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Wyświetlanie 1-15 z 52
Tytuł:
Spontaneous Magnetostriction of $Lu_2Fe_{17-x}Si_x$
Autorzy:
Andreev, A.
Daniš, S.
Powiązania:
https://bibliotekanauki.pl/articles/1813624.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
75.80.+q
Opis:
Thermal expansion of $Lu_2$ $Fe_{17-x}Si_x$ solid solutions was measured by X-ray powder diffraction. The magnetic ordering in all compounds within the homogeneity range (x≤3. 4) is accompanied by a large spontaneous volume magnetostriction distributed anisotropically over the principal axes of the hexagonal crystal structure. The volume effect ω_s in the ground state reaches $14.7×10^{-3}$ in $Lu_2Fe_{17}$ and decreases monotonously to $8.9×10^{-3}$ at x = 3.4 following the reduction of magnetic moment. Despite still large $ω_s$, the Invar behavior observed in $Lu_2Fe_{17}$ changes to a positive thermal expansion for x >1 due to increasing Curie temperature.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 239-242
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on Structural, Dielectric, and Electrical Properties of a $Ni_{0.284}Zn_{0.549}Cu_{0.183}Fe_{1.984}O_4$ Piezomagnetic Material
Autorzy:
Balusamy, R.
Kumaravel, P.
Kanagathara, N.
Gowri Shankar Rao, R.
Renganathan, N.
Powiązania:
https://bibliotekanauki.pl/articles/1398351.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
77.22.-d
77.22.Gm
68.37.Hk
Opis:
Piezomagnetic materials in composition $Ni_{0.284}Zn_{0.549}Cu_{0.183}Fe_{1.984}O_4$ were prepared by mixed oxide method at 1100°C. Powder X-ray diffraction studies confirm the crystalline nature of the synthesized $Ni_{0.284}Zn_{0.549}Cu_{0.183}Fe_{1.984}O_4$ piezomagnetic material. The crystallite size is calculated to be 19.332 μ m using the Debye-Scherrer formula. The surface morphology and particle size of the samples has been studied by scanning electron microscopy. The thermal stability and decomposition behaviour of $Ni_{0.284}Zn_{0.549}Cu_{0.183}Fe_{1.984}O_4$ piezomagnetic material have been studied by thermogravimetric analysis at a heating rate of 15°C/min. The effective activation energy of the prepared composite was calculated using single heating rate methods: Broido's and Coats-Redfern methods. Dielectric properties of $Ni_{0.284}Zn_{0.549}Cu_{0.183}Fe_{1.984}O_4$ piezomagnetic material have been studied in a wide range of frequencies and temperatures. The magnetic behavior of $Ni_{0.284} Zn_{0.549} Cu_{0.183} Fe_{1.984}O_4$ piezomagnetic material at room temperature has been confirmed by vibrational sample magnetometer studies.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 751-757
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Diamagnetism of $YbPb_3$ Compound: Pressure Effects
Autorzy:
Baranovskiy, A.
Grechnev, G.
Panfilov, A.
Svechkarev, I.
Żogał, O.
Czopnik, A.
Hackemer, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813626.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Lp
75.80.+q
Opis:
The effect of a uniform pressure on the magnetic susceptibility was measured for $YbPb_3$ compound, wherein a degeneracy point of the energy bands is located just below the Fermi level and responsible for the anomalous diamagnetism. Theoretical analysis of the experimental data has revealed that a pronounced increase of diamagnetism with pressure is governed by closing the degeneracy point towards the Fermi energy
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 243-246
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Industrial Application of Magnetoelastic Force and Torque Sensors
Autorzy:
Bieńkowski, A.
Szewczyk, R.
Salach, J.
Powiązania:
https://bibliotekanauki.pl/articles/1535213.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
07.10.Pz
Opis:
Due to their sensitivity, robustness and the flat shape, the magnetoelastic sensors create new possibilities of industrial applications. This paper presents the results of the field tests of using the magnetoelastic sensors with amorphous alloy ring-shaped cores for ignition detection in locomotive's diesel engines as well as measurements of the torque during the operation of ball valves. Presented results confirm usability of amorphous alloy based, magnetoelastic sensors for specific industrial applications.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 1008-1009
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Magnetoelastic Characteristics of $Fe_{70}Ni_8Si_{10}B_{12}$ Amorphous Alloy Subjected to Thermo-Magnetic Treatment
Autorzy:
Bieńkowski, A.
Salach, J.
Szewczyk, R.
Kolano, R.
