The present work is devoted to the study of the optically induced formation of the band structure of a magnon crystal consisting of a ferrite microwave diode loaded with a semiconductor with periodic thickness modulation. Using the Brillouin light scattering method, it is demonstrated that an increase in the power of laser radiation illuminating the semiconductor layer leads to the formation of non-transmission bands in the spectrum of surface magnetostatic waves (PMSW) with a simultaneous increase in the central frequency of these bands. Using the finite element method, we connected the formed non-transmission bands with the Bragg resonances of the periodic structure, and also evaluated the effect of changes in the density of semiconductor electrons on the dispersion dependences and non-reciprocal properties of PMSV in such a structure.

Методом ионно-лучевого распыления–осаждения получены слоистые структуры в виде субмикронных слоев никеля на монокристаллических подложках сегнетоэлектрика ниобата лития LiNbO 3 . В данных структурах при комнатной температуре наблюдается интерфейсный магнитоэлектрический эффект, максимальная величина которого в поперечной конфигурации магнитного и электрического полей составляет 108, а в продольной – 4 мВ/А. На основании анализа механических деформаций сделан вывод о значительном вкладе интерфейса в магнитоэлектрическое взаимодействие в полученных структурах Ni/LiNbO 3 . Данные материалы могут найти применение при разработке устройств пьезотехники, а также акустической, оптической и спин-волновой электроники.

In the layered ferromagnetic /ferroelectric structures in the form of cobalt, nickel or permendur layer on a ferroelectric substrate of lead zirconate titanate obtained by ion-beam sputtering – deposi-tion, relative strains due to mismatch of crystal lattices of mating materials at the metal / substrate in-terface make a more noticeable contribution to the magnetoelectric response than those associated both with the magnetostriction of the ferromagnetic layer and with the piezoelectric effect of the fer-roelectric substrate. The structures obtained are characterized by the thermal stability and reproduci-bility of magnetoelectric characteristics and can be used as converters of magnetic and electrical quantities, for example, in magnetic field sensors and actuators.

Gold films with a thickness of several tens of nanometers were obtained on silicon and quartz substrates by ion-beam deposition – sputtering. It is shown that the predominant lateral growth of nanoscale metal layers along the substrate surface occurs under exposure to the high-energy component of the sputtered atoms flux. The decisive role in the nanometer gold film for-mation is played by the elastic collision of sputtered metal atoms with atoms of the substrate and the growing film. The application of the manifold deposition – sputtering operation allows sup-pressing the grain formation process and obtaining gold films with better characteristics than those with a single deposition.

With the help of micromagnetic modeling, we considered particularities of dispersions and amplitude-frequency response of spin waves in a magnonic crystal (MC) formed by etching an array of grooves in the surface of yttrium iron garnet film having linear distribution of magnetization across the thickness from 1.7 kG at the upper surface till 2.02 kG at the bottom. For the geometry of surface magnetostatic spin waves (MSSW), it is shown that nonuniformity of magnetization distribution across the thickness leads to the appearance of frequency regions in the MC spectrum where MSSW propagation is unidirectional and, as the consequence, does not have Bragg resonances. It was also demonstrated that the MC spectrum is determined by the choice of surface used for the formation of the array of grooves.

Yttrium iron garnet (Y 3 Fe 5 O 12 , YIG) films ~2 μm thick with a nanosized TiO 2 buffer layer on ferroelectric PbZr 0.45 Ti 0.55 O 3 (PZT) and Ba 0.4 Sr 0.6 TiO 3 (BST) ceramic substrates were obtained by ion beam sputter deposition with a mixture of argon and oxygen ions. The produced heterostructures were crystallized in air at 820°С for 5 min. X-ray powder diffraction and characteristic X-ray radiation studies determined that the Y 3 Fe 5 O 12 film in the heterostructures is single-phase, and its elemental composition is the same as the given one. Magnetic measurements showed that the saturation magnetization of the YIG layer on the ferroelectric substrates is reached in a field of 0.2 T and is 0.70–0.85 of the saturation magnetization of bulk single-crystalline Y 3 Fe 5 O 12 .

