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1
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Stress-Induced Anisotropy and Stress Dependence of Saturation Magnetostriction in the Jiles-Atherton-Sablik Model of the Magnetoelastic Villari Effect

100%
Szewczyk R.
Archives of Metallurgy and Materials
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2016
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issue 2
2
Content available remote

Generalization of Magnetostatic Method of Moments for Thin Layers with Regular Rectangular Grids

100%
Szewczyk R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
845-847
EN
Possibilities of the modeling of the flux density distribution in thin films are significantly limited using the finite elements method due to the fast increase of the number of tetrahedral elementary cells with reduction of the thickness. For this reason, method of the moments is very important alternative for finite elements method in the case of thin layers, where layer's thickness should be considered. Method of the moments overcomes this barrier, due to the possibility of operation on uniform grids with limited number of cells. Moreover, in opposite to the finite elements method, the method of the moments requires solving of the well defined linear equations, instead of the set of ill-posed differential equations. Paper presents the generalization of the method of the moments for thin layers with given thickness. Layers are defined as the 2D rectangular grids. Within the generalization, four key equations describing the influence of rectangular cell's border on the magnetization of cells are stated. On the base of these dependences, the set of 2NM linear equations was determined, where N and M are the numbers of rectangular cells in the rows and columns of regular grid. Finally, the set of linear equations is solved and magnetic flux density distribution in the thin layer is calculated.
3
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Modelling of the Magnetic Characteristics of Isotropic and Anisotropic Materials for Sensor Applications

100%
Szewczyk R.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
67-70
EN
The following paper presents the results of modelling of the magnetic characteristics of isotropic (Ni-Zn ferrite) and anisotropic material (Fe_{40}Ni_{38}Mo_4B_{18} amorphous alloy in as quenched state), both useful for sensor applications. For the modelling an extended Jiles-Atherton model was used. Extension of the model connects model's parameter k, describing average energy required to break pinning site, with magnetic state of the material. Such extension of the model is reasonable from the physical point of view. Good agreement between experimental data and modelling confirms that the extended Jiles-Atherton model creates the possibility of modelling of magnetic characteristics of both isotropic and anisotropic magnetic cores.
4
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Magnetovision Scanning System for Detection of Dangerous Objects

64%
Nowicki M., Szewczyk R.
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vol. 126
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issue 1
382-383
EN
This paper presents an application of magnetovision based measurements to develop a method for passive detection of dangerous ferromagnetic objects. Scanning system was designed and built to study the magnetic field vector distributions. The measurements of the Earth's field disturbances caused by ferromagnetic objects were carried out. The ability for passive detection of selected dangerous objects was demonstrated. Further data processing allowed for determining the (x,y) coordinates of the object relative to the plane of measurement, and even the possibility of calculating the distance from the object. The results obtained indicate that it is possible to detect and determine the location of dangerous ferromagnetic objects. This opens the new way to use magnetovision in public security systems, in particular for the detection of dangerous objects by police and sapper robots.
5

Microbial degradation of pentachlorophenol

64%
Szewczyk R., Dlugonski J.
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2007
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issue 1
121-134
EN
Pentachlorophenol (PCP) is a toxic xenobiotic of great environmental concern. It has been widely used for many years as a bactericide, fungicide, defoliant, herbicide and wood preservative. In this article, PCP properties, microbial biodegradation and other approaches of this xenobiotic elimination from contaminated areas are reviewed.
6
Content available remote

Optimisation of Frame-Shaped Fluxgate Sensor Core made of Amorphous Alloy Using Generalized Magnetostatic Method of Moments

