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1
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Temperature Dependence of the Switching Field in Nanocrystalline FeNiMoB Microwires

100%
Klein P., Varga R., Vazquez M.
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vol. 126
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issue 1
64-65
EN
We have studied temperature dependencies of the switching field in as-cast and nanocrystalline glass-coated Fe_{40}Ni_{38}Mo_{4}B_{18} microwires. The switching field shows complex temperature dependence in the as-cast state reflecting the complex stress distribution induced during annealing. The temperature dependence of the switching field depends strongly on the stage of nanocrystallization being negative for low temperatures of annealing and positive for annealing at 700 K.
2
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Magnetic Properties of Glass-Coated FeWB Microwires

100%
Klein P., Varga R., El Kammouni R., Vazquez M.
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vol. 126
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issue 1
70-71
EN
We have studied magnetization process in amorphous bistable Fe_{80}W_{3}B_{17 } microwires with reduced Curie temperature. High mechanical stresses from glass-coating, induced during production process, result in high switching field. Reducing the length of microwire, the switching field decreases as a result of reduction of magnetoelastic anisotropy. Moreover, the decrease of magnetoelastic anisotropy results in a complex temperature dependence of the switching field. On the other hand, strong variations of the switching field with temperature can be employed in miniaturised temperature sensor.
3
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Temperature Dependence of Magnetization Process in Bistable Amorphous and Nanocrystalline FeCoMoB Microwires

100%
Klein P., Varga R., Vazquez M.
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issue 5
809-810
EN
We have studied the effect of thermal treatment on the magnetic properties of amorphous and nanocrystalline Fe_{40}Co_{38}Mo_4B_{18} microwires. The magnetization process was measured within the temperature interval from 80 to 425 K. Microwires shows complex temperature dependence of the switching field in amorphous state due to the presence of complex stress distribution induced during production. After nanocrystallization, the switching field depends linearly on the measuring temperature that makes such microwires ideal for sensing applications.
4
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Complex Magnetoimpedance in Joule-Heated Co_{71,1}Fe_{3,9}Si_{10}B_{15} Microwires

100%
Komova E., Kozar J., Klein P., Varga R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
705-707
EN
Complex magnetoimpedance study is an alternating current technique that can be used to probe some properties of magnetic materials. We report on complex impedance measurements in low-negative magnetostrictive ferromagnetic CoFeSiB microwire. In these wires, the domain structure consists of two parts: an inner core, with domains oriented to the longitudinal direction of the wire, and an outer shell with circumferentially oriented domains. This magnetic structure is modified by AC current flowing through the microwire which produces an additional circumferential magnetic field H_Φpand significantly affects magnetic structure inside the wires. The additional circular magnetization process in wires was studied by impedance measurements as a function of the amplitude and the frequency of the AC current after gradual Joule heating. Changes in the magnetization processes are reflected in the real permeability values and loss factor values.
5
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GMI Effect in Annealed Fe_{40}Ni_{38}Mo_{4}B_{18} Microwires

88%
Komova E., Šidik F., Klein P., Varga R., Vazquez M.
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vol. 126
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issue 1
74-75
EN
Amorphous glass-coated microwires are ideal material for miniaturized applications for sensing the temperature, stress and magnetic field. One of the key parameters for future applications is their time and thermal stability. It has been shown that stability can be improved by using nanocrystalline materials that combine good soft magnetic properties of amorphous matrix with high structural stability of crystalline grains. Such nanocrystalline materials are usually obtained by annealing of amorphous precursor. In the given contribution, the influence of dc current annealing on the domain structure and GMI effect in amorphous and nanocrystalline Fe_{40}Ni_{38}Mo_{4}B_{18} magnetic microwire has been studied. The annealing induces additional circular magnetic anisotropy, stress relief and structure homogenization. However, the increase of magnetostriction results in the decrease of GMI. Annealing at optimum crystallisation temperature results in an increase of the relative permeability due to the formation of the nanosized grains. Consequently, GMI amplitude is comparable to that of as-cast state.
6
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Effect of the Fixation Patterns on Magnetic Characteristics of Amorphous Glass-Coated Sensoric Microwires

76%
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
Content available remote

Effect of Current Annealing on Domain Structure in Amorphous and Nanocrystalline FeCoMoB Microwires

76%
Klein P., Varga R., Onufer J., Ziman J., Badini-Confalonieri G., Vazquez M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
681-683
EN
The influence of current annealing on the complex domain structure in amorphous and nanocrystalline FeCoMoB microwire has been studied. The thickness of radial domain structure together with the switching field of single domain wall change as a consequence of variation of complex internal stress distribution inside metallic core. Firstly, radial domain structure thickness monotonously increases with increasing annealing DC current density for amorphous state. Switching field exhibits local minimum in nanocrystalline sample annealed at 500 MA/m^2 for 10 min when the lowest thickness of outer shell (182 nm) was observed. Such annealed sample (which magnetic properties exhibit excellent temperature stability) is suitable candidate for miniaturized sensor construction for sensing the magnetic field or mechanical stress.
8
Content available remote

Novel Applications of Bistable Magnetic Microwires

52%
Sabol R., Klein P., Ryba T., Hvizdos L., Varga R., Rovnak M., Sulla I., Mudronova D., Galik J., Polacek I., Zivcak J., Hudak R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1150-1152
EN
Few examples of technical and biomedical applications of bistable magnetic microwires are shown. Particularly, application of microwires in civil engineering are shown for sensing the mechanical stress in concrete, steel structure or steel cable by simple gluing it on the surface of studied structure. On the other hand, biomedical applications for sensing the stress, temperature, and position inside the human or animal body are shown. Experiments with pig intestine cells points to the biocompatibility of glass coated microwires.
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