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1
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Magnetic Properties of the Rapidly Solidified Bulk Alloy: Fe_{61}Co_{10}B_{20}Y_{8-x}W_{y}Pt_{x} (where: x=1,2; y=0,1)

100%
Pietrusiewicz P.
Acta Physica Polonica A
|
2018
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vol. 133
|
issue 3
666-668
EN
In the literature, research into rapidly cooled Pt-based alloys usually features samples that are produced in the form of thin ribbons. This work presents the effect of the addition of a small quantity of W and Pt on the magnetic properties of massive two-phase alloys, the samples being produced in the form of plates with a thickness of 0.5 mm. Both amorphous and crystalline phases were observed in the alloys, the phase proportions depending on the composition of the alloy. Generally, it is assumed that alloys with added Pt are characterised by a relatively high saturation magnetization and magnetocrystalline anisotropy, which is mainly influenced by the presence of the crystalline phases: FePt and Fe₃Pt. For the investigated alloys, it was noted that the gradual substitution of W and Pt in place of Y within the alloy Fe₆₁Co₁₀B₂₀Y_{8-x}W_{y}Pt_{x} increased the value of saturation magnetization (μ₀M_{s}) and reduced the coercive field (H_{c}). On the basis of XRD pattern analysis it was found that, within the sample with the highest concentration of Pt, there are crystallites of the smallest size and the proportion of the α-Fe crystalline phase is much greater than for the other studied samples.
2
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Microstructure and Magnetic Properties of the Classical Amorphous Alloys: Fe₆₁Co₁₀Y₈Me₁B₂₀ (where Me = W, Mo)

64%
Pietrusiewicz P., Nabiałek M.
Acta Physica Polonica A
|
2016
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vol. 130
|
issue 4
920-922
EN
A study has been conducted into the effects of substituting small quantities of alloying elements (tungsten and molybdenum) on the structure and magnetic properties of classical amorphous alloys that are based on the formula: Fe₆₁Co₁₀Y₈Me₁B₂₀. The structure of the resulting alloy samples was examined using X-ray diffraction, Mössbauer spectroscopy, and scanning electron microscopy. Based on the results of these studies, it was found that the obtained alloys were amorphous. Images from the scanning electron microscope were typical for amorphous materials. Cross-sectional images were homogeneous and did not contain "vein- and scale-type" precipitations. Studies examining the magnetic properties of the samples were carried out using a vibrating sample magnetometer. It was found that the alloy featuring the addition of tungsten exhibited a significantly greater saturation of magnetization and a substantially lower coercivity. This resulted from the fact that the atomic radius of tungsten is much larger than that of molybdenum, resulting in increased difference between the atomic constituents of the alloy; This, in turn, improves the glass-forming ability.
3
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Analysis of the Thermal and Magnetic Properties of Amorphous Ribbons of Fe₆₁Co₁₀B₂₀Y₈Me₁ (where Me = W, Zr, Nb, Mo)

64%
Pietrusiewicz P., Nabiałek M.
Acta Physica Polonica A
|
2017
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vol. 131
|
issue 4
678-680
EN
This paper presents the results pertaining to thermal and magnetic studies of rapidly-cooled samples of the alloy family Fe₆₁Co₁₀B₂₀Y₈Me₁ (where Me = Nb, Zr, W, Mo). The resulting ribbons, or tapes, have amorphous structure. It has been found that the addition of Me elements alters the thermal and magnetic properties. It is noted that the saturation magnetization decreases with increasing number of unpaired electrons on the valence shells. In addition, the value of the coercivity and effective anisotropy have been determined.
4
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Influence of 1% Addition of Nb and W on the Relaxation Process in Classical Fe-Based Amorphous Alloys

51%
Pietrusiewicz P., Błoch K., Nabiałek M., Walters S.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 2
397-399
EN
This paper features investigations into the influence of small additions of alloying elements on: structure, as well as the temporal and thermal stability of magnetic properties, and the disaccommodation effect, for the following amorphous alloys: Fe₆₁Co₁₀Y₈Me₁B₂₀ (where Me = Nb, W). The structure of the investigated samples has been confirmed by the Mössbauer spectroscopy. The obtained results indicate a strong correlation between the structure and the disaccommodation of the studied alloys. The Mössbauer studies reveal different configurations of atoms in the amorphous alloy samples, and the results indicate various potential barriers between orientations of atom pairs. For this reason, to describe the disaccommodation effect, the distribution of activation energy should be taken into account. The distribution of activation energy has been related to the distribution of relaxation times.
5
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Microstructure and Soft Magnetic Properties of Fe61Co10Y8Me1B20 (Where Me = W, Zr or Nb) Amorphous Alloys

51%
Pietrusiewicz P., Nabiałek M., Szota M., Perduta K.
Archives of Metallurgy and Materials
|
2012
|
issue 1
6
Content available remote

