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1
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The Magnetic Properties and the Barkhausen Noise of the Hydrogenated Fe-V-B Amorphous Alloy

100%
Ceniga L., Novák L.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 3
611-614
EN
As a consequence of the hydrogenation-dehydrogenation process, in the present paper the study of structural changes which could be followed by measuring structure sensitive magnetic properties as the stress induced anisotropy, the coercive force, the demagnetizing factor, and the Barkhausen noise parameters of the as-cast and hydrogenated Fe_{80}V_{5}B_{15} amorphous alloys is performed.
2
Content available remote

Rayleigh Region in Amorphous and Nanocrystaline FINEMET Alloy

100%
Novák L., Kováč J.
Acta Physica Polonica A
|
2014
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vol. 126
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issue 1
126-127
EN
The magnetization processes in region of small excitation magnetic fields - Rayleigh region, were investigated on the amorphous and nanocrystalline FINEMET ribbons. The significant differences in behaviour of these materials were found. This could be explained by the difference in the value of magnetoelastic anisotropy as well as by the different thickness of the domain walls in these materials.
3
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Influence of Pulse Heating on Rayleigh Area of Amorphous FINEMET-Type Alloy

81%
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.
4
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Study of the Magnetization Processes in Amorphous and Nanocrystalline FINEMET by the Numerical Decomposition of the Hysteresis Loops

81%
Kováč J., Novák L., Varga L.
Acta Physica Polonica A
|
2017
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vol. 131
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issue 4
732-734
EN
The magnetization processes in amorphous and nanocrystalline FINEMET ribbons were studied by the numerical decomposition of the quasi-static hysteresis loop to the contributions of the domain wall movement, the domain rotations, and the domain wall annihilation and nucleation processes following the hyperbolic T(x) model of hysteresis. The hysteresis data measured during decrease of the excitation magnetic field were used for the separation of these processes. The significant differences in behavior of these two materials were found. In amorphous state the domain rotations component dominates whereas in nanocrystalline state the domain wall movement component prevails. These differences are reflected in the anisotropy field distributions as well.
5
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Pulse Heat Treatment of FINEMET Alloys Under Tension

81%
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.
6
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The Magnetic Properties and the Barkhausen Noise of the Annealed Fe-V-B Amorphous Alloy

81%
Ceniga L., Novák L., Zentko A.
Acta Physica Polonica A
|
2000
|
vol. 97
|
issue 3
575-578
EN
As a consequence of the annealing process, the study of structural changes which can be followed by measuring structure sensitive magnetic properties as the stress induced anisotropy, the coercive force, the demagnetizing factor, and the Barkhausen noise parameters of the as-cast and annealed Fe_{80}V_{5}B_{15} amorphous alloys was performed. The structural changes were connected with the temperature range where the Fe_{80}V_{5}B_{15} amorphous alloy was characterized by the soft magnetic properties.
7
Content available remote

Evolution of Magnetic and Mechanical Properties in FINEMET-Type Precursor Glasses during Isothermal and Pulse Heat Treatments

81%
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.
8
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On the Mechanism of H-Induced Curie-Point Relaxation in Fe-Based Glassy Alloys

81%
Balla S., Kováč J., Novák L., Lovas A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
55-59
EN
In Fe based glasses not solely the stress-sensitive magnetic properties, but also the amorphous Curie temperature (T_C^{am}) can be altered by hydrogen absorption or due to the low temperature "heat treatments" in liquid N_2 (-196°C). The sign and magnitude of this T_C^{am} shift is strongly compositional dependent, but it is also influenced by the thermal history of glasses (heat treatments). In this paper new experimental results are presented, which were obtained on FeCrB alloys, supporting the previous observations. An attempt of interpretation of the results is also made, which is based on the existence of the quenched-in phase reminiscences, being inherited from the liquid structure.
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