Andrei Turutin

National University of Science and Technology MISIS · Department of the Material Science of Semiconductors and Dielectrics

The study demonstrates that the dynamic characteristics of piezoelectric bimorph actuators based on bidomain lithium niobate (BLN) single crystals are accurately described by an analytical one-dimensional (1D) model of an ideal bimorph. Our observations show that displacements and an electric impedance of the BLN-based bimorphs can be predicted wit...

Magnetoelectric (ME) composites are extensively researched for their ability to detect magnetic field but are typically characterized by their interactions with homogeneous magnetic fields. However, practical applications often involve non-uniform magnetic fields (NMFs). In this study, we developed and validated a technique for 2D mapping of NMFs u...

Charged domain walls (CDWs) in ferroelectric materials raise both fundamental and practical interest due to their electrophysical properties differing from bulk ones. On a microstructure level, CDWs in ferroelectrics are 2D defects separating regions with different spontaneous polarization vector directions. Screening of electric field of the CDW's...

Silicon-carbon films are of great interest as diamond-like materials combining unique properties, e.g. high hardness, adhesion to a wide range of materials, abrasion resistance, chemical resistance, low friction coefficient and biocompatibility. The presence of silicon in the films significantly reduces their inner mechanical stress as compared to...

Charged domain walls (CDW) in ferroelectric materials are interesting from fundamental and applied points of view, since they have electrical properties different from bulk ones. At the microstructural level, CDW in ferroelectrics are two-dimensional defects that separate regions of the material with different directions of spontaneous polarization...

Silicon-carbon films are of great interest as diamond-like materials combining unique properties – high hardness, adhesion to a wide class of materials, abrasion resistance, as well as chemical resistance, low coefficient of friction and biocompatibility. The presence of silicon in the composition makes it possible to significantly reduce the inter...

Magnetoelectric (ME) composites can be useful due to their wide range of possible applications, especially as sensors of weak magnetic fields at room temperature for magnetocardiography and magnetoencephalography techniques in medical diagnostic equipment. In most works on the topic of ME composites, structures are tested in uniform magnetic fields...

Magnetoelectric (ME) composites have a wide range of possible applications, especially as room-temperature sensors of weak magnetic fields in magnetocardiography and magnetoencephalography medical diagnostic equipment. In most works on ME composites, structures are tested in uniform magnetic fields; however, for practical application, detailed know...

This paper investigates the possibilities of creating magnetic field sensors using the direct magnetoelectric (ME) effect in a monolithic heterostructure of amorphous ferromagnetic material/langatate. Layers of 1.5 µm-thick FeCoSiB amorphous ferromagnetic material were deposited on the surface of the langatate single crystal using magnetron sputter...

In this work the effect of annealing in a constant magnetic field on the magnetoelectric (ME) coefficient in three-layered gradient composites<LiNbO 3 /Ni/Metglas> is investigated. A technique of nickel electrochemical deposition on bidomain lithium niobate crystals was demonstrated. It is shown that the optimum temperature for the formation of the...

Non-contact mapping of magnetic fields produced by the human heart muscle requires the application of arrays of miniature and highly sensitive magnetic field sensors. In this article, we describe a MEMS technology of laminated magnetoelectric heterostructures comprising a thin pie-zoelectric lithium niobate single crystal and a film of magnetostric...

The effect of annealing in a permanent magnetic field on the magnitude of magnetoelectric coefficient in three-layered gradient magnetoelectric LiNbO 3 /Ni/Metglas composites has been studied. A method of electrochemical nickel deposition on bidomain lithium niobate crystals has been demonstrated. We show that the optimum annealing temperature in a...

This article deals with the effects of current modes on saccharin adsorption during NiFe electrodeposition, and, as a consequence, its effect on chemical composition, crystal structure, and microstructure of deposited films. For this purpose, we obtained NiFe films using direct, pulse, and pulse-reverse electrodeposition modes. The deposit composit...

In the present work, we investigated the effect of prolonged exposure on the electrical conductivity of crystals with a charged domain wall (CDW) in congruent lithium niobate crystals (LiNbO3, LN) of a nonpolar x-cut. Bidomain ferroelectric structures containing charged head-to-head domain boundaries were formed in the samples using methods of diff...

In this work, the effect of long-term room temperature exposure on the electrical conductivity of the charged domain wall (CDWs) in nonpolar x -cut congruent lithium niobate (LiNbO 3 , LN) crystals has been studied. Bidomain ferroelectric structures containing head-to-head charged domain boundaries have been produced by diffusion annealing in air n...

Lithium niobate is a ferroelectric material finding a wide range of applications in optical and acoustic engineering. Annealing of lithium niobate crystals in an oxygen-free environment leads to appearance of black coloration and concomitant increasing electrical conductivity due to chemical reduction. There are plenty of literary data on the elect...

