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1

The Study of Magnetization Process in Amorphous FeNiSiB Microwires

100%

Gamcova J., Varga R., Hernando B., Zhukov A.

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issue 5

807-808

EN

We have studied the magnetization process in amorphous Fe_{49.6}Ni_{27.9}Si_{7.5}B_{15} microwire. It was found that the hysteresis mechanism consists of two contributions: magnetoelastic and structural relaxation. It was shown that at low frequencies, the magnetization process is controlled mainly by the structural relaxation. At higher frequencies (above 50 Hz), the relaxation effect disappears and switching field is determined mainly by the magnetoelastic contribution. Moreover, the effect of thermal treatment at temperature 300°C has been studied. As-cast microwire is almost unsensible to the applied tensile stress since the applied stresses are lower than that induced during production. After annealing, the stresses relax and stress sensibility of microwires increases.

2

Effects of Heavy-Ions on Soft-Magnetic Metallic Glasses Studied by Diffraction of Synchrotron Radiation

88%

Michalik S., Pavlovic M., Gamcova J., Sovak P., Miglierini M.

Acta Physica Polonica A

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2017

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vol. 131

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issue 4

657-659

EN

In this work, influence of ²³⁸U swift (5.9 MeV/u) heavy ions on the as-prepared Fe-Cu-Nb-Si-B metallic glass was investigated by in situ temperature X-ray diffraction of synchrotron radiation. It was observed that ion irradiation strongly affected the temperature evolution of the parameters of the first diffuse peak. It is hypothesized that ion irradiation induced structural rearrangement that increased the degree of disorder of the amorphous structure. During heat treatment, structural relaxation and annealing out of this ion-induced degradation took place. Consequently, the original structure was recovered as demonstrated by the behaviour of the first diffuse peak broadening and devitrification process.

3

Susceptibility Spectroscopy in FeNiSiB Microwires

64%

Olivera J., Gamcova J., Varga R., Santos J., Prida V., Sanchez M., Hernando B., Zhukov A.

Acta Physica Polonica A

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2008

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vol. 113

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issue 1

155-158

EN

Here, we present the study on the influence of the Ni content on the magnetization processes of the amorphous glass-coated Fe_{77.5-x}Ni_xSi_{7.5}B_{15} (x = 0-40) microwires. Measurement of the amplitude dependence of the complex susceptibility was used to observe the magnetization process. It is shown that the magnetization process in the presented samples runs mainly through the domain wall motion.

4

Magnetic Characterization of Melt-Spun Co-Ni-Ga Ferromagnetic Superelastic Alloy

64%

Mino J., Ipatov M., Gamcova J., Saksl K., Durisin M., Zhukova V., Vargova Z., Zhukov A., Varga R.

Acta Physica Polonica A

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2017

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vol. 131

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issue 4

1075-1077

EN

Ribbons of composition Co₄₉Ni₂Ga₃₀ have been prepared by melt-spinning method. X-ray diffraction investigation revealed single phase with B2 structure at room temperature. However, analysis of magnetization dependence of temperature suggests phase transition in the range 150-250 K. Resistivity measurements revealed similar transition with shift to higher temperatures in the presence of magnetic field.

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The Study of Magnetization Process in Amorphous FeNiSiB Microwires

Effects of Heavy-Ions on Soft-Magnetic Metallic Glasses Studied by Diffraction of Synchrotron Radiation

Susceptibility Spectroscopy in FeNiSiB Microwires

Magnetic Characterization of Melt-Spun Co-Ni-Ga Ferromagnetic Superelastic Alloy