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    Wyświetlanie 1-15 z 15
    Tytuł:
    Magnetostriction Measurements of (Fe-Co)-Mo-Cu-B Alloys with Varying Atomic Fe/Co Ratio
    Autorzy:
    Vlasák, G.
    Janičkovič, D.
    Švec, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813539.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.80.+q
    Opis:
    Amorphous rapidly quenched ribbons of $(Fe-Co)_{76}Mo_8Cu_1B_{15}$ with the ratio Co/Fe = 0, 1/9, 1/6, 1/4, 1/3, 1/2, 1/1 and 2/1 were prepared by planar flow casting. The dependence of the Curie temperature $T_C$ on Co/Fe ratio was determined. Due to the presence of the invar effect it was possible to measure the spontaneous volume magnetostriction in the temperature interval between 300 K and $T_C$. Field dependences of magnetostriction in parallel and perpendicular directions of applied magnetic field were obtained by direct measurement method. Subsequently, saturation magnetostriction and volume magnetostriction as well as forced magnetostriction were computed. Saturation magnetostriction increases with increasing Co/Fe ratio from 0 up to 17 ppm, depending both on the Co/Fe ratio and on the shift of $T_C$ with composition. The alloy with ratio Co/Fe = 0 exhibits $T_C$ near room temperature, thus field dependences of magnetostriction, corresponding to the dependences of a paramagnetic system are practically linear functions of applied field, corresponding to paramagnetic state.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 107-110
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Nanocrystalline Alloys after Electrons Irradiation
    Autorzy:
    Sitek, J.
    Holková, D.
    Dekan, J.
    Novák, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030257.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.45.+x
    61.46.-w
    75.50.Kj
    Opis:
    Nanocrystalline (Fe₃Ni₁)₈₁Nb₇B₁₂ alloy was irradiated by electron beams of doses up to 4 MGy. Irradiation had an influence on the magnetic microstructure of the studied alloys. It has manifested as a change in the mean orientation of local magnetization, intensity of the internal magnetic field, and distribution function of induction of internal magnetic field. All these parameters were determined from the measured Mössbauer spectra. The mean orientation of local magnetization was the most sensitive parameter. Structural changes were not identified by the Mössbauer spectroscopy and by X-ray diffraction. The results indicated that the changes of the microscopic magnetic parameters induced by irradiation depend on the phase composition. Intensity of internal magnetic field also contributes to resistivity of alloy against radiation.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 708-710
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of Multichannel Magnetometer Noise Floor in Ordinary Laboratory Conditions
    Autorzy:
    Praslička, D.
    Lipovský, P.
    Hudák, J.
    Šmelko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032168.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.20.Kk
    07.55.-w
    75.50.Kj
    Opis:
    The article deals with the method of the inherent noise estimation in each channel of a four channel relax-type magnetometer in general laboratory conditions. The day-long development of ambient magnetic field has been recorded and then the data were processed by correlation methods to separate inherent noises of the channels from ambient noise in the statistically best times. The method is applicable for noise estimation of any multi-channel sensoric system and also for the separation of deterministic and stochastic components of signals.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1123-1125
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Temperature on Magnetostrictive Delay Line Properties
    Autorzy:
    Salach, J.
    Charubin, T.
    Nowak, P.
    Jackiewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032231.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.80.+q
    75.50.Kj
    81.70.-q
    Opis:
    This paper presents results of tests performed on magnetostrictive delay line concerning its change in properties during temperature changes. Results indicate that an increase in temperature causes a decrease in wave amplitude and increase in the speed of propagation. The material used for the magnetostrictive delay line was an amorphous steel alloy of Fe-Si-B in tape form.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1183-1185
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties and Structure after Crystallization of $Fe_{80-x}B_{20}Nb_{x}$ (x=4, 6, 10) Metallic Glasses
    Autorzy:
    Nowosielski, R.
    Kądziołka-Gaweł, M.
    Gębara, P.
    Szyba, D.
