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1
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Application of the Coupling Model to Magnetic After Effects in the Fe_{72}Co_{10}Nb_{6}B_{12} Amorphous Alloy

100%
Haneczok G., Kubik P., Madej Ł.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
396-398
EN
It was shown that magnetic reluctivity measured versus time after demagnetization for pre-annealed samples of the Fe_{72}Co_{10}Nb_6B_{12} amorphous alloy exhibits highly non-exponential behavior which can be described by the coupling model. The relaxation intensity and the coupling parameter describing correlation effects in free volume diffusion decrease with increasing 1 h annealing temperature indicating annealing out of free volume and formation of iron clusters in amorphous matrix.
2
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Influence of Cooling Rate on Magnetic Properties of (Fe_{80}Nb_{6}B_{14})_{1-x}Tb_{x} Type of Bulk Nanocrystalline Alloys

100%
Chrobak A., Ziółkowski G., Haneczok G.
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vol. 126
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issue 1
178-179
EN
The paper refers to magnetic properties of the (Fe_{80}Nb_{6}B_{14})_{1-x}Tb_{x} (x=0.06 and x=0.08) bulk nanocrystalline alloys prepared using the vacuum suction casting technique. The samples were in the form of rods with diameters of d=1.5 mm, 1 mm and 0.5 mm. It was shown that for the alloys with x=0.08 the significant magnetic hardening with the decrease of sample diameter was observed. For d=0.5 mm the coercive field equals 2.46 T and the maximum energy product |JH|_{max}=77.2 kJ/m^{3}.
3
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Magnetic properties of polymer matrix composites filled with ferrite powders

100%
Stabik J., Chrobak A., Haneczok G., Dybowska A.
Archives of Materials Science and Engineering
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2011
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vol. 48
4
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Optimization of Soft Magnetic Properties in Fe-B and Fe-B-Si Amorphous Alloys Obtained by Melt Spinning Method

88%
Kwapuliński P., Stokłosa Z., Chrobak A., Rasek J., Haneczok G.
Acta Physica Polonica A
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2002
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vol. 102
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issue 2
309-316
EN
In the present paper the process of optimization of soft magnetic properties have been studied by applying different experimental techniques (magnetic measurements, electric measurements, X-ray analysis, and high-resolution electron microscopy observations). It has been shown that an increase in magnetic permeability after optimization annealing can be mainly attributed to annealing out of microvoids.
5
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Magnetic Properties of Co-Fe-Si-B Microwires

88%
Kwapuliński P., Gieraltowski J., Dolabdjian C., Stokłosa Z., Haneczok G.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1256-1259
EN
In the paper the magneto-impedance effect in the Co_{68.15}Fe_{4.35}Si_{12.55}B_{15} microwire with diameter of about 100 μ m is carefully studied. The measurements in close contact and contactless geometry were carried out in the static field ranging from 0 to 6 kA/m and frequencies of the alternating field from 20 Hz to 2 MHz. It is shown that the examined microwire shows high anisotropy of soft magnetic properties i.e. the circumferential permeability is at least 7 times higher than the longitudinal one. Moreover, the microwire can be used as highly sensitive magneto-impedance sensor working in contactless geometry especially at fields below 200 A/m.
6
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Preparation and Magnetic Characteristics of Co_{1-δ}Zn_{δ}Fe₂O₄ Ferrite Nanopowders

88%
Kubisztal M., Herok I., Karolus M., Prusik K., Haneczok G.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1236-1239
EN
In the present paper the Co_{1-δ}Zn_{δ}Fe₂O₄ (0 ≤ δ ≤ 1) ferrite nanopowders with a spinel type structure were synthesized using a chemical co-precipitation technique with constant flow rate ν _{FR}=120 cm³/min at three different reaction temperatures i.e. T_r =50°C, 70°C and 90°C. Magnetic and structural characteristics of the obtained materials were investigated by means of X-ray diffraction method, transmission electron microscopy and vibrating sample magnetometer. In the course of studies hysteresis loops M(μ₀H) and the relations of magnetization M_{7T} (determined at μ_0H=7 T), squareness ratio S and the Néel temperature T_{N} versus Zn content were determined and discussed in detail. It was shown that for δ<0.6 the increase in reaction temperature T_r results in a significant increase of the measured magnetic characteristics. In particular, in the case of Co_{0.8}Zn_{0.2}Fe₂O₄ ferrite nanopowder magnetization M_{7T} reaches maximal value of about 80 emu/g.
7
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Structural Relaxation and Crystallisation in Fe-Cr-Si-B and Fe-Cu-Cr-Si-B Amorphous Alloys