Yttrium iron garnet (Y3Fe5O12, YIG) films ~2 μm thick with a nanosized TiO2 buffer layer on ferroelectric PbZr0.45Ti0.55O3 (PZT) and Ba0.4Sr0.6TiO3 (BST) ceramic substrates were obtained by ion beam sputter deposition with a mixture of argon and oxygen ions. The produced heterostructures were crystallized in air at 820°С for 5 min. X-ray powder diffraction and characteristic X-ray radiation studies determined that the Y3Fe5O12 film in the heterostructures is single-phase, and its elemental composition is the same as the given one. Magnetic measurements showed that the saturation magnetization of the YIG layer on the ferroelectric substrates is reached in a field of 0.2 T and is 0.70–0.85 of the saturation magnetization of bulk single-crystalline Y3Fe5O12.

The effect of elastic deformations on the ferromagnetic resonance spectrum of submicron polycrystalline films of yttrium iron garnet obtained by ion-beam sputtering on silicon and gallium arsenide substrates was studied. Magnetoelastic constants of the films on both substrates were calculated using the magnitude of the frequency shift of the absorption maximum in the ferromagnetic resonance spectrum. The value of constants did not exceed 16% of the known values for bulk polycrystalline garnet. The approach to increase the efficiency of electrical frequency tuning in composite multiferroic structures based on combination of static and dynamic (caused by the piezoelectric effect) deformations was proposed.

Представлены результаты исследований магнитных и магнитооптических свойств тонких пленок и наноструктур, предназначенных для разработок интегрально-оптических невзаимных устройств. Проанализированы возможности применения магнитооптических устройств в быстродействующих нейро-морфных системах.

The frequency dependences of the transmission coefficient of surface magnetostatic waves (SMSW) propagating in subwavelength magnonic structures obtained by deposition of 1D and 2D thin-film metastructures based on a 40-nm-thin permalloy film on the surface of an yttrium–iron garnet (YIG). These structures lead to a modulation of the damping and the effective internal magnetic field in the YIG film in the frequency range 1–10 GHz typical for studying SMSW in YIG films. The possibility of controlling the parameters of SMSW forbidden band by choosing the magnetization direction in the structure plane with respect to its symmetry axes.

The frequency dependencies of the transmission coefficient of surface magnetostatic waves (SMSW) propagating in subwavelength magnonic structures obtained by depositing of 1D and 2D thin-film metastructures based on a permalloy film 40 nm thick onto the surface of yttrium iron garnet (YIG) film were experimentally studied. Such structures in the frequency range 1–10 GHz (typical for the study of SMSW in YIG films) lead to modulation of attenuation and the effective internal magnetic field in the YIG film. The possibility of controlling the parameters of the bandwidth of the SMSW by the choice of the direction of magnetization in the plane of the structures relative to their axis of symmetry is shown.

We have analyzed the self-action effects in the propagation of surface magnetostatic wave (SMSW) pulses in a 1D magnonic crystal–dielectric–metal structure in which the region of anomalous dispersion controlled by the selection of thickness h of the insulator and ensuring the fulfillment of the Lighthill criterion in the generation of SMSW solitons is formed. It is shown that when the metallization-induced region of anomalous dispersion coincides with the Bragg resonance frequency range, no SMSW solitons form.

The influence of self-action effects on the magnetostatic surface waves (MSSW) pulses propagating in the structure of a one-dimensional magnonic crystal - dielectric - metal, where the choice of dielectric thickness forms an anomalous dispersion region that provides the fulfillment of Lighthill criterion on MSSW solitons formation, is studied. It is shown that in those cases when the portion of anomalous dispersion caused by metallization coincides with the frequency range of Bragg resonance, MSSW solitons are not formed.