Lithium niobate (LiNbO3) and lithium tantalate (LiTaO3) are among the most important and most widely used materials of coherent and nonlinear optics, as well as acoustics. The strict requirements on the uniformity and reproducibility of characteristics have become the base of the industrial technology for the production of high-quality crystals, ma...

Lithium niobate (LN) is a ferroelectric material with a wide range of applications in optics and acoustics. Annealing of LN crystals in an oxygen-free environment leads to the appearance of black coloration and the concomitant increase in electrical conductivity due to chemical reduction. The literature presents many works on the study of the elect...

High-quality and compact arrays of Ni nanowires with a high ratio (up to 700) were obtained by DC electrochemical deposition into porous anodic alumina membranes with a distance between pores equal to 105 nm. The nanowire arrays were examined using scanning electron microscopy, X-ray diffraction analysis and vibration magnetometry at 300 K and 4.2...

Polymer-based magnetoelectric composite materials have attracted a lot of attention due to their high potential in various types of applications as magnetic field sensors, energy harvesting, and biomedical devices. Current researches are focused on the increase in the efficiency of magnetoelectric transformation. In this work, a new strategy of arr...

Among many materials considered for use in domain-wall nanoelectronics, lithium niobate (LiNbO3, LN) is one of the most technological and physically stable. Compared with many other reports where inclined domain...

The article is devoted to the theoretical and experimental study of a magnetoelectric (ME) current sensor based on a gradient structure. It is known that the use of gradient structures in magnetostrictive-piezoelectric composites makes it possible to create a self-biased structure by replacing an external magnetic field with an internal one, which...

Cell Stretcher Based on Single-crystal Bimorph Piezoelectric Actuators - Ilya Kubasov, Aleksandr Kislyuk, Andrei Turutin, Andrei Shportenko, Aleksandr Temirov, Mikhail Malinkovich, Yuriy Parkhomenko

Use of Ferroelectric Single-crystal Bimorphs for Precise Positioning in Scanning Probe Microscope - Ilya Kubasov, Aleksandr Kislyuk, Andrei Turutin, Aleksandr Temirov, Sergey Ksenich, Mikhail Malinkovich, Yuriy Parkhomenko

Nanosized Field-effect Transistor Based on Germanium for Next Generation Biosensors in Scanning Ion-conductance Microscopy - Andrei Turutin, Aleksandr Temirov, Ilya Kubasov, Aleksandr Kislyuk, Mikhail Malinkovich, Yuriy Parkhomenko, Alexander Erofeev, Yuri Korchev

Diamond-like carbon (DLC) coatings offer versatile applications in surface engineering due to high hardness and strength, chemical and radiation resistance, biocompatibility and low friction coefficient. When doped with Si, such coatings demonstrate even more beneficial properties, such as lower friction coefficient and higher thermal stability. We...

Ниобат лития (LiNbO3) и танталат лития (LiTaO3) относятся к важнейшим и наиболее широко применяемым материалам когерентной и нелинейной оптики, а также акустики. Высокие требования, предъявляемые к однородности и воспроизводимости характеристик, стали основой промышленной технологии выпуска высококачественных кристаллов, освоенной многими предприят...

Ferroelectric materials based on lead zirconate titanate (PZT) are widely used as sensors and actuators because of their strong piezoelectric activity. However, their application is limited because of high processing temperature, brittleness, lack of conformal deposition and a limited possibility to be integrated with microelectromechanical systems...

Recent studies on piezoelectricity in 2D materials, such as graphene, have revealed their potential in multiple applications including microelectromechanical systems. In this work, we reveal piezoelectricity in few-layer graphene sheets deposited on amorphous Si3N4 membranes. The response in the center of square membrane of 6.7 × 6.7 mm2 size reach...

With the recent thriving of low-power electronic microdevices and sensors the development of components capable of scavenging environmental energy has become imperative. In this work we studied bidomain congruent LiNbO3 (LN) single crystals combined with magnetic materials for dual, mechanical and magnetic, energy harvesting applications. A simple...

The paper describes the magnetoelectric (ME) effect in a gradient laminate structure consisting of LiNbO3 / Ni / metglas multilayer based on a bidomain lithium niobite single crystal with a Y+128°‐cut. The main purpose of the work is to obtain a self‐biased structure. A theoretical and experimental study has been conducted to determine the optimal...

Ferroelectric lithium niobate (LiNbO 3 ) crystals with an engineered domain structure have a number of applications in optical systems for generation of multiple laser radiation harmonics, acoustooptics, precision actuators, vibration and magnetic field sensors, including those for high-temperature applications, and prospectively, in non-volatile c...

Low-frequency vibration energy harvesting is becoming increasingly important for environmentally friendly and biomedical applications in order to power various wearable and implanted devices. In this work, we propose the use of piezoelectric congruent LiNbO3 (LN) single crystals, with an engineered bidomain structure, as an alternative to the widel...

