Stanislav Volchkov

Stanislav Volchkov
Ural Federal University | UrFU · Department of Magnetism and Magnetic Nanomaterials

PhD

About

54
Publications
2,939
Reads
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405
Citations
Citations since 2016
31 Research Items
289 Citations
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
Additional affiliations
January 2005 - present
Ural Federal University
Position
  • Senior Researcher

Publications

Publications (54)
Article
Magnetic nanoparticles (MNPs) prepared as stable colloidal suspensions dispersed in water have attracted special interest for biological applications. MNPs of iron oxide synthesized by a laser target evaporation (LTE) technique are excellent candidates for biomedical purposes. Magnetic fluid flowing through the blood vessel creates magnetic fields...
Conference Paper
Magnetic nanoparticles were intensively studied in recent decades with the focus on biomedical applications. Often they are reaching the point of the therapy by the blood stream. They can be detected by the magnetic field sensor. However, experimental studies of such situations are limited by the ethical reasons and due to difficulties of different...
Article
Full-text available
Soft magnetic materials are widely requested in electronic and biomedical applications. Co-based amorphous ribbons are materials which combine high value of the magnetoimpedance effect (MI), high sensitivity with respect to the applied magnetic field, good corrosion stability in aggressive environments, and reasonably low price. Functional properti...
Conference Paper
The study of the magnetoimpedance effect (MI) in thin film multilayered structures was done by the finite element numerical simulation method (FEM). Longitudinal MI effect (external field and flowing current are parallel to each other) and transverse magnetic anisotropy were considered. The influence of saturation magnetization, anisotropy field, i...
Article
Full-text available
The static magnetic field was shown to affect the proliferation, adhesion and differentiation of various types of cells, making it a helpful tool for regenerative medicine, though the mechanism of its impact on cells is not completely understood. In this work, we have designed and tested a magnetic system consisting of an equidistant set of the sim...
Article
The paper presents the calculation results of the coplanar waveguide geometry using the method of conformal mapping and computerized simulation with COMSOL Multiphysics software. Ferromagnetic FeNi/Cu/FeNi magneto-sensitive elements are fabricated in one cycle with the coplanar waveguide which conveys drive signals. Magnetodynamics of the obtained...
Article
Full-text available
Amorphous and nanocrystalline materials are attractive systems for basic research and technological applications. In a view of the energy economy and global warming concepts there is a request to search for soft magnetic materials for sensor applications, which do not request additional heat treatments and can be produced in most simple technologic...
Article
Full-text available
Biomedical applications of magnetic materials are a hot topic of present day research. Special attention is paid for design and development of appropriate instrumentation. In this work magnetic system consisting of an equidistant set of commercial permanent magnets (6 × 4 assay) was proposed, designed and tested for further employment in the experi...
Article
Operation on the principle of the giant magnetoimpedace (GMI) magnetic field sensor was designed and tested for the case of CoFeSiB amorphous wire of 6 mm length. We considered magnetic field displacement of the order of 10 Oe. Piece of amorphous wire was placed as a central conductor of a coaxial cable. The maximum slope of the sensor GMI characte...
Article
Full-text available
Amorphous and nanocrystalline soft magnetic materials have attracted special attention in the area of sensor applications. In this work, the magnetoimpedance (MI) effect of patterned soft ferromagnetic meander-shaped sensor elements has been investigated. They were fabricated starting from the cobalt-based amorphous ribbon by lithography technique...
Article
The magnetic properties and specific features of giant magnetoimpedance in rapidquenched amorphous wires of composition (Co0.94 Fe0.06 )72.5Si12.5 B15 are investigated. The working interval and sensitivity to changes in an external quasistatic magnetic field have been calculated for the alternating current frequencies from 1 MHz to 1 GHz. Parameter...
Article
Rapidly quenched (Co <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.94</sub> Fe <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.06</sub> ) <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">72.5</sub> Si <su...
Article
A comparative analysis of the magnetic properties and specific features of the giant magnetoimpedance has been carried out for amorphous rapidly quenched wires with a composition of (Co0.94Fe0.06)72.5Si12.5B15 in the initial state and after the deposition of a carbon coating. The deposition of the defective graphene-like carbon layer was carried ou...
Article
Full-text available
