Impedance and magnetic properties of CoFeCrSiB amorphous ribbons near the curie point

The influence of temperature on the magnetic properties and magnetoimpedance of Co64Fe3Cr3Si15B15 and Co67FCr3Si15B12 amorphous ribbons having different Curie points are studied. The impedance and its component are found to change greatly when the ribbons pass into the paramagnetic state. This finding can be used to determine the Curie point of ferromagnets and design high-sensitivity thermal transducers. © 2013 Pleiades Publishing, Ltd

Nanostructuring effects in soft magnetic films and film elements with magnetic impedance

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 structuring is shown to be an effective method for improving the functional characteristics of MI elements. In elements containing nanocrystalline Fe19Ni81 layers, this is related to the restructuring of a magnetic structure; in elements containing amorphous Fe72. 5Cu1. 1Nb1. 9Mo1. 5Si14. 2B8. 7 layers, this improvement is likely to be caused by a decrease in the effective electrical resistivity. © 2013 Pleiades Publishing, Ltd

Magnetoimpedance and stress-impedance effects in amorphous CoFeSiB ribbons at elevated temperatures

The temperature dependencies of magnetoimpedance (MI) and stress impedance (SI) were analyzed both in the as-quenched soft magnetic Co68.5Fe4Si15B12.5 ribbons and after their heat treatment at 425 K for 8 h. It was found that MI shows weak changes under the influence of mechanical stresses in the temperature range of 295-325 K and SI does not exceed 10%. At higher temperatures, the MI changes significantly under the influence of mechanical stresses, and SI variations reach 30%. Changes in the magnetoelastic properties for the different temperatures were taken into consideration for the discussion of the observed MI and SI responses. The solutions for the problem of thermal stability of the magnetic sensors working on the principles of MI or SI were discussed taking into account the joint contributions of the temperature and the applied mechanical stresses. © 2020 by the authors.KK-2019/00101Funding: This work was supported in part by the Basque Country government under Elkartek program, grant KK-2019/00101

Mathematical model for the power supply system of an autonomous object with an AC power transmission over a cable rope

A modeling problem of the power system, which provides an AC power transmission to a submersible device over the conducting rope, was considered. The power supply system units and their parameters are described. The system multi-dimensional mathematical model in the variables state space with regard to the nonlinear characteristic of system elements is proposed

The power supply system model of the process submersible device with AC power transmission over the cable-rope

A practical problem of power supply system modeling for the process submersible device with AC power transmission over the cable-rope was considered. The problem is highly relevant in developing and operation of submersible centrifugal pumps and submersibles. The results of modeling a symmetrical three-phase power supply system and their compliance with the real data are given at the paper. The obtained results in the mathematical and simulation models were similar

Magnetoimpedance of CoFeCrSiB Ribbon-Based Sensitive Element with FeNi Covering: Experiment and Modeling

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 properties of ribbon-based sensitive elements can be modified by deposition of additional magnetic and non-ferromagnetic layers with required conductivity. Such layers can play different roles. In the case of magnetic biosensors for magnetic label detection, they can provide the best conditions for self-assembling processes in biological experiments. In this work, magnetic properties and MI effect were studied for the cases of rapidly quenched Co67Fe3Cr3Si15B12 amorphous ribbons and magnetic Fe20Ni80/Co67Fe3Cr3Si15B12/Fe20Ni80 composites obtained by deposition of Fe20Ni80 1 μm thick films onto both sides of the ribbons by magnetron sputtering technique. Their comparative analysis was used for finite element computer simulations of MI responses with different types of magnetic and conductive coatings. The obtained results can be useful for the design of MI sensor development, including MI biosensors for magnetic label detection. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.Funding: This research was funded by Ministry of Science and Higher Education of the Russian Federation, grant number FEUZ-2020-0051, Ministry of Science and Higher Education of the Russian Federation, grant number АААА-А19-119070890020-3, Act 211 Government of the Russian Federation, grant number 02. A03.21.0006

Temperature Dependence of Magnetoimpedance in FeNi/Cu/FeNi Film Structures with Different Geometries

Abstract. 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 Introduction The magnetoimpedance effect (MI) is a change of the complex impedance of a soft ferromagnetic conductor under application of an external magnetic field In this work, the magnetic properties and longitudinal MI were studied for the Fe 19 Ni 81 /Cu/Fe 19 Ni 81 multilayered elements with different geometries for a temperature range and frequency interval corresponding to the working areas for majority of the MI-based detectors