This study reports the creation of a highly sensitive, low-frequency magnetic field sensor based on a composite multiferroic consisting of a bidomain lithium niobate / metglas laminate shaped in form of a tuning fork. An efficient suppression of acoustic and thermal noises in the measurements of AC magnetic fields has been achieved. As a piezoelect...

We present a low-frequency sensor for the detection of vibrations, with a sub-nm amplitude, based on a cantilever made of a single-crystalline lithium niobate (LiNbO 3) plate, with a bidomain ferroelectric structure. The sensitivity of the sensor-to-sinusoidal vibrational excitations was measured in terms of displacement as well as of acceleration...

In the current study, we have developed a mathematical model describing the frequency response of a sensor or energy harvester based on a cantilever made of a ferroelectric bidomain single-crystal plate with metal electrodes deposited on opposite faces. The structure is subjected to vibrational excitations. The model allows to predict the dependenc...

We have analyzed phosphorus diffusion profiles in an In 0.01 Ga 0.99 As/In 0.56 Ga 0.44 P/Ge germanium structure during phosphorus co-diffusion with gallium for synthesis of the germanium subcell in multi-junction solar cells.. Phosphorus diffused from the In 0.56 Ga 0.44 P layer simultaneously with gallium diffusion into the heavily gallium doped...

We investigated the magnetoelectric properties of a new laminate composite material based on y-140deg.,-cut congruent lithium niobate piezoelectric plates with an antiparallel polarized “head-tohead” bidomain structure and metglas used as a magnetostrictive layer. A series of bidomain lithium niobate crystals were prepared by annealing under condit...

We present an investigation into the magnetic sensing performance of magnetoelectric bilayered metglas / bidomain LiNbO3 long thin bars operating in a cantilever or free vibrating regime and under quasi-static and low-frequency resonant conditions. Bidomain single crystals of Y+128o-cut LiNbO3 were engineered by an improved diffusion annealing tech...

The anisotropic direct magnetoelectric (ME) properties of bi-layered composites comprising magnetostrictive metglas foils and single-crystalline piezoelectric bidomain plates of 127ºY-cut LiNbO<sub>3<sub> (LNO) have been studied theoretically and experimentally. The LNO plates possessed an engineered ferroelectric macrobidomain structure with oppos...

Current relaxations in AlGaN/GaN high electron mobility transistors (HEMTs) often show a broad spread of relaxation times. These are commonly linked to the ionization energies of the traps in different regions of the devices and the relaxations are assumed to be exponential. To explain the observed spread of parameters, the presence of multiple cen...

Deep traps spectra are compared forGaN/InGaN light emitting diodeswith andwithout a template embeddedwith SiO2 nanoparticles underlying the active multiple quantum well region. The structures with SiO2 nanoparticles show a higher internal quantum efficiency which correlates with a lower concentration of deep traps with level near Ec-0.6 eV as compa...

Capacitance-voltage (C-V) and current-voltage (I-V) characteristics and deep trap spectra were measured for high-power HEMT structures grown by metallorganic chemical vapor deposition on semi-insulating 4H-SiC substrates and comprised of an AlGaN barrier and GaN(Fe) semi-insulating buffer with the upper (∼100 nm) portion unintentionally doped and l...

Deep traps were studied in multiple-finger AlGaN/GaN transistors with broad periphery by means of current–voltage and capacitance–voltage characteristics, reverse deep level transient spectroscopy, deep level transient spectroscopy with electrical (DLTS) and optical DLTS injection, and current DLTS (CDLTS) with gate voltage and drain voltage puls...

Deep traps spectra measurements were performed for a group of n-GaN films grown by metalorganic chemical vapor deposition (MOCVD) on sapphire using standard MOCVD and two versions of lateral overgrowth techniques, the epitaxial lateral overgrowth (ELOG) and pendeo epitaxy (PE). Deep levels transient spectroscopy with electrical (DLTS) or optical (O...

A wide variety of parameters were measured for undoped n-GaN grown by hydride vapor phase epitaxy and compared to n-GaN films grown by conventional and lateral overgrowth metalorganic chemical vapor deposition. The parameters included deep level electron and hole trap spectra, microcathodoluminescence, electron beam induced current, diffusion lengt...

For a group of n-GaN films grown by metalorganic chemical vapor deposition (MOCVD) using both straight MOCVD and epitaxial lateral overgrowth techniques (ELOG proper or pendeo overgrowth), the spectra of deep traps were measured by deep-level transient spectroscopy (DLTS) with electrical or optical injection (ODLTS). The results were compared with...

The results of experimental and theoretical researches of phosphorus distribution in the first cascade of a multi cascade solar cell based on nanoscale structures AIIIBV / Ge are presented. Secondary ion mass spectroscopy has been applied to obtain profiles of phosphorus and gallium in In0,01Ga0,99As / In0,56Ga0,44P / Ge heterostructure. In the ger...