Magnetic soft matter (ferrofluids or ferrogels) is one of the rapidly growing areas of research and applications including magnetic biosensing. Giant magnetoimpedance is the effect with proven capacity to magnetic label detection. In this work, we describe a universal model to simulate conditions of magnetic biodetection and to check its validity w...
Article
The increase in the number of materials for research and extending the list of their applications requires a parallel optimization of the methods of characterization. Microwave magnetoimpedance (MI) in low magnetic fields was proposed for the characterization of the axial magnetization process in different materials. Characterization of the same pa...
Article
Thin magnetic films and multilayers are widely used in electronic devices and sensor systems, including systems for magnetic nondestructive testing and magnetic biodetection. Creating sensing elements of a new generation will necessitate the certification of film nanostructures. In this paper, a novel system is presented that allows automated measu...
Article
Full-text available
Magnetoimpedance sensitive element that consists of one FeNi[125 nm]/Cu[3 nm])3FeNi[125 nm]/Cu[500 nm]/(FeNi[125 nm]/Cu[3 nm])3/FeNi[125 nm] multilayered structure was designed for the magnetic field detection in the wide range angular interval and its magnetoimpedance was measured experimentally. Double rectangle sensitive element with improved pe...
Article
Full-text available
Principles of measuring magnetoimpedance effect in samples that are intended for constructing electronic circuits that contain sensing elements for detecting weak magnetic fields, including stray fields, are described. Special attention is paid to those existent techniques of measuring magnetoimpedance effect in magnetic structures with distinctly...
Article
Full-text available
In recent years the number of magnetic sensors introduced into complex electronic devices rapidly increased due to the growing request for automatic systems. Giant magnetoimpedance (GMI) sensitive elements show very high sensitivity with respect to applied magnetic field and in wire geometry they can be obtained using massive and cheap technologies...
Article
The magnetic properties and, particularly the magnetoimpedance, MI, of short CuBe/CoFeNi electroplated microtube, 0.9 to 1.7 cm long, consisting of a CuBe metallic core surrounded by an electroplated ferromagnetic CoFeNi shell have been investigated with the final aim to be used as sensitive elements in sensor devices. From the analysis of the expe...
Article
Structure, magnetic properties, and magnetoimpedance (MI) of the nanocrystalline Fe73.5-xCrxSi13.5B9Nb3Cu1 (x = 0%, 1%, 2%, 3%, and 5%) ribbons produced by rapid quenching after thermal annealing at 520 °C for 2 h were investigated with the aim to produce materials with different functional possibilities. It was shown that increasing the Cr content...
Article
Full-text available
Magnetic properties and magnetoimpedance of [FeNi/Cu]n/FeNi/Cu(500 nm)/[FeNi/Cu]m/FeNi MI asymmetric and symmetric structures were studied for multilayeres with different thickness (25, 50 or 170 nm) of permalloy layers. The asymmetric structures in the case of FeNi layers of 50 nm show higher sensitivities comparing with symmetric structures. Asym...
Article
The magnetic impedance (MI) of film elements in the form of meanders with a [Fe19Ni81]/Cu]4/Fe19Ni81/Cu/[Fe19Ni81/Cu]4/Fe19Ni81 layered structure and variable geometry is studied. For the best meanders (having a maximal MI of up to 125% and an MI maximal sensitivity of about 30%/Oe), the influence of stray magnetic fields is determined. The stray f...
Article
A comparative analysis of the giant magnetoimpedance effect and the results of a mathe- matic simulation are presented. This simulation was used for optimizing the topology of a wide-angle magnetic transducer equipped with a sensitive element that consists of two crossed Fe3Co67Cr3Si15B12 amorphous ribbons that form different angles between them.
Article
The magnetization reversal and magnetic impedance (MI) of films and film elements based on Fe19Ni81 and Fe72.5Cu1.1Nb1.9Mo1.5Si14.2B8.7 alloys with a varied thickness, heat-treatment temperature, and the number of thin Cu interlayers are studied. The dependences of the coercive force and the magnitude of MI on these parameters are found. Layered st...
Article
The influence of a magnetic field or the mechanical stresses on the impedance of the Fe73.5Si16.5B6Nb3Cu1 and Fe73.5Si13.5B9Nb3Cu1 ribbons was investigated in the (297 divided by 433) K temperature range. It is shown that impedance changes, which are observed under the application of mechanical stresses and temperature, are conditioned by the struc...
Article
The role of the geometrical parameters was studied for thin film based [FeNi (100 nm)/Cu (3 nm)]4/FeNi (100 nm)/Cu (500 nm)/[FeNi (100 nm)/Cu (3 nm)]4/FeNi (100 nm) magnetoimpedance elements with open magnetic flux prepared by lithography technique. The maximum magnetoimpedance sensitivity of 17 %/Oe was obtained for meander shaped sample, exceedin...
Article
Full-text available
The magnetoimpedance effect is attractive for thin film-based magnetic sensor applications. Recently a significant progress has been made in the development of appropriate theories, preparation and characterization of MI thin film-based structures. In the present work multilayered structures with open magnetic flux have been prepared by rf-sputteri...
