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1
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Magnetostriction Measurements of (Fe-Co)-Mo-Cu-B Alloys with Varying Atomic Fe/Co Ratio

100%
Vlasák G., Janičkovič D., Švec P.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
107-110
EN
Amorphous rapidly quenched ribbons of (Fe-Co)_{76}Mo_8Cu_1B_{15} with the ratio Co/Fe = 0, 1/9, 1/6, 1/4, 1/3, 1/2, 1/1 and 2/1 were prepared by planar flow casting. The dependence of the Curie temperature T_C on Co/Fe ratio was determined. Due to the presence of the invar effect it was possible to measure the spontaneous volume magnetostriction in the temperature interval between 300 K and T_C. Field dependences of magnetostriction in parallel and perpendicular directions of applied magnetic field were obtained by direct measurement method. Subsequently, saturation magnetostriction and volume magnetostriction as well as forced magnetostriction were computed. Saturation magnetostriction increases with increasing Co/Fe ratio from 0 up to 17 ppm, depending both on the Co/Fe ratio and on the shift of T_C with composition. The alloy with ratio Co/Fe = 0 exhibits T_C near room temperature, thus field dependences of magnetostriction, corresponding to the dependences of a paramagnetic system are practically linear functions of applied field, corresponding to paramagnetic state.
2
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Structure and Properties of Soft-Magnetic Amorphous Bilayer Ribbons

89%
Švec P., Mat'ko I., Marcin J., Kováč J., Vlasák G., Janičkovič D., Škorvánek I., Švec P.
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issue 5
832-834
EN
Rapidly quenched bilayers consisting of Fe-Si-B and Co-Si-B layers have been prepared by planar flow casting from a single crucible with two nozzles. Temperature dependences of electrical resistivity, dilatation and magnetization have been investigated in the amorphous state and during crystallization of both layers. Preliminary studies of the structure of the layers and of the interlayer have been performed by X-ray diffraction, cross-sectional electron microscopy and microanalysis. From the results it seems evident that the process of connection of the two layers during preparation takes place by solidification with only a small extent of mutual interdiffusion of component atoms localized to a narrow well-defined interface, leading to mechanically solid connection between the two layers. The effect of combined presence of two different soft magnetic alloys on the overall magnetic properties is discussed with respect to potential applications of such materials.
3
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Effect of Temperature on Magnetization Processes in Amorphous Rapidly Solidified FeSiB/CoSiB Bilayer Ribbons

89%
Capik M., Švec P., Marcin J., Kováč J., Sopko M., Janičkovič D., Švec P., Škorvánek I.
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vol. 126
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issue 1
120-121
EN
Amorphous bilayers consisting of Fe-Si-B and Co-Si-B layers have been prepared by planar flow casting from a single crucible using a double-nozzle technique. Temperature dependencies of magnetization and hysteresis loops have been investigated in a wide temperature range. At room temperature, the effects of interlayer stresses, induced in material due to different thermal expansion coefficients of two mechanically interconnected soft magnetic layers, resulted in rounded hysteresis loops with flattened central part, indicating a dominant role of magnetization rotational processes. With an increase of measurement temperature, the interlayer stresses are relieved and the hysteresis loops became more squared.
4
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Influence of Cobalt Substitution on Hyperfine Interactions in (Fe_{1-x}Co_x)_{76}Mo_8Cu_1B_{15} Alloys

88%
Kaňčuch T., Miglierini M., Lancok A., Švec P., Illeková E.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
63-66
EN
The effect of cobalt substitution on structure, magnetic behaviour, magnetic arrangement, and hyperfine interactions in (Fe_{1-x}Co_x)_{76}Mo_8Cu_1B_{15} (x = 0, 0.1, 0.2, 0.25, 0.5) is studied by the Mössbauer spectrometry for both as-quenched and annealed alloys. Partial substitution of Fe by Co resulted in an enhancement of the average value of hyperfine magnetic field distributions as a function of x probably due to higher magnetic moment of Co. After annealing, a two-phase nanocrystalline structure composed of amorphous matrix and bcc-FeCo nanocrystallites was observed. Mössbauer spectra were fitted with up to four six-line patterns of narrow lines assigned to different number of Co nearest neighbours inside a bcc-FeCo lattice.
5
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Influence of V and Cr Substitutions on Magnetic Properties of FeCoNbB Hitperms

