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1
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Phase Composition and Magnetic Properties of Nanoperm Thin Films Doped with Yttrium

100%
Brzózka K., Sovák P., Szumiata T., Górka B., Gawroński M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1270-1272
EN
Thin films of Nanoperm alloys with partial substitution of iron by yttrium are the subject of investigations. The attention is fixed on the influence of yttrium substitution on structure and magnetic characteristics of the samples. The effect of film thickness is also considered. Conversion electron Mössbauer spectroscopy and magneto-optic Kerr effect were used to derive hyperfine parameters and coercive field, respectively. Coexistence of crystalline bcc-Fe phase and an amorphous one with diverse proportion was stated in most of the samples. It was found that surface and interface regions contribute to the magnetic properties of films.
2
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Properties of Fe_{73.5-x}Si_{13.5}B_9Cu_1Nb_3Mn_x Alloys by Means of Mössbauer Spectroscopy

100%
Brzozowski R., Wasiak M., Balcerski J., Sovák P., Moneta M.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
127-130
EN
Fe_{73.5-x}Si_{13.5}B_9Cu_1Nb_3Mn_x (x=1, 3÷15) amorphous alloys were studied by means of Mössbauer spectroscopy, as-quenched and after annealing. The basic alloys show stronger magnetic ordering for small values of x, than for larger x. The initially amorphous phase and the final nanocrystalline structure were determined with X-ray diffraction. The alloys were shown, by scanning calorimetry, to suffer different phase transformations, when heated.
3
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Influence of Annealing Treatment on the Structure and Magnetic Properties of Fe-Al-Cu-Nb-Si-B Alloys

100%
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.
4
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Mössbauer Study of Magnetic Texture of Finemet-Type Ribbons

100%
Brzózka K., Sovák P., Górka B., Szumiata T., Gawroński M.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
33-36
EN
Magnetic texture of amorphous Finemet-type alloys substituted by Co, Ni, Mn, Ge and V was investigated by means of Mössbauer spectroscopy using various angular configurations. Samples in form of ribbons were manufactured by single-roller melt spinning technique. In most of investigated alloys some preference of alignment of atomic magnetic moments in-plane of sample is stated, except of some alloys substituted by germanium in which slight tendency to out-of plane spin orientation is proved.
5
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Some Magnetic Properties of Thin Films Prepared from Fe-(M-NO-Si-B (M=Cu, Ag, Pt, Pd) Alloys

100%
Gościańska I., Ratajczak H., Sovák P., Konć M., Matta P.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
423-426
EN
Saturation magnetic induction, B_{s}, and coercive field, H_{c}, have been studied upon annealing in films flash evaporated from Fe_{73.5}M_{1}Nb_{3}Si_{13.5}B_{8} alloys. The changes in B_{s} significantly diverged at increasing annealing temperature, T_{a}, and did not indicate any formation of ultrafine grain phase in the films. H_{c} measured as an angular function in the plane of the films revealed oscillations due to weak in-plane anisotropy. The coercivity increased in the course of annealing at increasing T_{a}, while the in-plane anisotropy decreased at the same time.
6
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Influence of Film Thickness on the Microstructure and Magnetic Properties of Finemetic Thin Films

100%
Dlugoš R., Sovák P., Balcerski J., Füzer J., Kollár P.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
447-450
EN
The aim of this work was to study the influence of film thickness on the structure and magnetic properties of finemetic thin films after annealing. Thin films with the various thickness (from 20 nm up to 700 nm) were prepared by DC sputtering method. The heat treatments of the films for further structural and magnetic observations were performed at the temperature range 300-500°C for 15 min in vacuum furnace. Structural observations were carried out by transmission electron microscopy. Coercivity was determined from hysteresis loops traced with fluxmeter and Kerr magnetooptical hysteresisgraph. All the experimental results confirm a different magnetic behaviour of the thin films according to their thickness.
7
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Local Structure and Magnetic Characteristics of FINEMET Alloys Substituted by Vanadium