64%
Szewczyk R., Frydrych P.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
660-662
EN
Fluxgate magnetic field sensors are commonly used in the industry, navigation as well as in non-destructive testing. Moreover, recent development of such sensors is focused on effective application of thin layer magnetic cores, such as made of amorphous alloys. However, effective development of fluxgate sensors require method of modeling its core taking into account demagnetization. The paper presents the results of optimization of the shape of thin-layer core for fluxgate sensor. Due to the fact that possibility of application of finite elements method is limited in the case of thin layer, the method of moments was used. Considering the geometry of the core as well as magnetizing and sensing winding, the optimal proportion of the length/thickness parameter was determined from the point of view of sensor sensitivity. It was proven that value of this optimal proportion is strongly dependent of thickness of the core.
7
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High Resolution Eddy Current Tomography System for Nondestructive Testing

64%
Salach J., Szewczyk R.
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vol. 126
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issue 1
402-403
EN
Idea of the high-resolution eddy current tomography is presented. Proposed system gives possibility of testing cylinder-shaped elements made of both magnetic and non-magnetic materials. To validate the concept, the tomographic measurements are carried out on set of steel cylinders with non-magnetic copper inclusion. Measurements were done during both linear and rotational movement of the element. Achieved results indicate the high sensitivity of system, which creates possibility of its application for non-destructive testing of the elements made of ferromagnetic and non-magnetic materials.
8
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Extension of the Jiles-Atherton Model for Modelling the Frequency Dependence of Magnetic Characteristics of Amorphous Alloy Cores for Inductive Components of Electronic Devices

64%
Szewczyk R., Frydrych P.
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issue 5
782-784
EN
The paper presents the results of modelling the influence of magnetizing field frequency on the magnetic characteristics of Fe_{40}Ni_{38}Mo_4B_{18} amorphous alloy in as-quenched state. An extension for the Jiles-Atherton model was applied and changes of the parameter k during the magnetization process were considered. On the base of the experiment, the parameters of the Jiles-Atherton model were calculated for experimental hysteresis loop. Evolutionary strategies, together with the gradient optimisation method, were used. Moreover, the changes of parameters c and a as the function of frequency of magnetizing field were also taken into consideration. Finally, the high conformity between the experimental and modelling results was achieved. This high conformity indicates that the results both create new possibilities in modelling of properties of inductive components based on the amorphous alloys, as well as extend the possibility of quantitative description of magnetization process.
9
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Study on the Rayleigh Hysteresis Model and its Applicability in Modeling Magnetic Hysteresis Phenomenon in Ferromagnetic Materials

64%
Kachniarz M., Szewczyk R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1244-1249
EN
The following paper presents the basis of a Rayleigh magnetic hysteresis model and the examples of its application for modeling the magnetic characteristics of ferromagnetic materials: ferrites and steels. The presented model allows one to simulate the shape of a magnetic hysteresis loop of the material for the given value of the magnetizing field in the so-called Rayleigh region, as well as to calculate basic magnetic parameters of the material like coercive field, magnetic remanence, and power loss. Four different ferromagnetic materials (two ferrites and two alloy steels) were chosen for the investigation. Each material was investigated within the range of low magnetizing fields, corresponding to the Rayleigh region. On the basis of obtained results, modeling of magnetic characteristics of the investigated materials was performed. Moreover, the range of magnetizing field where the Rayleigh model can be applied for these materials was investigated based on correlation coefficient between experimental results and modeling.
10
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Open Source Implementation of Different Variants of Jiles-Atherton Model of Magnetic Hysteresis Loops

64%
Szewczyk R., Cheng P.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
654-656
EN
Jiles-Atherton model is one of the most advanced and most popular models of magnetic hysteresis loop. However, this model is considering different physical phenomena and computational issues. As a result, cross-validation of the results of modelling performed by different authors became difficult. For this reason, the open-source MATLAB/OCTAVE based implementation of Jiles-Atherton model was developed. Proposed implementation covers isotropic model of magnetic hysteresis loops as well as uniaxial and grain oriented electrical steel anisotropy. Moreover, the corrections proposed by Venkataraman together with different approaches to derivative of the anhysteretic magnetization are considered. Developed library is freely available together with the examples of magnetic hysteresis loops. As a result, it can be the base for further development of Jiles-Atherton model for better understanding of magnetization process as well as modelling the inductive components.
11
Content available remote

