced waves.

Conversion of magnetostatic spin waves propagating through a junction of magnonic waveguides

Wave channeling is an important problem for signal processing systems and communications within both optical and microwave frequency ranges [1-3]. In optics, the propagation path of a light can be controlled e.g. via the total internal reflection or in photonic crystal fibers. Thus, the simplest problem of wave channeling - turning a wave round a corner - is trivial in photonics, which is due to the isotropy of the optical dispersion. In magnonics [4], in contrast, the information carriers are spin waves, which have a strongly anisotropic dispersion. As a result of this, the magnonic group and phase velocities are non-collinear, while the relationship between them depends strongly on the orientation of the magnetization and the strength of the applied magnetic field. In principle, bends could be avoided in architectures in which magnonic waveguides form right angles at the junctions. However, the same anisotropy then poses another problem - that of conversion between the magnetostatic surface spin waves (MSSWs) and backward volume magnetostatic spin waves (BVMSWs), which have their wave vectors perpendicular and parallel to the direction of the magnetization, respectively.

Excitation and propagation of spin waves in ferromagnetic films at the first order parametric resonance

In the paper the excitation and propagation features of spin waves at the first order parametric resonance are discussed on the basis of experimental and theoretical results. These results are obtained in the case, when the electromagnetic or magnetostatic wave is a pump wave.

Modulated Signal Propagation Through Resonant Transmission Line on Magnetostatic Waves

The main features of pulse-modulated signals and frequency-modulated signals propagation through resonant transmission line on magnetostatic waves are analyzed with using nonlinear model. Calculation results are compared with experimental data.

Broadband Chaotic Signal Oscilator for Microwaves on the Basis of Nonlinear Magnetostatic Wave Transmission Line

Presented in this paper is experimental research regarding the possibility of chaotic signal broadband generation in the microwave ring self-sustained oscillator, including solid state power amplifier and broadband nonlinear transmission line on the basis of ferromagnetic film at various types of magnetostatic wave excitations.