V. I. Kostenko

The properties of hysteresis of ferro-magnetic resonance frequency-field dependence of barium-hexaferrite samples have been the subject for study. The main objective is to investigate experimentally features of high-frequency magnetic hysteresis in a wide range of thickness of samples. The experimental investigation has been carried out using the E...

In this work we study the properties of hysteresis of ferro-magnetic resonance frequency-field dependence in the samples of barium hexaferrite. The purpose of the study is the experimental investigation into the properties of high-frequency magnetic hysteresis within the wide range of the samples thickness. The experimental investigation was carrie...

Bandpass transmission line on the basis of uniaxial single-crystal hexaferrites in multidomain area has been proposed in this paper. This line can be used for experimental investigation of excitation and propagation of magnetostatic waves within millimeter wave range in uniaxial single-crystal hexaferrites as well as for designing of bandpass filte...

The effect of magnetic hysteresis in M-type hexaferrite single crystals has been studied experimentally. Earlier experimental data for the special aspects of the magnetic spectrum hysteresis, the parameters of which differ considerably from those of well-studied classical hysteresis, have been discussed. It has been shown that, after the nucleation...

Hybrid electromagnetic-spin oscillations in ferrite-dielectric structure consisting of a single-crystal BaFe12O19 platelet and a dielectric disk-shaped resonator in multidomain state of ferrite have been investigated by experiment. Experiments were conducted with different types of domain structures, and the frequency-field spectra were measured at...

Prototype of bandpass filter based on single-crystal platelet of hexaferrite in multidomain area with stripe domain structure in the initial state was proposed for the first time. Designed and experimentally studied filter has 3dB-bandwidth of 80 MHz within frequencies about 47 GHz in absence of external biasing magnetic field. The filter has inser...

The spectra of hybrid EMSOs in the composite ferrite-dielectric structure based on single crystal BaFe12O19 with the MDS in initial state were experimentally investigated. As it can be seen from Fig. 2 the fact of simultaneous hybridization of both MSOs modes ω1 and ω2 with DR electromagnetic mode one has been revealed. It should be emphasized that...

Self-biased millimeter wave (mm-wave) notch filter consists of a resonator based on single crystal barium hexaferrite (BaFe12O19), which is operated in the multidomain region has been realized and investigated. The filter is designed using the length of dielectric waveguide. Depending on the type of preliminary created regular domain structure in h...

Experimental investigations of FMR frequency-field dependencies of a single crystal barium hexaferrite (BaM) platelet in the case of in-plane bias field H0, i.e. H0 is oriented perpendicular to the easy axis (EA) both in the multi-domain and saturated state, are carried out. In the domain area the case of cylindrical magnetic domains (CMD) structur...

High-frequency characteristics of mm-range resonators produced from bulk single-crystal material and epitaxial films of barium hexaferrite doped with aluminum (BaFe11.1Al0.9O19 ) have been investigated in this study. It was shown that the composition of magnetostatic (MS) oscillations modes of the single-crystal resonator of BaFe11.1Al0.9O19 in a s...

In the paper for the first time it is shown that a single crystal barium hexaferrite with an easy axis (c-axis) lying in the sample plane can be used as a self-biased mm-wave ferrite resonator with two intensive resonances. It is experimentally established that the domain structure (DS) of this sample in a completely demagnetized state is the close...

In this paper it is considered an idea of application specificities of hysteresis loop of frequency-field dependence of ferromagnetic resonance of good monocrystal hexaferrite materials for creation of pulse-switchable resonator for millimeter wavelength range. The essence of principle of this device lies in possibility of quick change of the hexaf...

Spectra of magnetostatic oscillations in layered dielectric-ferrite-metal structures are studied theoretically and experimentally. Hybridization of the magnetostatic oscillations and dielectric resonant modes is experimentally investigated both under saturation and in the domain region in the presence of a cylindrical magnetic domain. The experimen...

The experimental investigations of the FMR frequency-field dependences at room temperature T=300 K and temperature of liquid nitrogen T=77K for the substituted sample of strontium hexaferrite SrFe11.2Al0.8O19 are presented. It is shown, that with decrease of temperature the difference dHhys between the field of saturation Hsat and the field of brea...

Features of behaviour of a high-frequency hysteresis loop depending on the value of magnetisation field are experimentally investigated. Mechanisms for explanation of this phenomenon are offered.

The use of features of a hysteresis loop of frequency-field curve of ferromagnetic resonance (FMR) of high-quality single-crystal sample SrFe12O19 offered for a creation of tunable microwave filter with a memory effect is proposed. Realization of the memory effect in such device consists of throwing of frequency of FMR in going of the sample from m...

