We considered the possibility of detecting a combined two-frequency effect of an alternating magnetic field in a ferrite plate. The main attention is paid to the properties of excited elastic oscillations when changing the magnitude of the alternating field and the plate thickness. The character and features of the magnetic and elastic oscillations excitation under resonance conditions at a difference frequency in linear and nonlinear cases are considered. It is noted that detection at the difference frequency has a pronounced nonlinear character, since it occurs only at a sufficiently high excitation level. The efficiency of elastic oscillations excitation at the difference frequency under various parameters of material and conditions has been evaluated.

The task about interaction of super-short light pulse on magnetoelastic system which has precession motion of magnetization is investigated. As a main mechanism it is investigated the decreasing of magnetization with power light action on spin system. It is investigated the development of magnetization precession by the action of light pulse. It is found that during the pulse action the amplitude vibrations is decreased and its frequency is increased. It is investigated the precession development in different meanings of light power. It is established the multi-regime character of magnetization vibrations by small pulse duration which is the same order as signal excitation period. It is established three regimes: regime №1 – stabile vibrations, regime №2 – the destroy of stabilization, regime №3 – shock excitation. It is established that the main distinguishing of regime №3 from first two regimes is the sharp jump increasing of amplitude as magnetic so the elastic vibrations which take pulse as a result of pulse action. It is found that as a result of high power long duration pulse it is arising the regime of in-flatness magnetic component stabilization. It is found that the main role in formation of this regime plays the magnetoelastic interaction.

The nonlinear magnetization precession in normal magnetized ferrite film which has magnetic, elastic and magnetoelastic properties is investigated. The excitation field is presented as a vibration on resonance frequency which is modulated by short pulses which frequency is more lower than resonance frequency. It is proposed the formation procedure of periodic succession of ultra-short pulses by the involution to even degree of modulation signal sine. It is found two different cases of excitation: first when modulate pulse duration is larger than initial signal period and second when modulate pulse duration is smaller than initial signal period. In the first case the modulated signal has the form of main frequency vibrations tandem and in the second case the modulated signal has the form of unit sign-variation pulse. It is investigated the time development of magnetic and elastic vibrations whish are firmed by excitation field. It is shown that in the first case the magnetization vibrations at first hat sharp jump to upward and after this decreases by exponent. In this case the elastic vibrations after the same jump at first increases and then decreases by exponent. The elastic vibrations behaviour is interpret as energy pump from magnetic system to elastic system. In the second case the initial jump both vibrations is absent. It is investigated the degree modulation index influence to excited vibrations. It is shown that by increasing of this index the amplitude of magnetic and elastic vibrations decreases. It is investigated the magnetization excited vibrations character by different degree of magnetoelastic connection. It is introduced the coefficient multiple of magnetoelastic constant which is equal to ratio of considered constant to value of magnetoelastic constant of yttrium iron garnet. It is shown that by increasing of multiple coefficient the magnetization vibrations period is increased. It is found the sharp increasing the period by determined value of multiple coefficient which has a threshold character. It is investigated the excitation of magnetization in large time interval when the multiple coefficient is above the threshold value. It is found the principle difference between two cases when pulse duration is large or smaller as alternating field period. It is shown that in the first case the magnetization vibrations has the character of equilibrium position precession in conditions of orientational transition. In the second case the magnetization vibrations has the form of periodic re-orientational jumps from one equilibrium position to another. It is mentioned some properties of observed phenomena and proposed some recommendations for further investigations.

The parametric excitation of non-stationary magnetoelastic vibrations in magnetostriction converter by action of light from femto-second laser is investigated. The scheme of sine modulation of saturation magnetization is investigated. It is found two regimes: sign-constant and sign-varied. It is shown that by sign-varied modulation it is organized sharp pronounced non-stationary delay splash of amplitude magnetic and elastic vibrations. It is shown that in mechanism of splash formation the mast role plays magnetoelastic interaction. It is investigated the splash amplitude dependences from magnetoelastic constant, parameters magnetic and elastic relaxation, constant field value and thickness of magnetoelastic plate. It is investigated the splash structure by variation of step in time. It is shown that the step variation causes to changing of splash position in time and its amplitude so as splash has fractal character. It is proposed some recommendations for work development.

