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Dive into the research topics where B. B. Krichevtsov is active.

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Featured researches published by B. B. Krichevtsov.


Journal of Applied Physics | 2008

Ferroelectric betaine phosphite films: Growth, optical imaging, and dielectric properties

E. V. Balashova; B. B. Krichevtsov; V. V. Lemanov

Polycrystalline films of betaine phosphite (BPI) were grown by evaporation method on SiO2 and LiNbO3 substrates with interdigital transducers. Large (∼1 mm) single-crystalline blocks were visualized in a polarizing microscope in the reflection mode. Temperature dependences of the film capacity at frequencies 120 Hz–1 MHz exhibit a strong maximum at the temperature of the ferroelectric phase transition of BPI bulk crystals. The effect of a bias electric field was studied. Temperature variations in dielectric permittivity and electric field effect are analyzed using a thermodynamic model accounting for the substrate-film interaction.


Ferroelectrics | 1994

Linear magnetoelectric effect in magnetic garnet thin films

B. B. Krichevtsov; V. V. Pavlov; R. V. Pisarev; A. G. Selitsky

Abstract Linear magnetoelectric effect (ME) in epitaxial iron garnet films of (YBiPrLu)3 (FeGa)5O12 composition has been studied by means of optical polarimetric method with spatial resolution ∼2.5 μm. The measurements were carried out in both longitudinal H∥E and transversal H⊤E geometry for films grown on the substrates of (111) and (210)-orientation. The magnitude of ME effect within individual magnetic domain and originated from domain wall movement is evaluated. The strong anisotropy of ME effect in transversal geometry in (210)-films was observed in the regime of rotation of magnetization. The electric field induced changes of magnetic anisotropy parameters responsible for the observed effects are evaluated.


Integrated Ferroelectrics | 2009

GROWTH, OPTICAL IMAGING AND DIELECTRIC PROPERTIES OF FERROELECTRIC BETAINE PHOSPHITE AND TRIGLYCINE SULPHATE FILMS

E. V. Balashova; B. B. Krichevtsov; V. V. Lemanov

ABSTRACT Polycrystalline films of betaine phosphite (BPI) and triglycine sulphate (TGS) were grown by the evaporation method on different substrates (α-SiO2, α-Al2O3 and LiNbO3 with interdigital transducers, and Al/SiO2). Large (∼1 mm in BPI and ∼0.2 mm in TGS) single-crystalline blocks were visualized in a polarizing microscope in the reflection mode. Blocks are characterized by preferable in-plane orientation of the ferroelectric axis. Temperature dependences of the BPI and TGS film capacity at frequencies 120 Hz–1 MHz exhibit a strong maximum at the temperature of the ferroelectric phase transition of bulk crystals. The effect of a bias electric field on the dielectric constant and losses was studied. Description of dielectric properties is carried out using Landau-Ginsburg-Devonshire model with account of film-substrate interaction. Low frequency conductivity in BPI films is related to DC conductivity due to thermo-activation process with activation energy Eact ∼ 0.1 eV. AC conductivity associated with the hoping mechanism and the combination DC and AC conductivity was found in TGS films on Al/SiO2 substrates and α-Al2O3 substrates correspondingly.


Ferroelectrics | 2012

Structural and Dielectric Properties of Glycine Phosphite Thin Films

E. V. Balashova; B. B. Krichevtsov; G. A. Pankova; V. V. Lemanov

Thin polycrystalline films of amino acid ferroelectrics glycine phosphite (GPI) have been prepared by evaporation method on NdGaO3(001) substrate with interdigital structure of electrodes deposited on the surface. Optical images of films obtained by means of polarized microscope in reflection mode have shown that the films consist of small single crystal blocks of several tens of microns in size. X-ray diffraction analysis proves that the non-polar c* axis in blocks coincides with the normal to the surface, and the polar axis b is oriented in the film plane. Temperature dependences of capacitance of GPI/NdGaO3 structures measured using interdigital structure of electrodes exhibit strong anomaly at ferroelectric phase transition temperature of glycine phosphite single crystals. Dielectric hysteresis loops in glycine phosphite films were measured by Sawyer-Tower method. The difference in frequency dependence of coercive field and remnant polarization in structures with GPI and previously studied betaine phosphite films is analyzed and attributed to considerable difference in dimensions of blocks in these structures.


Physics of the Solid State | 2009

Dielectric properties of betaine phosphite films

E. V. Balashova; B. B. Krichevtsov; V. V. Lemanov

Polycrystalline films of betaine phosphite are grown on single-crystal quartz and lithium niobate substrates atop interdigitated transducers. It is revealed using a light-polarizing microscope in the reflection mode that the films are made up of large (up to 1 mm in size) single-crystal blocks. The temperature dependences of the film capacitance measured at frequencies from 120 Hz to 1 MHz pass through a strong maximum at the ferroelectric phase transition point. The effect of a bias on the permittivity of the films is investigated. It is shown that the differences in the temperature dependences of the permittivity of single crystals and films originate from the influence of dynamic strains in the substrate on the film and from the presence of an effective depolarizing field.


Jetp Letters | 1997

Magnetization-odd nonreciprocal reflection of light from the magnetoelectric—ferromagnet LiFe5O8

V. N. Gridnev; B. B. Krichevtsov; V. V. Pavlov; R. V. Pisarev

Circular dichroism, which changes sign under magnetization reversal and exhibits a 120° periodicity, is observed in the reflection of light from the (111) plane of a noncentrosymmetric LiFe5O8 crystal in the transverse geometry k⊥M, where the linear Kerr effect is forbidden. It is shown that this phenomenon is due to the manifestation of optical magnetoelectric susceptibility and a Kerr effect of third order in the magnetization. The spectral dependences of the circular dichroism in the range 1.4–3.1 eV show that this phenomenon is of a resonance character.


