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DC Magnetic Properties of Amorphous Vitrovac Ribbon

100%
Kollár P., Birčáková Z., Füzer J., Kuźmiński M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
675-677
EN
Soft magnetic amorphous Co-based materials prepared by rapid quenching method in the form of thin ribbon are well-known due to their excellent soft magnetic properties as high permeability, low coercivity, and low magnetic losses in kHz range. The amorphous Co-Fe-B-Si material Vitrovac® 6155 U55 produced by Vacuumschmelze GmbH & Co. KG belongs to this class of materials and was investigated in as-delivered state. The aim of this work was to study DC magnetization process by various experimental methods. We have measured magnetization curve by fluxmeter based hysteresis graph and hysteresis loops by three different fluxmeter based hysteresis graphs, exhibiting significant differences. The first and the second hysteresis graph perform the hysteresis loops measurement by the point-by-point method, either with commutative or with summing steps. The third one is AC hysteresis graph working at very low frequencies down to 7 mHz, performing the continuous method. The explanation of this result is based on the structural after effect influencing the domain wall displacement. We assumed that the domain structure consists of very small number of domain walls responsible for magnetization process, which was confirmed by the visualization of static domain structure by a computer-controlled setup based on the Kerr effect.
2
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Effect of Nanocrystallization Process on the Magnetomechanical Coupling in Fe-Si-B-Cu-Nb Alloy

100%
Kaczkowski Z., Małkiński L., Kuźmiński M., Müller M.
Acta Physica Polonica A
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1994
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vol. 85
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issue 1
201-204
EN
Magnetic and magnetoelastic properties of the Fe_{73.5}Si_{16.5}B_{6}Cu_{1}Nb_{3} alloy change considerably during nanocrystallization process. Improvement of magnetic properties is accompanied by the decrease in piezomagnetic parameters such as magnetomechanical coupling and ΔE-effect.
3
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Gradually Devitrified Co-Based Metallic Glass As a Model Material for Testing Néel's Theory of the Rayleigh Rule

88%
Lachowicz H., Popławski F., Kane S., Kuźmiński M., Kulik T.
Acta Physica Polonica A
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1999
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vol. 95
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issue 2
287-296
EN
It is shown in the present paper that gradually devitrified Co-based non-magnetostrictive metallic glass is an excellent model material to verify Louis Néel's theory of the Rayleigh rule. In the course of the calculations, Néel showed that the parameter p=bH_{c}a (where H_{c} is the coercivity, a and b are the coefficients of a quadratic polynomial expressing the Rayleigh rule) is expected to range between 0.6 (hard magnets) and 1.6 (soft). However, the experimental values of this parameter, reported in the literature for a number of mono- and poly-crystalline magnets, are much greater than those expected from the theory presented by Néel (in some cases even by two orders of magnitude). The measurements, performed for a series of Co-based metallic glass samples annealed at gradually increasing temperature to produce nanocrystalline structures with differentiated density and size of the crystallites, have shown that the calculated values of the parameter p fall within the range expected from Néel theory.
4
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The Influence of Annealing Temperature on Magnetic Properties of Vitrovac 6030

64%
Lachowicz H., Popławski F., Żuberek R., Kulik T., Ślawska-Waniewska A., Kuźmiński M., Yu S., Dynowska E.
Acta Physica Polonica A
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1999
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vol. 96
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issue 3-4
483-494
EN
Co-Fe-Mo-Mn-Si-B metallic glass ribbon (Vitrovac 6030) was subjected to the isothermal annealing at temperatures in the range 523-873 K so as to produce a series of samples with gradually coarser microstructure. For this series of samples a giant increase in the coercivity, exceeding three orders of magnitude, is observed. This increase is interpreted in terms of the strengthening of the pinning effect of the nanocrystalline structure on the moving domain walls. It is shown that the anisotropy of the created crystallites is mainly responsible for the increase in the pinning force since the effective anisotropy seen by the wall becomes larger and larger with the gradual increase in the density and size of the grown particles.
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