86%
Brzózka K., Szumiata T., Gawroński M., Górka B., Sovák P., Pavlík G., Kolesár V.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
51-54
EN
Amorphous and nanocrystalline FINEMET-type alloys with vanadium addition up to 7 at% were investigated by the MÖssbauer spectroscopy and magnetic methods. The outcomes evidence alterations in grain structure, although the main effect is related to the changes in intergranular phase. This induces diminution of mean hyperfine field, saturation induction and Curie temperature as well as the increase in coercivity.
8
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Effect of Annealing Time on Structure of Fe_{72.5}Cu_{1}Nb_{2}Mo_{2}Si_{15.5}B_{7} Alloy

86%
Nemcová V., Girman V., Hrabčáková V., Michalik Š., Bednarčík J., Almáši M., Sovák P.
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vol. 126
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issue 1
116-117
EN
The process of a primary crystallization of the Fe_{72.5}Cu_{1}Nb_{2}Mo_{2}Si_{15.5}B_{7} alloys was investigated by differential thermal analysis (DTA), x-ray diffraction (XRD) and transmission electron microscopy (TEM). Amorphous ribbons were isothermally annealed for 0.5, 2, 6, 30 and 150 minutes at 520 °C. Both, the XRD and TEM study showed that the level of devitrification of the sample increases with the annealing time. The above mentioned techniques confirmed the presence of the nanocrystalline grains of the Fe_{3}Si phase and enable us to study the evolution of the identified phase.
9
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Study of Local Structure of Fe_{84}B_{16} Amorphous Alloy by Electron Diffraction

86%
Hrabčáková V., Michalik Š., Borisenko K., Girman V., Nemcová V., Sovák P.
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vol. 126
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issue 1
130-131
EN
Local atomic structure in Fe_{84}B_{16} metallic glass, prepared by melt-spinning technique in He atmosphere, was studied by electron diffraction (ED) reduced density function (RDF) analysis. RDF curves were also obtained from X-ray diffraction (XRD) patterns and compared with the data from ED. Atomic reduced density functions, G(r), calculated from ED and XRD patterns showed good agreement. Atomic structure model has been fitted to the experimental ED data using Reverse Monte Carlo (RMC) simulation.
10
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Finemet Thin Films Substituted by Chromium - CEMS and MOKE Study

86%
Brzózka K., Szumiata T., Sovák P., Górka B., Hibner K., Balcerski J.
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issue 5
794-796
EN
Conversion electron Mössbauer spectroscopy and magneto-optical Kerr effect were applied to investigate hyperfine interactions and macroscopic magnetic properties of Finemet-type thin films. Phase analysis as well as compositional evolution of hyperfine parameters and coercivity was performed in the range of chromium percentage 0 ≤ x ≤ 14. Essential differences in structure and hyperfine parameters were found for films of different chromium concentration. Coercivity shows non-monotonic dependence with minimal value at x = 5.
11
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Magnetic Properties of Iron-Based Amorphous and Nanocrystalline Fe-Zr-X-B (X: Cu, Al) Alloy Films

86%
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.
12
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The Structural Characterization of Ni-Ti-Zr Metallic Glass

73%
Katuna Y., Lisnichuk M., Saksl K., Girman V., Gamcová J., Balga D., Ďurišin M., Kováč J., Sovák P.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
750-752
EN
Metallic glasses, in contrast to its crystalline counterparts, exhibit unique mechanical and structural properties, which make them attractive for practical applications. Especially Ni-Ti-Zr metallic glass is a promising alloy for micromechanical systems because of its known shape memory properties. Shape memory effect is connected with structural phase transformation. In this paper, the ambient-temperature-structure of Ni-Ti-Zr metallic glass is investigated using transmission electron microscopy and synchrotron X-ray diffraction, the surface and chemical analysis is documented using scanning electron microscopy. Thermal stability of the alloy has been determined using differential scanning calorimetry.
13
Content available remote

The Correlation between Magnetic and Structural Properties in Ni-Ti-Zr Metallic Glass

73%
Lisnichuk M., Katuna Y., Saksl K., Girman V., Gamcová J., Balga D., Ďurišin M., Kováč J., Kollár P., Sovák P.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
741-743
EN
The Ni-Ti-Zr metallic glasses are due to their known shape memory properties promising alloys e.g. for micromechanical applications. In this paper structure and structure stability of one particular alloy Ni₆₀Ti₂₅Zr₁₅ at.% were examined by means of X-ray diffraction and transmission electron microscopy while magnetic properties were ascertained by vibrating-sample magnetometer with maximal applied field of 100 kA/m in the temperature range of 300-1073 K.
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