Powiązania:
https://bibliotekanauki.pl/articles/1813532.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
75.50.Kj
Opis:
This paper presents the experimental results of the magnetic and magnetoelastic investigation on the properties of $Fe_{70}Ni_8Si_{10}B_{12}$ amorphous alloy, subjected to thermo-magnetic treatment. Samples were annealed at temperature 350°C for 1 hour, in parallel magnetic field (4 kA/m), as well as in transverse field (350 kA/m). Sample annealed without magnetic field was also tested. Magnetoelastic tests were performed under uniform compressive stress, applied to the ring-shaped core, perpendicularly to the direction of magnetizing field. The results indicated that the thermo-magnetic heat treatment changes the magnetic characteristics, but does not have a significant influence on the coarse of magnetoelastic characteristics of $Fe_{70}Ni_8Si_{10}B_{12}$ amorphous alloy.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 87-90
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoelastic Properties of La$\text{}_{0.744}$Ba$\text{}_{0.186}$MnO$\text{}_{3}$ Single Crystals
Autorzy:
Bukhantsev, Yu.
Mukovskii, Ya. M.
Vasiliev, S.
Kundys, B.
Szymczak, H.
Powiązania:
https://bibliotekanauki.pl/articles/2037121.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.47.Lx
75.30.Gw
75.80.+q
Opis:
Magnetoelastic properties of La$\text{}_{0.744}$Ba$\text{}_{0.186}$MnO$\text{}_{3}$ single crystals have been studied. The basic magnetoelastic constants of the crystal have been estimated using the data of magnetostriction and magnetization measurements, which have been carried out in [010] and [110] crystallographic directions in a wide temperature range from 10 K to 150 K. The anomaly of the thermal expansion has been observed at about 185 K. Near this anomaly two almost degenerated phase transitions have been observed. One of these transitions may be related to the structural phase transition, while the second one to the occurrence of spontaneous strains. The magnetostriction of La$\text{}_{0.744}$ Ba$\text{}_{0.186}$MnO$\text{}_{3}$ single crystal seems to arise due to the effect of applied field on the spontaneous strains.
Źródło:
Acta Physica Polonica A; 2004, 105, 1-2; 155-162
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:
Surface Treatment Effect on Bulk Magnetoelastic Properties of High Damping Fe-Based Alloys
Autorzy:
Chudakov, I. B.
Udovenko, V. A.
Powiązania:
https://bibliotekanauki.pl/articles/1945271.pdf
Data publikacji:
1996-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.40.+i
75.50.Bb
75.60.Ej
75.80.+q
Opis:
Binary and complex alloyed high damping steels on the base of Fe-Cr and Fe-Al systems was investigated. It was shown that already slight surface treatment leads to the increase in magnetic anisotropy of the material and to the decrease in damping capacity.
Źródło:
Acta Physica Polonica A; 1996, 89, 3; 425-430
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Studies of Polycrystalline Magnetostrictive CoPd Films with Large Planar Strain
Autorzy:
Dubowik, J.
Szymański, B.
Powiązania:
https://bibliotekanauki.pl/articles/1931333.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.80.+q
Opis:
We report on ferromagnetic resonance and torque curves measurements in electrodeposited CoPd alloy films with composition ranged from Co$\text{}_{13}$Pd$\text{}_{87}$ to Co$\text{}_{45}$Pd$\text{}_{55}$. We show that the origin of the multimode structure of ferromagnetic resonance spectra in these strongly magnetostrictive polycrystalline films can be satisfactorily explained on the basis of the independent-grain-approach for a textured microstructure. The fourfold periodicity of the torque curves for the compositional range of 30-35 at% of Co seems to be originated by the microstructure features which lead to a distribution of the easy axis directions within the films.
Źródło:
Acta Physica Polonica A; 1994, 85, 5; 863-867
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joule Heating Preannealing Effect in the Coercivity Field and Magnetostriction Constant of Co$\text{}_{66}$Fe$\text{}_{4}$Mo$\text{}_{2}$Si$\text{}_{16}$B$\text{}_{12}$ Alloy
Autorzy:
Garcia Tello, P.
González, J.
Blanco, J.
Żuberek, R.
Powiązania:
https://bibliotekanauki.pl/articles/2013239.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.30.Gw
75.80.+q
Opis:
The effect of thermal treatments (by the Joule heating and conventional annealing) on the coercivity and saturation magnetostriction constant in the amorphous and nanocrystalline Co$\text{}_{66}$Fe$\text{}_{4}$Mo$\text{}_{2}$Si$\text{}_{16}$B$\text{}_{12}$ alloy is reported. It is noticeable the near insensibility to the external stress of coercive field and anisotropy field (leading to extremely low value of magnetostriction 1.5×10$\text{}^{-8}$) achieved after the Joule heating by two steps (first one to relax the internal stresses and the second one to develop a fine nanocrystalline structure).
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 595-598
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Active LR Integrator Circuit for Drift-Free Magnetoelastic Transducer
Autorzy:
Gazda, P.
