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1
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Magnetic Properties of Thin Films of Fe-Cu-R-Si-B Alloys with R = Nd, Gd, Ho, Y

100%
Gościańska I., Ratajczak H., Urbaniak M., Konč M.
Acta Physica Polonica A
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1997
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vol. 91
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issue 1
237-240
EN
Hysteresis loops of thin films of Fe_{73.5}Cu_{1}R_{3}Si_{13.5}B_{9} (R = Nd, Gd, Ho, Y) alloys were studied by the magnetooptical Faraday method. The films were deposited by flash evaporation technique onto cooled glass substrates. Lanthanides were chosen as substitutes for niobium in the FINEMET type alloys. Coercivity, H_{c}, was determined from the easy- and hard-axis hysteresis loops. The as-deposited films containing Gd and Ho are characterized by rather low values of H_{c} while the films with Nd and Y show a high isotropic value of H_{c}. Attempts were made to determine the conditions of the film annealing which would ensure the optimum soft magnetic properties of the films studied.
2
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Influence of Annealing Treatment on the Structure and Magnetic Properties of Fe-Al-Cu-Nb-Si-B Alloys

88%
Pavlík G., Matta P., Sovák P., Zorkovská A., Konč M.
Acta Physica Polonica A
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2000
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vol. 97
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issue 5
741-744
EN
In this paper we present experimental results on influence of Al content on the structure and saturation magnetostriction of Fe-Al-Cu-Nb-Si-B alloys after heat treatment. Transmission electron microscopy observations confirmed the existence of nanocrystalline structure after annealing at 490°C and 550°C for all samples. The crystallization temperature of FeSi phase and the temperature at which the polycrystalline transformation starts were determined from temperature dependence of electrical resistivity. Aluminium slightly decreases the first crystallization temperature and considerably decreases the saturation magnetostriction in as-quenched state.
3
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Influence of Thickness and Magnetic Field on Magnetic Ordering Temperatures in Holmium Thin Films

76%
Dudáv J., Guzan M., Gabáni S., Kavečanský V., Gošciańska I., Vincze A., Konč M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
191-195
EN
Influence of thickness and magnetic field on magnetic ordering temperatures is reported. The X-ray diffraction of Ho films confirmed their preferential crystal orientation and revealed diffraction peaks originating from the hcp structure of Ho and those from inessential holmium dihydride content. Secondary ion mass spectroscopy showed a very homogeneous distribution of holmium in thin films. Electrical resistance measurements on Ho films in the thickness range from 98 nm to 215 nm showed a "knee-like" resistance anomaly near the T_N. The T_N value of these films decreased with decreasing film thickness. Magnetic field applied parallel to the thin film plane caused an increasing suppression of the T_N value up to 5 K with increasing flux density value up to 5 T.
4
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Failure Behaviour of Fe- and Co-Based Amorphous Soft Magnetic Ribbons

76%
Miškuf J., Csach K., Juríková A., Janák G., Švec T., Konč M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
95-98
EN
Fractographic analysis of Co- and Fe-based high strength soft magnetic materials showed the high localization of the plastic deformation and the ductility in narrow shear bands. The estimated fracture toughness of these materials is closely associated with the scale of the local plastic zone.
5
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Magnetic Properties of Iron-Based Amorphous and Nanocrystalline Fe-Zr-X-B (X: Cu, Al) Alloy Films

76%
Gościańska I., Toliński T., Ratajczak H., Sovák P., Dlugoš R., Konč M.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
463-466
EN
Thermal stability and magnetic properties of thin films, of a few Fe-based amorphous and nanocrystalline alloys, have been studied. The alloys belong to the class Fe-M-B, whose representatives are: Fe_{87}Zr_{4}Cu_{1}B_{8}, Fe_{87}Zr_{7}B_{6}, and Fe_{87}Zr_{7}Al_{1}B_{5} and are of particular interest because of their wide variety of magnetic properties. The films were prepared by flash evaporation onto liquid nitrogen cooled substrates. Measurements of the Kerr effect, the Hall effect, and ferromagnetic resonance in the films were carried out as functions of the annealing temperature. It was found that the changes in the coercive field H_{c}, resonance linewidth ΔH_{pp}, effective magnetization M_{eff}, Hall parameters, and resistance were correlated with the structural changes in the studied films.
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