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Influence of Pulse Heating on Rayleigh Area of Amorphous FINEMET-Type Alloy

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Novák L., Kováč J., Hubač L.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
753-755
EN
The effect of pulse annealing on magnetization processes in FINEMET-type alloy in weak magnetic fields (the Rayleigh area) is studied in this paper. Rapidly quenched FINEMET ribbon in the original amorphous state was chosen for the study. The significant differences in behavior of studied materials are ascribed to the differences in internal mechanical stresses, which bring about the changes in total magnetic anisotropy and consequently also changes in domain walls thickness.
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Pulse Heat Treatment of FINEMET Alloys Under Tension

100%
Lovas A., Hubač L., Novák L.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
100-101
EN
In this contribution a less common experimental procedure is presented, which includes simultaneous application of electrical pulse heating, and longitudinal mechanical stress, applied along the ribbon length, for the magnetic property tailoring. The annealing is performed in protecting atmosphere in a vertical tube furnace by applying a weight at the free, cold bottom end of the ribbon. In these circumstances neither nanometer-size grains nor the concentration-distribution have been developed. The static coercive force, anisotropy and demagnetizing factor are monitored as a function of pulse number.
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Evolution of Magnetic and Mechanical Properties in FINEMET-Type Precursor Glasses during Isothermal and Pulse Heat Treatments

100%
Hubač L., Novák L., Balla S., Lovas A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
672-674
EN
The effects on the evolution of coercivity (H_c) and brittleness in FINEMET-type precursor glasses during traditional (isothermal) and pulse heat treatments are compared. The time and temperature dependences of these quantities are monitored during the series of isothermal and pulse heat treatments. The activation energy for H_c relaxation is lower than that for the brittleness evolution, however, dramatic changes in the values of these quantities can be detected above 300°C. Both quantities change mainly with temperature, they are less time-dependent.
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