Nowicki, M.
Kachniarz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030439.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.55.-w
75.50.Kj
75.80.+q
Opis:
Current integrator systems usually use active RC integrator circuits. Crucial dificulty associated with this analogue system is the integrator drift. The following paper presents the idea of the active integrator circuit based on inductive and resistive components. This concept allows to eliminate the time drift of the circuit, which is undesired phenomenon resulting from capacitive components working in the traditional negative feedback loop. The SPICE simulations were performed to validate the presented idea. Then, prototype circuit with discrete components was tested. Inductors were based on nanocrystalline and air cores. The developed solution was tested as magnetoelastic sensors transducer, to confirm the ability for long-term, continuous, drift-free, integrator circuit operation. The results were compared with traditional, RC circuit with automatic drift compensation.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 745-747
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Evolution of Magnetic Interactions in Ni Nanowires Embedded in Polycarbonate Membranes by Ferromagnetic Resonance
Autorzy:
Ghaddar, A.
Gieraltowski, J.
Gloaguen, F.
Żuberek, R.
Aleshkevych, P.
Kazmierczak, J.
Slawska-Waniewska, A.
Szymczak, H.
Powiązania:
https://bibliotekanauki.pl/articles/1585046.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Hj
75.80.+q
75.30.Gw
Opis:
Ni polycrystalline nanowires with diameters of 50, 80, and 100 nm were electrodeposited in cylindrical pores of track-etched polycarbonate membranes. Their magnetic properties were determined as a function of temperature using ferromagnetic resonance and magnetization measurements. At room temperature, the uniaxial anisotropy is equal to the shape anisotropy whereas an additional contribution is evidenced at low temperature. This additional contribution is attributed to magnetoelastic effects induced in the nanowires due to the different thermal expansion constants of Ni and polycarbonate. The analysis of magnetization processes in Ni nanowire arrays evidenced strong dipolar interactions inside the wires due to the domain structure. The coercive field of the nanowires was shown to be nearly a linear function of the temperature and could be accounted for temperature dependence of the uniaxial anisotropy.
Źródło:
Acta Physica Polonica A; 2009, 116, 6; 1039-1043
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Brillouin Light Scattering Investigations οf Magnetic and Elastic Properties in MBE Grown Trilayer Mo/Co/Au Systems
Autorzy:
Gieniusz, R.
Błachowicz, T.
Maziewski, A.
Petroutchik, A.
Baczewski, L.
Wawro, A.
Hamrle, J.
Serga, O.
Hillebrands, B.
Powiązania:
https://bibliotekanauki.pl/articles/1810471.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.50.+g
75.70.Cn
75.80.+q
Opis:
The magnetic and elastic properties of epitaxially grown Mo/Co/Au trilayer systems were investigated by the Brillouin light scattering and a ferromagnetic resonance. Using both experimental methods the perpendicular uniaxial anisotropy and the effective in-plane twofold anisotropy contributions were determined as the function of the cobalt thicknesses. Acoustic phonons analysis shows that the elastic constants are decreased with increasing cobalt layer thicknesses.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 213-216
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excitation of Bulk Spin Waves by Acoustic Wave at the Plane Defect of a Ferromagnet
Autorzy:
Gusieva, Y.
Graczyk, P.
Gorobets, O.
Krawczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030772.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.78.-n
75.80.+q
Opis:
Excitation of bulk spin waves by acoustic wave localized on the elastic planar defect in the bulk ferromagnet was analytically and numerically investigated. We showed that besides magnetic oscillations forced by acoustic wave strain the resonance between Kosevich wave and bulk spin wave can occurs. For the frequency of the Kosevich wave far below the resonance frequency the amplitude of dynamic magnetization is negligible. For the frequency above the resonance the acoustic wave excites bulk spin wave of the same frequency but different absolute value of the wave vector.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 489-491
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic domain structure and magnetically-induced reorientation in Ni-Mn-Ga magnetic shape memory alloy
Autorzy:
Heczko, O.
Bradshaw, V.
Powiązania:
https://bibliotekanauki.pl/articles/1053119.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Cc
75.60.Ch
75.80.+q
Opis:
Magnetization process during magnetically induced reorientation and related magnetic domains of cuboid Ni_{50}Mn_{28.5}Ga_{21.5} single crystal with {100} faces was investigated. Magnetic domains were visualized using magneto-optical indicator. The domains pattern is determined by strong uniaxial magnetic anisotropy of Ni-Mn-Ga martensite. Thanks to magnetically induced reorientation the domains arrangements for all three crystal orientations could be obtained and we showed that the size of domains scales with square root of the thickness and penetrates through whole crystal. Visualization of magnetic domains on all faces of cuboid provides the 3D model of magnetic domains.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1063-1065
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 52

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