88%
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.
6
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Effects of Intrinsic Forces in Toroidal Cores Wound of Soft-Magnetic Ribbons

88%
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.
7
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Magnetoimpedance Effect in Field Annealed (FeNi)_{78}Nb_{7}B_{15} Amorphous and Nanocrystalline Bilayer Ribbons

76%
Varga M., Marcin J., Capik M., Janičkovič D., Švec P., Škorvánek I.
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vol. 126
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issue 1
122-123
EN
The influence of the magnetic field annealing on the magnetoimpedance effect has been investigated in rapidly quenched (Fe_{0.5}Ni_{0.5})_{78}Nb_{7}B_{15} monolayer and bilayer thin ribbons. The highest impedance ratio value (ΔZ/Z)_{max}=72% and the maximum field sensitivity η_{max}=12 %/Oe was obtained in the bilayer ribbon, annealed under longitudinal magnetic field at 773 K that exhibited nanocrystalline structure. The higher values of (ΔZ/Z)_{max} in bilayer ribbons, as compared to their monolayer counterparts, are attributed to the increased ratio of their thickness to the penetration depth.
8
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Influence of Co Doping on Induced Anisotropy and Domain Structure in Magnetic Field Annealed (Fe_{1-x}Co_x)₇₉Mo₈Cu₁B₁₂

76%
Kunca B., Marcin J., Švec P., Kováč J., Švec Sr. P., Škorvánek I.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
759-761
EN
The effect of heat treatment in applied magnetic field on the induced anisotropy and domain structure of (Fe_{1-x}Co_x)₇₉Mo₈Cu₁B₁₂ (x=0, 0.2, 0.5) nanocrystalline alloy system was investigated. A heat treatment of Co-doped samples under the application of longitudinal magnetic field resulted in squared hysteresis loops characterized by very low coercive field values. Sheared loops with tunable slope and good field linearity were obtained after annealing in transverse magnetic field. Corresponding domain structure showed uniform character, oriented in the direction parallel or perpendicular to the ribbon axis after longitudinal or transverse magnetic field annealing, respectively. No effect of magnetic field annealing was found in Co-free sample. Correlations between Co-doping, the Curie temperature, and soft magnetic properties after magnetic field annealing are discussed.
9
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Influence of Thermomagnetic Treatment on Magnetoelastic Properties of FeNiMoB Amorphous Alloy

64%
Szewczyk R., Svec P., Salach J., Švec P., Bieńkowski A., Hoško J., Jackiewicz D., Kamiński M., Winiarski W.
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vol. 126
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issue 1
52-53
EN
Paper presents the results of magnetoelastic tests of ring-shaped cores made of Fe_{40}Ni_{38}Mo_{4}B_{18} amorphous alloy. The cores were subjected to thermomagnetic annealing under different values of magnetic field. The obtained results enabled us to connect the magnetoelastic characteristics of Fe_{40}Ni_{38}Mo_{4}B_{18} amorphous alloy with the conditions of thermomagnetic treatment of the material.
10
Content available remote

Ellipsometric Selective Sensitivity to Magnetic Nanostructures

64%
Hamrlová J., Postava K., Životský O., Hrabovský D., Pištora J., Švec P., Janičkovič D., Maziewski A.
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issue 5
837-839
EN
Recently, we have shown that the approach of depth sensitivity of magneto-optic ellipsometry can be generalized to selectivity from different materials in nanostructures. We use the condition number as the figure of merit to quantify the magneto-optic selectivity to two different magnetic contributions in magnetic nanostructure. The method is demonstrated on nanostructures containing magnetically hard Fe particles in surface layer of soft FeNbB amorphous ribbon. We separated both magnetic contributions from measurement of hysteresis loops using magneto-optic Kerr effect in longitudinal configuration. Magneto-optic selectivity is discussed and theoretical model on the basis of effective medium is compared with experimental data of longitudinal magneto-optic Kerr effect depending on angle of incidence.
11
Content available remote

Accents in Modern High Saturation Nanocrystalline Fe-Rich Alloys

64%
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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