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1
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Influence of V and Cr Substitutions on Magnetic Properties of FeCoNbB Hitperms

100%
Butvinová B., Butvin P., Švec P., Vlasák G., Janičkovič D.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
111-114
EN
FeCoNbB Hitperm, where 4 at% of Fe are substituted by V or Cr show expected reduction of saturation, slightly lowered magnetostriction and slightly higher coercivity. Despite of significantly larger grain caused by Cr, the coercivity does not increase sharply. Detrimental ambient influences at non-vacuum annealing are not appreciably blocked by V or Cr.
2
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Effects of Intrinsic Forces in Toroidal Cores Wound of Soft-Magnetic Ribbons

100%
Butvinová B., Butvin P., Švec P., Chromčíková M., Vlasák G.
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issue 5
815-817
EN
Magnetic anisotropy as shown by hysteresis loops of tape-wound toroidal cores has been inspected as to the specific response of the anisotropy to core-internal forces during and after annealing. The loops of toroids are compared to that of strip samples annealed together in various ambience. The core-internal forces were manipulated by means of different core construction, too. The results show that it is the heterogeneity, which produces the most effective forces. Different annealing-induced ribbon shrinkage makes the cores effectively heterogeneous and governs their magnetic response, whereas inherent ribbon heterogeneity affects the core properties, too, and is essential for homogeneous cores.
3
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Effects of Core Dimensions and Manufacturing Procedure on Fluxgate Noise

100%
Janošek M., Vyhnánek J., Zikmund A., Butvin P., Butvinová B.
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vol. 126
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issue 1
104-105
EN
The effect of demagnetizing factor and manufacturing procedure on noise of the fluxgate probes, manufactured from metallic glasses, is presented. The fluxgate probes were either tape-wound, or flat, wet-etched ringcore and race-track geometries. When combining low demagnetizing factor and high enough cross-section of the probe, a minimum in the noise dependence can be found. For 50 mm ringcores, in such minimum the noise value as low as 7 pT_{RMS} in 0.1-10 Hz frequency band was achieved, which is very low for an as-cast tape, and has not been reported before.
4
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Effect of Surfaces of FeNbCuBSiP Ribbons

86%
Butvin P., Butvinová B., Kuzminski M., Ślawska-Waniewska A., Sitek J., Maťko I., Kadlečíková M.
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vol. 126
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issue 1
152-153
EN
Boron was partially substituted by phosphorus (3 at.%) in two Si-poor Fe-Nb-Cu-B-Si Finemets. Mostly non-significant changes were observed after vacuum annealing at 500°C, whereas equivalent Ar annealing resulted in significantly better soft-magnetic properties, which suffer from compressive surfaces stress. Possibly by hampering surface crystallization, the substitution eased the surfaces stress and reduced undesired off-axis anisotrophy at the cost of limiting the useful annealing temperature.
5
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Accents in Modern High Saturation Nanocrystalline Fe-Rich Alloys

73%
Butvinová B., Butvin P., Maťko I., Janičkovič D., Kuzminski M., Ślawska-Waniewska A., Švec P., Chromčíková M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
711-713
EN
Post processing limits for iron-rich Fe-Cu-Si-B-P high-induction rapidly-quenched ribbons have been tested. 530°C/20 min is already too much, formed borides being the essential culprit of magnetic properties deterioration. Unlike standard Si-poor Fe-Nb-Cu-B-Si Finemets, these alloys annealed even in "technical" Ar below the upper limit do not create significant squeezing surfaces.
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