Influence of Low Temperature Annealing on the Magnetic and Structural Properties of Fe_{61}Co_{10}Y_{8}W_{1}B_{20} Alloy

45%
Pietrusiewicz P., Nabiałek M., Szota M., Dośpiał M., Gruszka K.
Acta Physica Polonica A
|
2014
|
vol. 126
|
issue 1
110-111
EN
In alloy materials, the onset of crystallization temperature (T_{x}) is treated as the threshold of structural stability. In amorphous materials, this threshold is the temperature above which heterogeneous crystalline grains begin to appear. However, in amorphous materials, frozen nuclei of the crystalline grains also come into existence during the production process. These nuclei have a strong influence on the properties of the amorphous materials. The growth of the nuclei of the crystalline grains is possible even below the crystallization temperature, and maintaining control over their size allows the application properties, for example the magnetic properties, to be controlled. In this paper, the influence of two-stage isothermal annealing (below the crystallization temperature) on the structure and magnetic properties of Fe_{61}Co_{10}Y_{8}W_{1}B_{20} alloy was investigated. Samples of the material were prepared in the form of plates, and subjected to thermal treatment at temperatures of 700 K and 770 K, for 1 and 3.5 hours, respectively.
7
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Investigation of the Magnetization Reversal Process of High-Remanent Nd_{10}Fe_{83}Zr_1B_6 Alloy in the As-Cast State

45%
Ceglarek A., Płusa D., Dośpiał M., Nabiałek M., Pietrusiewicz P.
Acta Physica Polonica A
|
2012
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vol. 121
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issue 5-6
1279-1281
EN
In this work the magnetic properties of ribbons with composition of Nd_{10}Fe_{83}Zr_1B_6 obtained by using the melt-spinning method were studied. From the X-ray diffraction patterns the phase composition was determined. It was found that investigated alloy was composed of α-Fe and Nd_2Fe_{14}B phases. From the peaks broadening the grain sizes of α-Fe and Nd_2Fe_{14}B phases were estimated as equal to 20 nm and 40 nm, respectively. From the recoil curves the reversible μ_0 M_{rev} and irreversible μ_0 M_{irr} parts of magnetization and differential susceptibility χ_{rev} and χ_{irr} were determined as a function of an applied field. From these dependences it was found that the pinning of domain walls at the grain boundaries is the main magnetization reversal process. The interactions between grains were investigated by means of the δ M plot. It was stated that short range exchange interaction between grains of hard and soft phases are dominant and causes the remanence enhancement.
8
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Influence of Annealing on the Microstructure and Magnetic Properties in Amorphous Alloys

39%
Dośpiał M., Pietrusiewicz P., Nabiałek M., Szota M., Błoch K., Gondro J., Gruszka K.
Archives of Metallurgy and Materials
|
2014
|
issue 2
9
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The Structural Relaxation and its Influence on High Field Magnetization Processes

39%
Dośpiał M., Pietrusiewicz P., Nabiałek M., Szota M., Błoch K., Bukowska A., Gruszka K.
Archives of Metallurgy and Materials
|
2014
|
issue 2
10
Content available remote

Magnetic Relaxations in Amorphous Fe_{61}Co_{10}Y_{8}Zr_{1}B_{20} Alloy

39%
Pietrusiewicz P., Błoch K., Gondro J., Nabiałek M., Dośpiał M., Szota M.
Acta Physica Polonica A
|
2014
|
vol. 126
|
issue 1
106-107
EN
Effects of annealing on the disaccommodation phenomenon in bulk metallic glasses (BMGs), obtained by injection-casting method have been studied. The amorphous structure has been confirmed using X-ray diffractometer. The annealing process has been performed at temperature below the crystallization temperature. For all investigated samples the disaccommodation curves have been determined. The susceptibility and its disaccommodation have been used in order to define thermal and time stability of magnetic properties. Obtained results have also been used to determine activation energies of elementary processes.
11
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Effect of Cooling Rate on Magnetic Properties, Size and Type of Structural Defects in the Volume of Bulk Amorphous Fe36Co36B19Si5Nn4 Alloy in the Form of Rods of Various Diameters

39%
Nabiałek M., Dobrzańska-Danikiewicz A., Lesz S., Pietrusiewicz P., Szota M., Dośpiał M.
Archives of Metallurgy and Materials
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2014
|
issue 1
12
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Modeling the Hysteresis Loop in Hard Magnetic Materials Using T(x) Model

39%
Dośpiał M., Nabiałek M., Szota M., Pietrusiewicz P., Gruszka K., Błoch K.
Acta Physica Polonica A
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2014
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vol. 126
|
issue 1
170-171
EN
Possibility of decomposing the static hysteresis loop is demonstrated. The applied method is related with decomposition of experimentally obtained reversal magnetization curve on the reversible and irreversible components. Results are applicable in analysis of reversal magnetization processes in hard magnetic materials and for simulation of hysteresis loop using hyperbolic T(x) model.
13
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The Investigation of the Magnetization Reversal Mechanism in the Nd-Fe-B Type Magnet, Aligned by Hot Deformation