Article
The influence of the thermal treatment type on the temperature dependences of the magnetoimpedance of nanocrystalline Fe73.5Si16.5B6Nb3Cu1 alloy strips is investigated. The main mechanisms determining the temperature behavior of the magnetoimpedance of strips with induced magnetic anisotropy having various special features are established. The pros...
Article
The temperature dependences of the magnetic properties and the magnetoimpedance effect of soft magnetic nanocrystalline Fe73.5Si16.5B6Nb3Cu1 alloy ribbons are studied in the temperature range 24–160°C. A high temperature sensitivity of the impedance and the magnetoimpedance effect of the ribbons are detected in the ac frequency range 0.1–50 MHz. At...
Article
Full-text available
The magnetoimpedance (MI) in thin films and magnetic multilayers has been extensively studied in recent years. One of the important problems which is still under discussion is the temperature dependence of MI of the multilayered nanostructures for temperatures up to 200 oC. In this work magnetic properties and temperature dependence of the magnetoi...
Article
The structure and magnetic properties and the magnetoimpedance effect of nanocrystalline Fe73.5Si16.5B6Nb3Cu1 alloy ribbons, obtained from the amorphous state by annealing under different conditions, were comparatively analyzed. Despite the similarity of the samples’ structural states and the processes of their quasi-static magnetization reversal,...
Article
The performance of the magnetoimpedance effect in terms of magnitude and sensibility is evaluated for two FeNi/Cu/FeNi multilayer structures with different geometries, such that in one of them the magnetic layers are in contact at the edges, presenting a closed magnetic path that is absent in the other. Magnetization measurements by Kerr effect and...
Article
A magnetoimpedance (MI) sensor prototype with a sensitive element in the shape of an amorphous ribbon was designed and tested for recognition of metallic plates. The CoFeCrSiB ribbon sensitive element was prepared by a standard rapid quenching technique. Additional treatments were purposely not performed after the ribbon fabrication. Commercial iro...
Article
Magnetic properties, special features of magnetic anisotropy, magnetic domain structure, and huge magnetic impedance of permalloy/copper/permalloy film elements fabricated by the method of ion-plasma sputtering are investigated. Elements with different plane geometry of layers are analyzed. In the first case, all layers of the element have identica...
Article
Features of the magnetoimpedance effect of a sensitive element in the form of an amorphous ribbon of an Fe2.5Co64.5Cr3Si15B15 alloy were studied in the absence and presence of a ferromagnetic object in the form of a parallelepiped (0.65 × 3 × 25 mm) manufactured from high-carbon steel. Measurements of the magnetic-hysteresis loops and the values of...
Article
Full-text available
A comparative study of the magnetic properties and giant magnetic impedance of Fe19Ni81/Su/Fe19Ni81 film structures fabricated by the method of ion-plasma evaporation is performed versus the geometry of an impedance element. The geometrical parameters of the Fe19Ni81/Сu/Fe19Ni81 structures are estimated from the viewpoint of obtaining strong magnet...
Article
Full-text available
Experimental data on and model representations of the physical processes in small detectors operating on the basis of the magnetoimpedance effect are analyzed and generalized for conditions adapted to systems of magnetic nondestructive testing. The principles of measuring the high-frequency magnetoimpedance effect in electronic circuits including a...
Article
Partial devitrification of Co66Fe4Si16B12Mo2 amorphous ribbons leads to a magnetically hard-soft system that presents an anomalous magnetoimpedance (MI) effect as is reported in this work. The MI versus longitudinal dc magnetic field curves are asymmetrical, appearing horizontally shifted. The experiments prove that this shift can be tuned submitti...
Article
Full-text available
In this work magnetoimpedance (MI) behaviour was studied experimentally for Fe19Ni81(175 nm)/Cu(350 nm)/Fe19Ni 81(175 nm) sensitive elements deposited by rf-sputtering. A constant magnetic field was applied in plane of the sandwiches during deposition perpendicular to the Cu-lead in order to induce a magnetic anisotropy. Sandwiches with different w...
Article
Processes of magnetization and magnetic impedance (MI) effect have been investigated for the amorphous ribbons of the Fe3Co67Cr3Si15B12 alloy with various degrees of small plastic deformation (from 0 to 1%). The dependence of the total impedance and of the active and reactive resistances measured by using the probing current of frequency f = 10 MHz...
Article
Full-text available
Slight plastic deformation of 0 to 1% by cold rolling is proposed as a treatment which may modify the responses of magnetoimpedance (MI) sensor with an amorphous ribbon used as a sensitive element. The dependence of the magnetic properties of melt spun Fe3Co67Cr3Si15B12 amorphous ribbons and their MI responses in the initial state and after slight...

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