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1
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Magnetic Properties of Ferrofluid with Cobalt Ferrite Particles

100%
Didukh P., Ślawska-Waniewska A., Greneche J., Fannin P.
Acta Physica Polonica A
|
2000
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vol. 97
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issue 3
587-590
EN
Low temperature Mössbauer investigations of a diluted magnetic fluid containing ultrafine CoFe_{2}O_{4} particles are presented. The thermal evolution of cobalt ferrite particles from the magnetically ordered state to the superparamagnetic state with the blocking temperature at about 80 K, is shown.
2
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Surface Effects in Fe-Based Nanocrystalline Alloys

100%
Ślawska-Waniewska A., Brzózka K., Greneche J. M.
Acta Physica Polonica A
|
1997
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vol. 91
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issue 1
229-232
EN
The microstructural and Mossbauer investigations of FeZrBCu nanocrystalline alloy are presented. The results obtained indicate that fine bcc-Fe grains do possess identifiable surface properties which arise from the symmetry restriction at grain boundary.
3
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X-Ray Absorption Studies of Fe_{73.5}Cu_{1}Nb_{3}Si_{15.5}B_{7} Amorphous and Nanocrystalline Alloys

88%
Swilem Y., Sobczak E., Nietubyć R., Ślawska-Waniewska A., Dynowska E.
Acta Physica Polonica A
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1997
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vol. 91
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issue 5
883-886
EN
The nanocrystalline state of the formally amorphous alloy Fe_{73.5}Cu_{1}Nb_{3}Si_{15.5}B_{7} is achieved by a heat treatment at temperatures between 500°C and 600°C. The XANES and EXAFS methods were applied for investigation of local structure and chemical bonding around Fe atoms in amorphous and nanocrystalline alloys. The Fe K absorption spectra were measured in the transmission mode at room temperature for Fe_{73.5}Cu_{1}Nb_{3}Si_{15.5}B_{7} amorphous and nanocrystalline alloys and compared with the spectra for Fe metallic foil and Fe_{3}Si polycrystalline samples.
4
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Effect of Surfaces of FeNbCuBSiP Ribbons

76%
Butvin P., Butvinová B., Kuzminski M., Ślawska-Waniewska A., Sitek J., Maťko I., Kadlečíková M.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
152-153
EN
Boron was partially substituted by phosphorus (3 at.%) in two Si-poor Fe-Nb-Cu-B-Si Finemets. Mostly non-significant changes were observed after vacuum annealing at 500°C, whereas equivalent Ar annealing resulted in significantly better soft-magnetic properties, which suffer from compressive surfaces stress. Possibly by hampering surface crystallization, the substitution eased the surfaces stress and reduced undesired off-axis anisotrophy at the cost of limiting the useful annealing temperature.
5
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Magnetic and Structural Study of (ZnTe)/Co Core-Shell Nanowires Grown by Molecular Beam Epitaxy

64%
Misiuna P., Dłużewski P., Wojciechowski T., Lewińska S., Ślawska-Waniewska A., Wawro A., Wiater M., Wojtowicz T., Baczewski L.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
517-519
EN
Arrays of crystalline ZnTe nanowires grown by vapor-liquid-solid mechanism were covered with cobalt in a molecular beam epitaxy system. Magnetic and structural characterization of such core/shell nanowires was performed. Using scanning electron microscopy and transmission electron microscopy it was found that the mean shell thickness of cobalt was about 35% of the nominal deposition thickness. Deposited cobalt had a polycrystalline structure covering the ZnTe nanowires evenly along their length. With the increment of temperature during Co deposition the roughness of the nanowire sidewalls increases. Vibrating sample magnetometry measurements revealed that the magnetization easy-axis direction is perpendicular to the long axis of the nanowires, which is in agreement with theoretical predictions. Oxidation of Co shell does not change the anisotropy direction of such structures, however it increases their coercivity. Exchange bias effect at the interface of cobalt and cobalt oxides suggested by some authors is not responsible for such anisotropy orientation.
6
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The Influence of Annealing Temperature on Magnetic Properties of Vitrovac 6030