39%
Dośpiał M., Nabiałek M., Szota M., Lipiec W., Nizhankovskii V., Ceglarek A., Pietrusiewicz P.
Acta Physica Polonica A
|
2012
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vol. 121
|
issue 5-6
1282-1284
EN
The magnetization reversal mechanism in the Nd_{16}Fe_{78}B_6 hot densified magnet, aligned by means of die-upset forging has been investigated. The magnetic parameters have been derived from major hysteresis loop. The magnetocrystalline anisotropy constants K_1 and K_2 using Sucksmith-Thompson relation modified by Ram and Gaunt have been calculated from the high field measurements up to 5 T. These data have been used to determine the theoretical value of coercivity as a function of the angle Ψ_0 between the sample easy axis and the applied magnetic field direction. The experimental value of coercivity as a function of Ψ_0 has been determined from the demagnetization curves measured for different Ψ_0 angles. It was found that the best correlation between theoretical and experimental data have been achieved for magnetization reversal mechanism controlled partially by pinning of domain walls on grain boundaries and nucleation processes.
14
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Time and Thermal Stability of Magnetic Properties in Fe_{61}Co_{10}Y_{8}Nb_{1}B_{20} Bulk Amorphous Alloys

39%
Błoch K., Nabiałek M., Pietrusiewicz P., Gondro J., Dośpiał M., Szota M., Gruszka K.
Acta Physica Polonica A
|
2014
|
vol. 126
|
issue 1
108-109
EN
The paper presents studies of time and thermal stability of magnetic properties in Fe_{61}Co_{10}Y_{8}Nb_{1}B_{20} bulk amorphous alloys. The investigated sample was prepared by suction-casting method in the form of plate. The structure was studied using X-ray diffractometry. It was found that alloy was amorphous in the as-cast state. The magnetic properties were determined using completely automated set up for measurement of susceptibility and its disaccommodation. The disaccommodation curve was decomposed into three elementary processes, each of them was described by Gaussian distribution of relaxation times. From fit of theoretical curve the peak temperature, intensity at peak temperature, average activation energies, distribution parameter and pre-exponential factor of the Arrhenius law were determined. The obtained results indicate that the disaccommodation phenomenon in studied samples is related with directional ordering of atom pairs near the free volumes.
15
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Evaluation of the Microstructure and Magnetic Properties of Fe73Me5Y3B19 (Where Me = Ti or Nb) Amorphous Alloys

39%
Nabiałek M., Lesz S., Dośpiał M., Pietrusiewicz P., Szota M., Jędryka J., Szota K.
Archives of Metallurgy and Materials
|
2012
|
issue 1
16
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The Structural Stability of the Fe36Co36Si19B5Nb4 Bulk Amorphous Alloy

33%
Nabiałek M., Pietrusiewicz P., Szota M., Dobrzańska-Danikiewicz A., Lesz S., Dośpiał M., Błoch K., Oźga K.
Archives of Metallurgy and Materials
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2014
|
issue 1
17
Content available remote

Influence of the Production Method on Magnetization Processes of the Fe_{61}Co_{10}Y_{8}Mo_{1}B_{20} Bulk Amorphous Alloys

33%
Nabiałek M., Dobrzańska-Danikiewicz A., Pietrusiewicz P., Stradomski Z., Dośpiał M., Szota M., Gondro J., Lesz S.
Acta Physica Polonica A
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2014
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vol. 126
|
issue 1
112-113
EN
The aim of this paper was to show the influence of the manufacturing method of bulk amorphous alloys on the resulting magnetization processes. Samples in the form of plates were prepared by the injection or suction of liquid alloy into a copper mould. In order to determine the type and quantity of structural defects present in the bulk amorphous alloys, the indirect method, i.e. the approach to the ferromagnetic saturation, was applied. Studies revealed the presence of conglomerates of point defects, for both alloys. These defects were pinning sites of domain walls and their number, size and type was found to have a direct impact on the coercive field. Alloy produced by the suction-casting method was found to possess the highest number of these defects, and thus a higher coercive field value.
18
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Analysis of the Thermal and Magnetic Properties of Amorphous Fe61Co10Zr2.5Hf2.5Me2W2B20 (Where Me = Mo, Nb, Ni Or Y) Ribbons

27%
Dośpiał M., Gruszka K., Mizera J., Nabiałek M., Szota M., Bloch K., Gondro J., Pietrusiewicz P., Sandu A. V., Mustafa Al Bakri A. M., Walters S., Walters K., Garus S.
Archives of Metallurgy and Materials
|
2016
|
issue 2
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