The nonlinear dynamics of the magnetic and elastic subsystems of an yttrium iron garnet film excited by an alternating frequency-modulated magnetic field has been studied. The possibility of demodulating a frequency-modulated signal on a microwave magnetostrictive film transducer has been considered. The dependence of the excitation of oscillations of a magnetization vector and elastic displacements on the material and excitation parameters has been determined.

The authors demonstrate the possibility of using a magnetostrictive transducer to detect a frequency-modulated microwave signal. Elastic and magnetization oscillations of a ferrite film with crystallographic anisotropy are considered. The influence of the orientation of the crystallographic cell on the dynamics of the magnetoelastic system, the establishment of various oscillations modes, and the detection process are analyzed.

In this paper, we consider the problem of generation of hypersonic oscillations in the circuit of a magnetostrictive converter covered by a positive feedback circuit. A “coupling parameter” that reflects the amplification of the signal in the feedback loop was introduced. The development of magnetic and elastic oscillations in time is considered. As the coupling parameter increases, three main oscillation modes are revealed: initial relaxation, stationary self-oscillations, and chaotic self-oscillations. The effect of the coupling parameter and the damping parameter of the magnetization on the time of development and the amplitude of oscillations was studied. The characteristic values of both parameters corresponding to transitions between modes are revealed. Practical recommendations for choosing system parameters for the most efficient excitation of hypersonic oscillations are given.

A study is performed of oscillations of magnetization and elastic oscillations in a YIG film. Parametric portraits are presented for oscillations of the vector of magnetization, time sweeps of elastic oscillations, and their amplitude–frequency characteristics at different depths of modulation and strengths of an ac magnetic field. The dependences on the modulation depth and the amplitude of the alternating field are also given. The conditions for effective detection of external magnetic field oscillations are determined.

A numerical model is created of the magnetoelastic dynamics of a three-layer ferromagnetic structure excited by a microwave magnetic field. Portraits are constructed of the precession of magnetic oscillations. Values of the layer parameters and field amplitudes are determined for the maximum transfer of energy from the magnetic subsystem to the elastic subsystem of the three-layer structure.

Oscillations of the magnetoelastic subsystem of a ferrite film excited by an amplitude-modulated alternating magnetic field are studied. The possibility of detecting oscillations at the modulation frequency due to the magnetostrictive properties of the magnetic film is considered. The dependence of the excitation of magnetic and elastic dynamics on the material and excitation parameters, including the type of polarization of an alternating magnetic field, is determined.

The detection of an amplitude-modulated magnetic linearly polarized alternating field on the elastic subsystem of a magnetic film is considered. The dynamics of oscillations of the magnetization vector and elastic displacement of an isotropic film and films with different orientations of the easy axes of cubic anisotropy with respect to the normal is studied. Parametric patterns of oscillations of magnetization vector components and frequency characteristics of excited oscillations of magnetization and elastic displacement are constructed. The dependence of the oscillation modes of the elastic displacement of the magnetic film on the amplitude of the alternating magnetic field strength and the modulation index is determined.

Features of the nonlinear dynamics of magnetic and elastic subsystems are studied upon the generation of hypersonic oscillations excited by an alternating magnetic field oriented in the film plane.

Настоящая работа посвящена выявлению особенностей нелинейной динамики магнитной и упругой подсистем при генерации гиперзвуковых колебаний, возбужденных переменным магнитным полем, ориентированным в плоскости пленки.

The present work deals with investigation of a nonlinear magnetization vector precession and elastic displacements close to the ferromagnetic resonance in a two-layer normal magnetized ferrite plate. The system of ordinary differential equations is solved numerically by means of the Runge-Kutta 7-8 orders method with control of the integration at every step length. The authors defined typical peculiarities of development in magnetoelastic oscillations processes in the sample layers that have different characteristics. The distribution of magnetoelastic oscillations in the two-layer plate was also studied. Inside the sample the maximum amplitudes of magnetoelastic oscillations were determined. The possibility of excitation of autooscillations and chaotic magnetoelastic oscillations was determined and describe by authors.