    Babilas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398320.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.45.+x
    61.05.cp
    64.70.pe
    75.50.Kj
    Opis:
    The ferromagnetic Fe-based amorphous alloys were studied due to properties for soft magnetic applications. Depending on different Nb addition, the formation of crystalline phases after annealing of amorphous $Fe_{80-x}B_{20}Nb_{x}$ (x = 4,6,10) alloys was studied. The crystallization products as well as the phase structure were determined using the Mössbauer spectrometry combined with differential scanning calorimetry and magnetic measurements. The addition of Nb caused a shift of crystallization process towards higher temperatures and induced changes in coercive force and decreased the saturation magnetization. It was found that Nb addition changed the crystallization process from single crystallization for Fe₇₆B₂₀Nb₄ alloy to binary crystallization in the Fe₇₄B₂₀Nb₆ and Fe₇₀B₂₀Nb₁₀ glasses. The annealing process at the onset crystallization temperature induced complex phase formation including the α-Fe, Fe₃B, and Fe₂B phases for alloys x=4, 6.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1212-1216
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Noise Characteristics of Microwire Magnetometer
    Autorzy:
    Lipovský, P.
    Čverha, A.
    Hudák, J.
    Blažek, J.
    Praslička, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1202315.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.20.Kk
    07.55.-w
    75.50.Kj
    Opis:
    Current trends in modernization and miniaturization of ferroprobe sensors lead to replacement of amorphous ribbon cores with magnetic microwires. The miniaturization often causes degradation in the parameters of sensors, so, considering measurement of weak magnetic fields, it is necessary to explore noise parameters, temperature drift and stability of the magnetometer output value. The article deals with analysis of microwire sensor noise characteristics based on the experimental data processing. Using one second periodograms, the linear spectral density was processed. Obtained data are compared with corresponding parameters of a relax-type ferroprobe magnetometer.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 384-385
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advanced Method for Magnetic Microwires Noise Specification
    Autorzy:
    Praslička, D.
    Šmelko, M.
    Blažek, J.
    Hudák, J.
    Lipovský, P.
    Flachbart, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1200783.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    85.75.Ss
    Opis:
    The article points to the effects of the ambient noise and its possible influences on quantification of the inherent switching field noise of magnetic microwires. Based on the observed effects, an advanced methodology was developed to quantify the impact of the ambient noise. During measurements a multi-channel system with applied correlation methods was used. The proposed method determines the percentage contribution of the ambient noise deviation to the magnetic microwires switching field noise.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 86-87
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoimpedance Effect in Field Annealed $(FeNi)_{78}Nb_{7}B_{15}$ Amorphous and Nanocrystalline Bilayer Ribbons
    Autorzy:
    Varga, M.
    Marcin, J.
    Capik, M.
    Janičkovič, D.
    Švec, P.
    Škorvánek, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1367440.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.50.Tt
    75.60.Nt
    43.58.Bh
    Opis:
    The influence of the magnetic field annealing on the magnetoimpedance effect has been investigated in rapidly quenched $(Fe_{0.5}Ni_{0.5})_{78}Nb_{7}B_{15}$ monolayer and bilayer thin ribbons. The highest impedance ratio value $(ΔZ//Z)_{max}$=72% and the maximum field sensitivity $η_{max}$=12 %/Oe was obtained in the bilayer ribbon, annealed under longitudinal magnetic field at 773 K that exhibited nanocrystalline structure. The higher values of $(ΔZ//Z)_{max}$ in bilayer ribbons, as compared to their monolayer counterparts, are attributed to the increased ratio of their thickness to the penetration depth.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 122-123
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Thermomagnetic Treatment on Magnetoelastic Properties of FeNiMoB Amorphous Alloy
    Autorzy:
    Szewczyk, R.
    Svec, P.
    Salach, J.
    Švec, P.
    Bieńkowski, A.
    Hoško, J.
    Jackiewicz, D.
    Kamiński, M.
    Winiarski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1366528.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.80.+q
    75.50.Kj
    Opis:
    Paper presents the results of magnetoelastic tests of ring-shaped cores made of $Fe_{40}Ni_{38}Mo_{4}B_{18}$ amorphous alloy. The cores were subjected to thermomagnetic annealing under different values of magnetic field. The obtained results enabled us to connect the magnetoelastic characteristics of $Fe_{40}Ni_{38}Mo_{4}B_{18}$ amorphous alloy with the conditions of thermomagnetic treatment of the material.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 52-53
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Correlation between Magnetic and Structural Properties in Ni-Ti-Zr Metallic Glass
    Autorzy:
    Lisnichuk, M.
    Katuna, Yu.
    Saksl, K.
    Girman, V.
    Gamcová, J.
    Balga, D.
    Ďurišin, M.
    Kováč, J.
    Kollár, P.
    Sovák, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032297.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.Jy
    75.50.Kj
    61.43.Dq
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 741-743
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature behaviour of hyperfine magnetic fields in a Fe-Co-Si-B-Mo-P metallic glass followed with ⁵⁷Fe Mössbauer spectrometry
    Autorzy:
    Cesnek, M.