88%
Stokłosa Z., Rasek J., Kwapuliński P., Haneczok G., Pająk L.
Acta Physica Polonica A
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2002
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vol. 102
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issue 2
273-281
EN
Structural relaxation, crystallisation and optimisation processes in soft magnetic amorphous alloys based on iron are examined by applying different experimental techniques: X-ray diffraction analysis, high-resolution electron microscopy, measurements of magnetic and electric properties (permeability, after-effect, resistivity). The presented results are discussed in terms of annealing out of microvoids, formation of a nanocrystalline phase and changes of effective magnetostriction constant.
8
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Influence of Transition and Rare Earth Elements on Magnetic Properties of Fe-Nb-B-M (M~=~Ni, Ag, Gd,~Tb) Bulk Nanocrystalline Alloys

76%
Ziółkowski G., Randrianantoandro N., Chrobak A., Klimontko J., Kądziołka-Gaweł M., Haneczok G.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1266-1269
EN
In this work we present magnetic properties of the (Fe_{80}Nb_6B_{14})_{1-x}M_x (where M = Ni, Ag, Gd, Tb and x = 0.08, 0.16, 0.32) bulk nanocrystalline alloys prepared by making use of mould casting technique. The applied preparation technique is favorable to nanocrystallization of the alloys with mean diameters of crystallites ranged from about 10 nm to 30 nm. Phase identification reveals a formation of ternary RE_2Fe_{14}B and binary REFe_2 phases dependently on the alloy composition. It was found that for the alloys with Ag addition magnetic moment of Fe atom increases from 2.26 μ_{B} to 3.36 μ_{B} for x = 0.08 and x = 0.32, respectively. For Ni addition this quantity decreases with increasing x due to appearing of Fe-Ni (fcc) phases. For Gd, Tb additions the alloys are ferrimagnetic with compensation composition ranged between x = 0.08 and x = 0.16. The both rare earth alloying additions cause a significant magnetic hardening especially in the case of Tb.
9
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Optimization of Soft Magnetic Properties in Fe₈₂Nb₂B₁₄RE₂ (RE = Y, Gd, Tb and Dy) Group of Amorphous Alloys

76%
Chrobak A., Haneczok G., Zivotsky O., Hendrych A., Kansy J., Kotur B.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
916-919
EN
Enhancement of soft magnetic properties in the selected group of amorphous alloys was examined by different experimental methods. It was shown that permeability for annealed samples (at T_{a} for 1 h; 300 K < T_{a} < 900 K) plotted vs. T_{a} shows a maximum at which is 700, 725, 725, and 750 K for Fe₈₂Nb₂B₁₄Y₂, Fe₈₂Nb₂B₁₄Gd₂, Fe₈₂Nb₂B₁₄Tb₂ and Fe₈₂Nb₂B₁₄Dy₂ alloy, respectively. For samples after the optimization annealing permeability is at least 10 times higher than in the as-quenched state. The optimized microstructure is free of iron nanograins and corresponds to so-called relaxed amorphous phase.
10
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Structural Relaxation in Fe_{78}Nb_{2}B_{20} Amorphous Alloy Studied by Mössbauer Spectroscopy

76%
Kansy J., Hanc A., Rasek J., Haneczok G., Pająk L., Stokłosa Z., Kwapuliński P.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
41-43
EN
It was shown that soft magnetic properties of Fe_{78}Nb_{2}B_{20} amorphous alloy can be significantly improved by applying 1-h annealing at temperature 623 K (permeability increases even about 8 times). The Mössbauer Spectroscopy technique indicated that the optimized microstructure (corresponding to the maximum magnetic permeability) is free of iron nanograins and should be attributed to annealing out of free volume and a reduction of internal stresses i.e. to the relaxed amorphous phase.
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