The Magnetoelastic Characteristics of Fe_{70}Ni_8Si_{10}B_{12} Amorphous Alloy Subjected to Thermo-Magnetic Treatment

52%
Bieńkowski A., Salach J., Szewczyk R., Kolano R.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
87-90
EN
This paper presents the experimental results of the magnetic and magnetoelastic investigation on the properties of Fe_{70}Ni_8Si_{10}B_{12} amorphous alloy, subjected to thermo-magnetic treatment. Samples were annealed at temperature 350°C for 1 hour, in parallel magnetic field (4 kA/m), as well as in transverse field (350 kA/m). Sample annealed without magnetic field was also tested. Magnetoelastic tests were performed under uniform compressive stress, applied to the ring-shaped core, perpendicularly to the direction of magnetizing field. The results indicated that the thermo-magnetic heat treatment changes the magnetic characteristics, but does not have a significant influence on the coarse of magnetoelastic characteristics of Fe_{70}Ni_8Si_{10}B_{12} amorphous alloy.
12
Content available remote

Application of Anisotropic Vector Preisach Model for Bulk Materials

52%
Frydrych P., Szewczyk R., Nowicki M., Charubin T.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
618-620
EN
In this paper possibility of application two-dimensional vector Preisach model for bulk materials was investigated. Physical magnetization mechanisms in bulk cores and thin ribbons were analyzed. Model is based on collection of the Preisach planes which describe material state in different angles on rotation plane. Presented model exhibits good conformity with experimental data for bulk as well for ribbon shaped cores. Model includes anisotropy and describes not only mean magnetization vector, but also distribution of magnetic moments for different angles.
13
Content available remote

Utilization of Electromagnetic Tomography for Ferrite Rings Testing

52%
Nowak P., Nowicki M., Gromada K., Szewczyk R.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
1045-1048
EN
Paper presents utilized innovative setup for eddy current tomography and possibility of its utilization in testing oxide materials such as ferrites. Previously reported tests concerned materials with high conductivity which is the most typical usage of eddy current tests. Described tomography setup is designed for testing axisymmetric objects thus typical ferrite ring was selected for exemplary testing. Tests were conducted on ring in original state. Afterwards reference defect was created on element and measurements were repeated. Significant difference between tests results were observed, thus potential for utilization in controlling of ferrite rings manufacturing process was confirmed. Finite element method simulations were applied in order to confirm the measurement results. Calculations were conducted in open-source finite element method software, which solves the Maxwell equations in the A-V form. Modelling results confirm possibility of finite element method-based inverse tomography transformation.
14
Content available remote

Modelling the Influence of Stresses on Magnetic Characteristics of the Elements of the Truss Using Extended Jiles-Atherton Model

52%
Jackiewicz D., Szewczyk R., Kachniarz M., Biedrzycki R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1189-1191
EN
Steel trusses structures are commonly used in civil engineering. Their mechanical parameters, especially the durability, are critical, and often human life depends on it. Therefore it is very important to monitor the critical elements of the truss. For this purpose magnetoelastic method of measurement may be used. It is a method having several advantages over other methods, particularly because of use of elements which are already parts of the structure. The study of structural elements have already been conducted. However, to take advantage of the magnetoelastic characteristics measurement to assess the state of stress, one should have a model of the influence of stress on magnetic properties. The influence of stresses on hysteresis loops was modelled with the extended Jiles-Atherton model. The obtained results of the modelling are consistent with the experimental measurements results. The results of modelling create new possibilities of explanation of the physical phenomena connected with magnetization of the magnetic materials under stresses, which is especially important for the assessment of the state of the constructional steel during its exploitation in industrial conditions.
15
Content available remote

