ISSN 0869-6632 (Print)
ISSN 2542-1905 (Online)

параметрическая неустойчивость

Influence of three-magnon decays on electromotive force generation by magnetostatic surface waves in integral YIG – Pt structures

The purpose of this work is to find out the influence of three-magnon decay processes on the electromotive force (EMF (U)) generated by propagating magnetostatic surface waves (MSSW) with the help of the inverse spin Hall effect in the “yttrium-iron garnet (YIG) – platinum (Pt)” structure. Methods. The experiments were carried out using the delay line structures based on YIG films with the thickness of 8.8 and 14.6 µm, on the surface of which antennas were formed for MSSWs excitation and reception and a Pt film between antennas. Results.

Влияние трехмагнонных распадов на генерацию ЭДС поверхностными магнитостатическими волнами в интегральных структурах ЖИГ-Pt

Исследовано влияние процессов трехмагнонных распадов на ЭДС (U), генерируемую за счет обратного спинового эффекта Холла в структуре железоиттриевый гранат (ЖИГ)-платина (Pt) бегущими поверхностными магнитостатическими волнами (ПМСВ). Эксперименты выполнялись с макетами линии задержки на основе пленок ЖИГ толщиной 8.8 и 14.6 μm на поверхности которых формировались антенны для возбуждения и приема ПМСВ и пленка Pt между ними.

Влияние направления магнитного поля на спектр выходных сигналов спиновых волн при трехмагнонном распаде поверхностных магнитостатических волн в кресте на основе волноводов из пленки железоиттриевого граната

Цель: Обнаружение влияния эффектов невзаимности на развитие параметрической неустойчивости спиновых волн (СВ) касательно намагниченных мультипортовых микроструктурах на основе пленок железоиттриевого граната (ЖИГ). Методы: Исследовалось влияние направления магнитного поля Н ⃗ на спектр выходных сигналов СВ 4-х портовой крестовидной структуры при возбуждении входным преобразователем поверхностной магнитостатической волны (ПМСВ) в условиях параметрической неустойчивости первого порядка (трехмагнонной).

Influence of first order parametric instability on formation of forbidden gaps in spectra of magnetostatic surface waves in one-dimensional ferrite magnonic crystal

Magnetostatic surface waves propagation in one-dimensional magnonic crystal obtained by etching of array of grooves (56 width, 0.66 deep, period 98 ) in yttriumiron garnet film of 4.1 thickness was investigated at first order (three-magnon) parametric instability. It was shown that forbidden gaps don’t form at region of magnonic crystal where propagation of magnetostatic surface waves is nonlinear because of destroy of phase synchronism of incident and reflected waves. 

Chaotic microwave pulse generation in wideband spin­wave and vacuum oscillators of chaos under external periodical influence

The non-autonomous generation of chaotic microwave pulses in the wideband chaos oscillators is experimentally investigated. Nonlinearity of a spin-wave transmission line is a cause of chaotic dynamics of the spin-wave chaos oscillator and nonlinearity of a TWT amplifier is a cause of chaotic dynamics of the other chaos oscillator. It is shown, that in both cases, the generation of chaotic microwave pulses is observed when an external pulsemodulated microwave signal has a certain power level and its carrier is detuned from a central frequency of a chaotic signal.

Noise induced parametric instability and stochastic oscillations in the oscillator with nonlinear dissipation

The appearance of the instability of oscillator equilibrium state in a case of noisy modulation of the natural frequency is considered in the work. The threshold of instability and the properties of stochastic oscillations arising over the threshold are studied for the different noise characteristics.

Influence of parametric instability of magnetostatic surface spin waves on formation of defect modes in one-dimensional magnonic crystal with defect

Propagation of nonlinear magnetostatic surface waves through the one-dimensional magnonic crystal based on yttrium-iron garnet film with the defect of periodic array was experimentally studied. Interest in the study of the magnonic crystals with defects is caused by the possibility of exciting of defect modes inside the forbidden gaps of MSSW spectrum that can be used to enhance the non-linear effects and signals control in the microwave range.