Physics of the Solid State | 2013

Ferroelectric films of deuterated glycine phosphite: Structure and dielectric properties

E. V. Balashova; B. B. Krichevtsov; F. B. Svinarev; V. V. Lemanov

Polycrystalline textured films of deuterated glycine phosphite consisting of single-crystal blocks with lateral dimensions ∼(50–100) μm and a thickness d ∼ (1–5) μm have been grown by evaporation on NdGaO3(100) and α-Al2O3 substrates with preliminarily deposited interdigitated electrodes, as well as on Al substrates. The c* (Z) crystallographic axis in the blocks is normal to the film plane, and the a (X) axis and the polar axis b (Y) are oriented in the film plane. The temperature dependences of the capacitance of the structures measured with the interdigitated electrode system reveal a strong dielectric anomaly at the film transition to the ferroelectric state. The phase transition temperature Tc depends on the degree of deuteration D of the glycine phosphite. The maximum value Tc = 275 K obtained in the structures studied corresponds to a degree of deuteration of the glycine phosphite D ∼ 50%. The frequency behavior of the dielectric hysteresis loops in glycine phosphite films differs radically from that of the previously studied films of deuterated betaine phosphite, which evidences that polarization switching in these structures proceeds by different mechanisms. It has been that application of a dc bias to the electrodes changes the shape of the dielectric hysteresis loops and shifts them along the electric field axis. The shift of the loops depends on the sign, magnitude, and time of application of the bias. Possible mechanisms underlying the induced unipolarity are discussed.


Physics of the Solid State | 2010

Local field effects in magneto-optics of two-dimensional arrays of ferromagnetic nanoparticles

V. A. Kosobukin; B. B. Krichevtsov

A theory of the polar magneto-optical Kerr effect in a layer of small ferromagnetic particles has been developed in the framework of the Green’s function method of electrodynamics. The manifestation in magneto-optics of the local field effect, which is initiated by the contribution to the effective field of dipole moments induced in particles, has been studied in terms of the model of a square lattice of ferromagnetic ellipsoids. The magneto-optical Kerr effect stimulated under normal incidence of a linearly polarized electromagnetic wave on a layer of particles magnetized perpendicular to the layer plane has been analyzed. The dependence of the Kerr rotation angle in an array of ellipsoidal Co particles embedded in the transparent dielectric CaF2 on the light frequency, the parameters of the ellipsoidal particles, and the lattice period (concentration of the magnet in the layer) has been studied numerically. It has been shown that, within a broad (2.0–4.5 eV) spectral range, the local field effect studied as a function of increasing concentration of Co particles in the layer manifests itself in the reversal of the sign of the Kerr rotation compared to that observed in a single ellipsoid or a solid Co film.


Physics of the Solid State | 2011

Small- and strong-signal dielectric response in a single-crystal film of partially deuterated betaine phosphite

E. V. Balashova; B. B. Krichevtsov; V. V. Lemanov

Poly- and single-crystal films of betaine phosphite deuterated to ∼20% have been grown by evaporation on NdGaO3 (001) substrates with a preliminarily deposited planar interdigital structure of electrodes. The small-signal dielectric response in the 0.1–100.0-kHz frequency range has revealed a strong anomaly in capacitance upon the transition of the films to the ferroelectric state. Application of a bias field brings about suppression and a slight shift of the dielectric anomaly toward higher temperatures. The strong-signal dielectric response has been studied by the Sawyer-Tower method over the frequency range 0.06–3.00 kHz both in the para- and ferroelectric phases. In contrast to the case of a plane-parallel capacitor, in the planar structure studied, the dielectric hysteresis loops exhibit a very small coercivity at low frequencies, which grows with increasing frequency. This difference should be assigned to different domain structures formed in a planeparallel capacitor and in a planar structure in a saturating field. The growth of hysteresis with increasing frequency in a planar structure is considered to be associated with the domain wall motion.


Crystallography Reports | 2011

Dielectric properties of betaine phosphite and deuterated betaine phosphite films

E. V. Balashova; B. B. Krichevtsov; N. V. Zaitseva; G. A. Pankova; I. D. Frederiks; V. V. Lemanov

Polycrystalline films of betaine phosphite (BPI) and deuterated BPI have been grown by evaporation on LiNbO3, α-SiO2, α-Al2O3, and NdGaO3 substrates. These films consist of large single-crystal blocks in which the polar axis (b) lies in the substrate plane. The results of studying the dielectric properties of the films using interdigital electrodes, X-ray diffraction, and block images in a polarized-light microscope in reflection are reported. The film transition into the ferroelectric state at T = Tc is accompanied by strong anomalies of the capacitance of the film/interdigital structure/substrate structure. The deuteration of BPI films leads to an increase in their temperature Tc: from Tc = 200 K for BPI-based structures to Tc = 280 K for structures with a high degree of deuteration (d ∼ 90%).

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E. V. Balashova

Russian Academy of Sciences

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R. V. Pisarev

Russian Academy of Sciences

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V. V. Lemanov

Russian Academy of Sciences

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F. B. Svinarev

Russian Academy of Sciences

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G. A. Pankova

Russian Academy of Sciences

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V. V. Pavlov

Russian Academy of Sciences

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A. A. Rzhevskii

Russian Academy of Sciences

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N. V. Zaitseva

Russian Academy of Sciences

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E. I. Yurko

Russian Academy of Sciences

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V. N. Gridnev

Russian Academy of Sciences

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