64%
Lachowicz H., Popławski F., Żuberek R., Kulik T., Ślawska-Waniewska A., Kuźmiński M., Yu S., Dynowska E.
Acta Physica Polonica A
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1999
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vol. 96
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issue 3-4
483-494
EN
Co-Fe-Mo-Mn-Si-B metallic glass ribbon (Vitrovac 6030) was subjected to the isothermal annealing at temperatures in the range 523-873 K so as to produce a series of samples with gradually coarser microstructure. For this series of samples a giant increase in the coercivity, exceeding three orders of magnitude, is observed. This increase is interpreted in terms of the strengthening of the pinning effect of the nanocrystalline structure on the moving domain walls. It is shown that the anisotropy of the created crystallites is mainly responsible for the increase in the pinning force since the effective anisotropy seen by the wall becomes larger and larger with the gradual increase in the density and size of the grown particles.
7
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Accents in Modern High Saturation Nanocrystalline Fe-Rich Alloys

64%
Butvinová B., Butvin P., Maťko I., Janičkovič D., Kuzminski M., Ślawska-Waniewska A., Švec P., Chromčíková M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
711-713
EN
Post processing limits for iron-rich Fe-Cu-Si-B-P high-induction rapidly-quenched ribbons have been tested. 530°C/20 min is already too much, formed borides being the essential culprit of magnetic properties deterioration. Unlike standard Si-poor Fe-Nb-Cu-B-Si Finemets, these alloys annealed even in "technical" Ar below the upper limit do not create significant squeezing surfaces.
8
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Content available

Structure and Magnetic Proporties of Polymer Matrix Nanocomposites

64%
Ławecka M., Leonowicz M., Kopcewicz M., Ślawska-Waniewska A., Kozubowski J., Dzhardimalieva G., Rosenberg A., Pomogailo A.
Acta Physica Polonica A
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2002
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vol. 102
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issue 2
317-321
EN
Structure and magnetic properties of the thermal decomposition products of Fe(III)Co(II) acrylate complex were analysed. The crystalline phases, which were found in the fully processed material, at 643 K, were Fe_3O_4, CoFe_2O_4, and CoO and had a mean particle size of about 30 nm. In the intermediate stages of the thermolysis iron was present in a form of Fe^{III} (trivalent low-spin iron), Fe^{2+} (divalent high-spin iron), and Fe_3O_4. The coercivity and remanence were measured versus temperature in the range of 5-300 K, in 1.1 T applied field. Both, _MH_c and M_r, decreased showing room temperature values of 0.038 T and 7.49 mT, for coercivity and remanence, respectively. At temperatures below 200 K the hysteresis loops were asymmetrical, opened and shifted towards negative field values.
9
Content available remote

Structural and Magnetic Properties of MBE Grown (Fe/Pt) (111) Multilayers

52%
Marynowska A., Dynowska E., Lewińska S., Seki T., Takanashi K., Kanak J., Pietruczik A., Aleszkiewicz P., Wawro A., Ślawska-Waniewska A., Baczewski L.
Acta Physica Polonica A
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2016
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vol. 130
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issue 6
1363-1370
EN
Series of Al₂O₃(0001)/Pt/(Fe/Pt)ₙ/Pt multilayers with variable number of bilayers n and thicknesses of individual layers were grown using molecular beam epitaxy to investigate influence of buffer layer structure, number of bilayers, and individual layer thickness on their structural and magnetic properties. Both columnar and monocrystalline 10 nm Pt (111) buffer layers were used in the experiment. Structure of Pt buffer layer determined the roughness of Fe/Pt interfaces and consequently magnetic properties of the multilayers. When multilayers were deposited on columnar Pt buffer layer, we observed increase of Fe/Pt interfaces roughness with increasing number of bilayers to values exceeding the nominal Fe/Pt bilayer thickness in the upper part of the sample volume, which resulted in the increment of coercivity in the sample with n=15 determined from hysteresis loops measured for perpendicular orientation of magnetic field. When Fe/Pt multilayers were deposited on monocrystalline Pt buffer layer, Fe/Pt interfaces were smooth regardless the number of bilayers. All samples, despite of the quality of buffer layer, number of bilayers, and individual layer thickness revealed easy magnetisation axis oriented in the sample plane.
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