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1
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Investigations and Applications of Nanoperm-Type Soft Magnetic Materials

100%
Hasiak M., Łukiewski M., Miglierini M., Kaleta J.
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issue 5
829-831
EN
The microstructure and magnetic properties of Fe_{82}Zr_4Nb_3B_{10}Cu_1, Fe_{80}Zr_4Mn_3B_{12}Cu_1 and Fe_{80}Zr_4Ti_3Cu_1B_{12} alloys were investigated. Using RALE software the basic parameters of transformers made from nanocrystalline alloys with about 25% and 50% of crystalline phase were calculated. The transformer made from Fe_{80}Zr_4Ti_3Cu_1B_{12} alloys after annealing at 773 K for 1-shows the lowest core losses and highest efficiency.
2
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Active LR Integrator Circuit with Ferrite Core

100%
Gazda P., Nowicki M., Kachniarz M.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
1041-1044
EN
The paper presents the idea of active LR integrator circuit based on ferrite core. The LR topology, in contrast to contemporary RC, allow for drift-free operation of the integrator. Presented circuit is intended as main component of continuous operation fluxmeters and magnetoelastic transducers, especially working with low frequency signals. Critical component for proper frequency range and low signal distortion is the core material, which should allow for close-to-ideal inductance in the circuit. Presented simulation, measurement results, and total harmonic distortion analysis show that the proposed circuit works correctly.
3
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Study of Magnetic Micro-Ellipses by Cantilever Sensor

100%
Sečianska K., Šoltýs J., Cambel V.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
833-835
EN
In this paper, we propose a method for prototyping cantilever sensors by means of a modification of commercial atomic force microscopy cantilevers, using electron beam lithography and focused ion beam milling. To overcome obstacles with resist coating related to spin-coating of nonplanar 3D substrates, in this case of free-standing cantilevers, we propose a modified method based on spin-coating technique. An auxiliary atomic force microscopy chip was inserted below the cantilever to quasi-planarize the surface during spin-coating of electron beam resist. Magnetic micro-ellipses were prepared at the free-end of the cantilever by electron beam lithography. We propose a design of a cantilever sensor for the study of magnetic coupling between two cantilevers, prepared by focused ion beam milling. In ideal case, the coupling could be detected by a shift in resonance peaks. Attractive and repulsive forces between magnetic structures were shown by magnetic force microscopy.
4
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Thin Film Manganite-Metal Interconnection and "Loop Effect" Studies in CMR-Based High Magnetic Field Sensors

100%
Balevičius S., Stankevič V., Žurauskienė N., Šimkevičius Č., Liebfried O., Löffler M., Schneider M., Abrutis A., Plaušinaitienė V.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
1133-1135
EN
The design, technology and main characteristics of Ag contacts as well as "loop effect" peculiarities of colossal magnetoresistance B-scalar high magnetic field sensor based on La_{1-x}(Ca)Sr_x MnO_3 films used for measuring high magnetic field pulses are presented.
5
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Geometry Optimization of Pulsed Inductors

100%
Bartkevičius S., Novickij J., Višniakov N.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
1155-1157
EN
The optimization of pulsed power inductors' geometry is a difficult multi-dimensional task. On the one hand, an inductor could be destroyed because of the Joule overheating, on the other hand, it might be damaged by the Lorentz forces acting in its windings. The magnetic field pulse up to 50 T is the target while fields of this magnitude are the interest in many scientific applications. All factors mentioned are directly dependent on inductor's geometry, i.e. on the number of winding layers and windings per layer. Therefore, a detailed analysis of thermodynamic, electromagnetic and mechanical processes is inevitable and was carried out for different geometrical inductor configurations to reach the goal: a non-destructive inductor that can meet required magnetic field parameters. Direct calculation methods were used to create universal algorithms in MATLAB environment. The zone of inductor geometries, where stresses do not exceed the yield strength of materials, inductor is not overheated and generated magnetic field magnitude is in acceptable range, is given as a result which enables to manufacture new prototypes saving additional costs and time.
6
Content available remote

Effect of the Fixation Patterns on Magnetic Characteristics of Amorphous Glass-Coated Sensoric Microwires

