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Study of Axial Dimension of Static Head-to-Head Domain Boundary in Amorphous Glass-Coated Microwire

100%
Kladivová M., Ziman J., Kecer J., Duranka P.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
639-641
EN
A new experiment allowing the study of static domain boundary dimensions in bistable microwire is proposed. In this experiment a static domain boundary is created by an inhomogeneous axial magnetic field. The changes in axial magnetic flux due to the presence of this boundary were measured along the microwire using two pick-up coils. Experimental results were compared with a simple theoretical model. For Fe_{77.5}Si_{7.5}B_{15} microwire with total diameter of 30 μm and metal nucleus diameter of 15 μm, good agreement between theoretical and experimental data was obtained for an axial dimension of the static domain boundary about 200 times larger than the diameter of the wire metallic core.
2
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Stress-Induced Changes in Closure Domain Structure Dynamics in Bistable Ferromagnetic Microwire

100%
Onufer J., Ziman J., Kladivová M.
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vol. 126
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issue 1
80-81
EN
A new experimental method for the study of closure domain structure dynamics in bistable ferromagnetic microwires is proposed. The simple experimental set-up enables detection of the presence of a free domain wall in the wire after application of a well-defined rectangular magnetic field pulse. The changes in closure domain structure dynamics, caused by applied tensile stress, are demonstrated by measurements on Fe_{77.5}B_{15}Si_{7.5} glass-coated microwire. Minimum critical field for the release of a domain wall from the closure domain structure increases with increasing stress, while on the other hand, the minimum time needed for this process rapidly decreases with increasing stress.
3
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Single Domain Wall Contribution to the Impedance of Amorphous Ferromagnetic Wire

100%
Ziman J., Šuhajová V., Kladivová M.
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vol. 126
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issue 1
82-83
EN
An experiment, measuring the changes of impedance in a magnetic wire, caused by the presence of a single domain wall was proposed. The results obtained from a magnetic wire with small helical anisotropy show that for lower frequencies (up to about 1 MHz), the presence of wall causes an increase in impedance, very probably due to the wall displacement. As frequency increases, the influence of the wall presence on the magnetic state causes the impedance to decrease in adjacent domains. For frequencies close to 10 MHz this effect overcomes the effect of wall displacement.
4
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The Influence of Temperature on Unidirectional Effect in Domain Wall Propagation

100%
Onufer J., Ziman J., Rezničák M., Kardoš S.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
723-725
EN
It has been reported recently that domain wall mobility in Fe-based amorphous glass-coated microwire can be significantly different in the cases when magnetization reversal caused by domain wall motion results in different orientation of magnetization. This behaviour has been called unidirectional effect. The effect of temperature on domain wall velocity vs. axial magnetic field dependences was studied for glass-coated Fe_{77.5}Si_{7.5}B_{15} microwire samples with strong unidirectional effect. Unidirectional effect was observed for the whole temperature interval from 100 K up to room temperature. Analysis of the results obtained indicates that the model of a solid domain wall does not explain the observed v(H) dependences. It seems very probable that besides standard damping mechanisms also changes in structure (shape) of the domain wall as a function of velocity (magnetic field) should be considered. Understanding of this mechanism could also provide interpretation of unidirectional effect.
5
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Domain Wall Dynamics in Amorphous Ferromagnetic Wire with Small Helical Anisotropy

100%
Ziman J., Kladivová M., Onufer J., Zagyi B.
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issue 5
778-779
EN
Dynamics of the domain wall between circular magnetic domains in amorphous ferromagnetic Co_{68.2}Fe_{4.3}Si_{12.5}B_{15} wire was studied in a small region around the domain wall equilibrium position in an inhomogeneous magnetic field. The wire was prepared using the in-rotating-water-quenching technique. Small helical anisotropy was induced in the wire by current annealing and simultaneous application of tensile stress and torsion. The inhomogeneous magnetic field acted on domain wall by restoring force directly proportional to the displacement of the domain wall from its equilibrium position. Domain wall position was monitored by circular magnetic flux measurements from which it results that domain wall motion can be modeled by the motion of a very strongly damped pendulum. The value of domain wall mobility obtained from these experiments is in good agreement with the values calculated and measured for domain wall driven by a constant magnetic field.
6
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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.
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