    Miglierini, M.
    Kmječ, T.
    Kohout, T.
    Amini, N.
    Janičkovič, D.
    Matúš, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1053048.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    75.75.-c
    76.80.+y
    Opis:
    Amorphous glass with nominal chemical composition Fe₅₁Co₁₂Si₁₆B₈Mo₅P₈ was studied by combination of the Mössbauer spectroscopy and magnetic measurements in order to characterize magnetic and structural features. Temperature evolution of the Mössbauer spectra revealed presence of broad distribution of hyperfine magnetic field at lower temperatures which vanishes with increase of temperature. The Curie temperature estimated from the Mössbauer spectroscopy experiments is T_{C} ≈ 392 K. This value is in a good agreement with that obtained by magnetic measurements (T_{C}=397 K). The Mössbauer spectroscopy spectra of the sample annealed at 823 K revealed a presence of crystalline components. This temperature is notably lower than the expected temperature of the onset of crystallization observed by differential scanning calorimetry ( ≈ 835 K).
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 744-746
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Temperature on Magnetization Processes in Amorphous Rapidly Solidified FeSiB/CoSiB Bilayer Ribbons
    Autorzy:
    Capik, M.
    Švec, P.
    Marcin, J.
    Kováč, J.
    Sopko, M.
    Janičkovič, D.
    Škorvánek, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1200803.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Ej
    75.80.+q
    Opis:
    Amorphous bilayers consisting of Fe-Si-B and Co-Si-B layers have been prepared by planar flow casting from a single crucible using a double-nozzle technique. Temperature dependencies of magnetization and hysteresis loops have been investigated in a wide temperature range. At room temperature, the effects of interlayer stresses, induced in material due to different thermal expansion coefficients of two mechanically interconnected soft magnetic layers, resulted in rounded hysteresis loops with flattened central part, indicating a dominant role of magnetization rotational processes. With an increase of measurement temperature, the interlayer stresses are relieved and the hysteresis loops became more squared.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 120-121
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Thermomagnetic Treatment on the Magnetoelastic Characteristics of Fe₆₁Co₁₉Si₅B₁₅ Amorphous Alloys
    Autorzy:
    Salach, J.
    Szewczyk, R.
    Svec Sr, P.
    Bieńkowski, A.
    Jackiewicz, D.
    Svec, P.
    Nowicki, M.
    Winiarski, W.
    Kachniarz, M.
    Gruszecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387877.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.80.+q
    75.50.Kj
    Opis:
    Information about magnetoelastic properties of newly developed amorphous magnetic alloys is very important from practical point of view, especially in the case of high permeability materials such as the Fe₆₁Co₁₉Si₅B₁₅ amorphous alloy. In the case of such materials, effect connected with the influence of external stresses on the magnetic properties of the alloy should be tested. This paper presents experimental results of the magnetoelastic properties investigation of the Fe₆₁Co₁₉Si₅B₁₅ amorphous alloy, annealed without magnetic field as well as in the magnetic field. Such thermo-magnetic treatment generated anisotropy has significant influence on the total free energy of magnetic material. In the magnetoelastic investigation, the compressive stress was applied to the ring shaped core, perpendicularly to the magnetizing field direction. Due to the fact, that cores with closed magnetic circuits were used, demagnetization did not change the balance of total free energy in the material.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 617-619
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Structural Characterization of Ni-Ti-Zr Metallic Glass
    Autorzy:
    Katuna, Yu.
    Lisnichuk, M.
    Saksl, K.
    Girman, V.
    Gamcová, J.
    Balga, D.
    Ďurišin, M.
    Kováč, J.
    Sovák, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032136.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    68.37.Ma
    68.37.Lp
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 750-752
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel Applications of Bistable Magnetic Microwires
    Autorzy:
    Sabol, R.
    Klein, P.
    Ryba, T.
    Hvizdos, L.
    Varga, R.
    Rovnak, M.
    Sulla, I.
    Mudronova, D.
    Galik, J.
    Polacek, I.
    Zivcak, J.
    Hudak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032633.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    75.60.Jk
    Opis:
    Few examples of technical and biomedical applications of bistable magnetic microwires are shown. Particularly, application of microwires in civil engineering are shown for sensing the mechanical stress in concrete, steel structure or steel cable by simple gluing it on the surface of studied structure. On the other hand, biomedical applications for sensing the stress, temperature, and position inside the human or animal body are shown. Experiments with pig intestine cells points to the biocompatibility of glass coated microwires.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1150-1152
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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