100%
Hudak R., Varga R., Hudak J., Praslicka D., Blazek J., Polacek I., Klein P.
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vol. 126
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issue 1
417-418
EN
Some of the frequent reasons of titanium implant failures in human body are incorrect biomechanical interactions within the tissue-implant interface and inflammatory processes arising around the implant's application area. For both processes, it is crucial to locate them and intervene in time. One of the monitoring possibilities of the mentioned processes is the application of amorphous glass-coated sensoric microwires (AGCSM). Magnetic characteristics of these microwires are influenced by both mechanical tension (magnetoelastic interaction of the magnetic moment with mechanical stress) and by temperature (different coefficient of thermal expansion of the metal core and glass coating). The key task, in order to change the magnetic characteristics of AGCSM from both clinical and scanning point of view, appears to be the fixation pattern of AGCSM in the implant's body. The presented study shows the impact of four types of AGCSM fixation patterns (at one ending, at both endings, in the middle and along the entire length) on the thermal response process tested in laboratory conditions. The obtained results will enable to establish the AGCSM fixation methodology in the implant's body in order to achieve optimal output temperature parameters form the implant and the tissue-implant interface by magnetic contactless measurements.
7
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Minor Loops in the Harrison Model

100%
Chwastek K., Szczygłowski J., Wilczyński W.
Acta Physica Polonica A
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2012
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vol. 121
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issue 4
941-944
EN
A novel description of hysteresis phenomenon is presented. The examined description emphasizes the roles of bistability and quantum phenomena as processes responsible for hysteresis loop formation in magnetic materials. Major and symmetric minor hysteresis loops are modelled in chosen soft magnetic materials using the Harrison model. A reasonable agreement between theory and experiment is achieved.
8
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Content available

High Pulsed Magnetic Field Sensor Based on La-Ca-Mn-O Thin Polycrystalline Films

100%
Balevičius S., Žurauskienė N., Stankevič V., Keršulis S., Novickij J., Altgilbers L., Clarke F.
Acta Physica Polonica A
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2005
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vol. 107
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issue 1
207-210
EN
It is demonstrated that polycrystalline La_{0.33}Ca_{0.67}MnO_3 thin film sensors can be used to measure pulsed strong magnetic fields with microsecond duration rise and decay times. The response characteristics of these sensors were investigated using 0.7-1.0 ms duration bell-shaped magnetic field pulses of 10-20 T amplitudes and by using special waveform magnetic field pulses with amplitudes of 40 T and decay times of 50μs. The response of these magnetic field sensors was compared with those of conventional loop sensors and Faraday rotation sensors using Bi_{12}SiO_{20} single crystals as a known standard.
9
Content available remote

Layer and Interface Structure of CoFe/Ru Multilayers

75%
Pym A., Lamperti A., Cardoso S., Freitas P., Tanner B.
Acta Physica Polonica A
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2007
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vol. 112
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issue 6
1243-1248
EN
Grazing incidence X-ray scattering measurements have been performed to probe the structure of CoFe/Ru layers and their interfaces. It was found that the interface width increased approximately linearly with the layer number from the substrate in a multilayer and that a substantial asymmetry existed between the width of CoFe/Ru and Ru/CoFe interfaces. By co-minimizing both the specular and diffuse scatter with that simulated from a model structure, the topological roughness amplitude was determined to be comparable to the intermixing interface width.
10
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An Improvement of Magnetic Flux Linkage in Electrical Generator using the novel Permanent Magnet Arrangement

75%
Sriwannarat W., Khunkitti P., Janon A., Siritaratiwat A.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
642-644
EN
The partitioned stator permanent magnet generator (PS-PMG) has been extensively used as electrical generator due mainly to their high flux linkage, high electromotive force EMF) and high efficiency, especially the PM arrangement of the PS-PMG is an important factor to improve the performance of the generator. Therefore, we propose the novel permanent magnet PM) arrangement of the PS-PMG by using the dual rotor with coaxial core structure in order to improve the flux linkage and the EMF of PS-PMG. The PM position of stators of the conventional PS-PMG was rearranged, then the electrical characteristic of the proposed structure was characterized through the simulations based on finite element method. It was found that the flux linkage produced by the proposed structure is 37.06% higher than that of the conventional PS-PMG existed in the literatures because the area for induced flux linkage is significantly increased. This flux linkage enhancement further causes an increment of EMF about 34.95% compared to that of the conventional PS-PMG under the same condition. Especially, the EMF produced by the proposed structure is classified in the high-value range regarding the PM generator. Then, the PS-PMG using novel permanent magnet arrangement could be another remarkable choice for the electrical generator application
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