The hysteresis of the frequency-field dependences of ferromagnetic resonance is experimentally studied in the range of the transition from a domain into a saturated state and in the reverse direction in normally magnetized epitaxial films and plates of barium hexaferrite. The experimental results are compared with local magnetic hysteresis loops.

The high-frequency and static processes of reversal magnetization are experimentally investigated in the single-crystal specimens of strontium hexaferrites (SrFe12O19). Good coincidence of dynamic and static dependences has been obtained at the transition from homogeneous (saturated) in the domain state.

The coupled oscillations are theoretically and experimentally investigated in the composite solid-state resonators (ferrite-dielectric structure). The experiments have been conducted for barium ferrite (BaFe12O19) and strontium hexagallate (SrGa12O19) plates in the saturation region. The calculation is carried out for the first four magnetostatic m...

We have confirmed experimentally the possibility to use the plates of uniaxial hexaferrites with domain structure (DS) as a resonant elements for functional units of SHF electronics. It is shown that the Q-factor of such structures with active element made of barium hexaferrite does not differ in the domain region from that of a resonant element wh...

The Magnetic Potential Well (MPW) phenomenon is the ability of two spaced magnets to change spontaneously attraction into repulsion by the decrease in the spacing between them - this phenomenon is demonstrated by tests. Proof of MPW-existence with talking into account the coil diamagnetism; manifestation of MPW when the superconductivity is destroy...

Coupled ferrite-dielectric oscillations (FDO) in the epitaxial film of uniaxial barium hexaferrite in a domain area (DA) and at saturation have been investigated theoretically and experimentally. For the first time the hybridization of high-frequency branch of FMR with a dielectric resonance mode have been found with the presence of magnetic bubble...

Frequency-field dependences of absorber spectrums and static hysteresis curves in normally magnetized epitaxial films and bulk monocrystals of barium hexaferrite (BaFe12O19) are investigated by tests. Experimental data in the transition range from multidomain state before saturation and vice versa are compared.

The influence of ferrite layer thickness on FMR parameters under easy-axis magnetization in BaFe12O19 samples has been investigated experimentally. Comparison has been made with the theory of magnetostatic oscillations for plane-parallel domain structures in barium hexaferrite epitaxial films and bulk monocrystals.

The magnetic parameters of epitaxial barium hexaferrite films are studied. The hysteresis of the field and frequency dependences of ferromagnetic resonance in the films is investigated in the ranges of the multidomain-monodomain and monodomain-multidomain transitions. The effect of the substrate thickness on film-microwave field interaction is exam...

Experimental researches of magnetic hysteresis of ferrite resonators in a frequency region 40-60 GHz on the basis of monoaxial barium ferrites are presented

Ferrite resonators are rather commonly used in tuneable filters and oscillators in the microwave range. The characteristics of millimeter-wave range resonators made of thin platelets of barium ferrite with bubble and stripe domains are considered.

For the first time, the aluminum-replaced epitaxial barium hexaferrite films BaFe12-xAlxO19 were studied that were grown on the strontium hexagallate substrate with thickness 400 μm. The crystallographic anisotropy field, ferromagnetic resonance line width and resonance field were experimentally determined. It is shown that the replacement degree x...

The theory of magnetostatic waves propagating along the domains is introduced. It is shown that only uniform-surface and volume-uniform waves may exist. In the case kx → 0 we obtain two FMR frequencies: the low-frequency mode ωlf as a limiting case of volume-uniform waves and the high-frequency mode ωhf of uniform-surface waves. Comparison with the...

A theory of the magnetostatic oscillations in a bubble lattice, based upon the application of a new boundary condition on the surface of the elementary cell is introduced. In the thick plate approximation four branches of resonance oscillations nonuniform in the (ϱ ϕ) plane and uniform in the normal (z) direction are obtained. It is shown, that in...

An experimental study of the waveguide excitation of magnetostatic waves in epitaxial yttrium iron garnet films in the 3-cm range and in single-crystal barium ferrite slabs in the 48-60 GHz frequency range is reported. The method is described and the experimental arrangement is shown. The spectra of magnetostatic oscillations in a slab are shown fo...

The solution of the problem of the magnetostatic energy of a bubble domain lattice in an infinite plate of an uniaxial highly anisotropic crystal is used to investigate the influence of the plate thickness on the external-field dependence of ferromagnetic resonance frequencies. The calculation and a comparison with the experimental results are made...