Magnetic Fluxgate Sensor Characteristics Modeling Using Extended Preisach Model

52%
Frydrych P., Szewczyk R., Salach J.
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vol. 126
|
issue 1
18-19
EN
This paper presents the implementation of the extended Preisach model for fluxgate sensor characteristics modeling. The developed model enables the optimization of fluxgate sensor parameters for a given core material. Model consists of two parts. The first one describes magnetic characteristics of the core, while the second part calculates output signal according to sensor dimensions and electric circuit parameters. The model is easy to adapt for modeling of other devices with magnetic cores. It can be used instead of costly and time consuming prototype testing.
16
Content available remote

Utilization of Eddy Current Tomography in Automotive Industry

52%
Nowak P., Nowicki M., Juś A., Szewczyk R.
Acta Physica Polonica A
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2017
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vol. 131
|
issue 4
1168-1170
EN
Paper presents utilized innovative setup for eddy current tomography and possibility of its utilization in automotive industry. Described tomography setup is designed for testing axisymmetric objects thus motor valve was selected for exemplary testing. Tests were conducted on motor valve in original state. Afterwards reference defect was created on element and measurements were repeated. Significant difference between tests results were observed, thus potential for utilization in automotive industry was confirmed. Finite element method simulations were applied in order to confirm the measurement results. Calculations were conducted in open-source finite element method software, which solves Maxwell equations in the A-V form. Modelling results confirm possibility of finite element method-based inverse tomography transformation.
17
Content available remote

Isolated DC and AC Current Amplifier with Magnetic Field Sensor in Loop and Amorphous Ring Core

52%
Petruk O., Kachniarz M., Szewczyk R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1174-1176
EN
This paper presents innovative isolated DC and AC current amplifier containing magnetic field sensor in the feedback loop. The amorphous ring core with an air gap is utilized as a part of the galvanic isolation separating input and output currents. In the paper outline of the amplifier is presented. The printed circuit board project was developed and electronic circuit of the amplifier was manufactured. The developed device was investigated with DC and AC current and the results are presented in the paper. Results indicate usefulness of the developed device in described application.
18
Content available remote

Novel Method of Offset Voltage Minimization in Hall-Effect Sensor

52%
Petruk O., Kachniarz M., Szewczyk R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1177-1179
EN
The paper presents numerical model and validation of new methodology of offset voltage minimization in the Hall-effect sensors. Model of the Hall-effect sensor with multiple electric pins was developed. Mathematical equations used for calculation of electric potential difference were formulated. Simulations were carried out using finite elements method in ELMER FEM software. Performed investigation of actual parameters of newly designed Hall-effect sensor confirms effectiveness of the described method.
19
Content available remote

Implementation of Conductance Tomography in Detection of the Hall Sensors Inhomogeneity

52%
Petruk O., Nowak P., Szewczyk R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1186-1188
EN
Tomography is a useful tool for objects reconstruction in non-destructive testing. Many kinds of tomography, depending on the penetrating wave character, are available and adapted for specific application. This paper presents new kind of tomography - conductance tomography extended with a Hall effect. Its development was motivated by the need on inhomogeneity detection in thin film Hall effect sensor, particularly graphene Hall effect sensors. Paper presents complete description of the tomographic method and tomography software developed in the GNU Octave. Inverse transformation is based on optimization method. Each shape reconstruction was done with the finite element method using the open source software: Elmer FEM and Salome. Results confirmed the suitability of the work.
20
Content available remote

Magnetoelastic Properties of Hitperm-Type Alloys from Torque Moment

52%
Salach J., Bieńkowski A., Szewczyk R.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
115-118
EN
The following paper presents the results of the investigation on the influence of the torque on the magnetic characteristics of the Hitperm-type Fe_{41.5}Co_{41.5}Cu_1Nb_3B_{13} alloy, in as-quenched and nanocrystalline state. The methodology of application of the torque to the ring-shaped core is also described. This methodology gives a possibility of achieving uniform shearing stresses in the core. The results indicate that shearing stress sensitivity of Hitperm-type alloys depends on the annealing and nanocrystallization process. This effect should be considered during the development of magnetoelastic torque sensors.
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