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Wyświetlanie 1-15 z 52
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:
Application of Neutron Refraction for Characterization and Optimization of High-Damping Iron-Based Alloys
Autorzy:
Udovenko, V. A.
Polyakova, N. A.
Chudakov, I. B.
Milczarek, J. J.
Mikke, K.
Powiązania:
https://bibliotekanauki.pl/articles/2011037.pdf
Data publikacji:
1999-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.12.-q
75.50.Bb
75.60.Ej
75.80.+q
Opis:
High-damping alloys with the magnetomechanical damping mechanism, based on the Fe-Cr system, have been studied. It has been shown that the direct investigation of the magnetic domain structure in the bulk materials using the neutron refraction method allows one to obtain important quantitative information concerning the formation of the high-damping state. The dependence of the damping capacity on the average magnetic domain size was found to possess a sharp maximum, thus revealing a range of the optimal domain sizes. The results obtained are important for the development of the technology of high-damping materials.
Źródło:
Acta Physica Polonica A; 1999, 96, 2; 303-306
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Mechanism of the High-Damping State Formation in the Fe-Mn-Si Shape Memory Alloys
Autorzy:
Udovenko, V. A.
Polyakova, N. A.
Turmambekov, T. A.
Powiązania:
https://bibliotekanauki.pl/articles/2011038.pdf
Data publikacji:
1999-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.-d
75.50.Bb
75.60.Ej
75.80.+q
Opis:
The structural mechanism of the high-damping state formation in the Fe-Mn-Si alloys has been investigated using transition electron microscopy and logarithmic decrement measurements. The high level of the elastic energy dissipation was found to be connected with a reversible movement of the Shockley dislocations under the sign changing stress action. The Shockley dislocations density and mobility are controlled by the alloys compositions and prior deformation value. The increase in the dislocations density with the help of the special cycling treatments can improve the alloys damping capacity.
Źródło:
Acta Physica Polonica A; 1999, 96, 2; 307-310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Magnetic Properties of URuGa
Autorzy:
Tran, V. H.
Troć, R.
Powiązania:
https://bibliotekanauki.pl/articles/1964580.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Qm
75.40.Cx
75.80.+q
Opis:
We present data of the magnetic susceptibility χ(T) and electrical resistivity ρ(T) for the hexagonal URuGa (space group P6̅2m). Below 7 K, χ increases rapidly and the data can be described by the expression χ(T) = χ(0)(1-a√T). ρ(T) in zero field follows the activated form: ρ(T)∼ exp(E$\text{}_{a}$/2k$\text{}_{B}$T ) with E$\text{}_{a}$ = 1.9 meV. In an applied magnetic field of 1 T, the resistivity varies as ρ(T)∼ bT. Between 18 and 250 K the resistivity is linear in -lnT and consistent with a Kondo-like effect.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 299-302
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Anisotropy and Magnetostriction Oscillations in Magnetic Multilayers
Autorzy:
Szymczak, H.
Żuberek, R.
Stobiecki, F.
Powiązania:
https://bibliotekanauki.pl/articles/2011101.pdf
Data publikacji:
1999-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
75.70.-i
75.70.Cn
75.80.+q
Opis:
Interlayer pseudodipolar coupling between two ferromagnets separated by nonmagnetic spacer is analyzed. It was shown that this type of interaction should induce magnetic anisotropy and magnetostriction oscillations. It was also predicted that both magnetic anisotropy and magnetostriction decrease with an increase in the spacer thickness. This effect was observed in [permalloy/Cu]$\text{}_{100}$ multilayers.
Źródło:
Acta Physica Polonica A; 1999, 96, 3-4; 495-499
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dipolar Contributions to Magnetoelastic Energy of Crystal Grains with Interfaces
Autorzy:
Szumiata, T.
Żuberek, R.
Szymczak, H.
Gonzalez, J.
Powiązania:
https://bibliotekanauki.pl/articles/2013177.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
68.90.+g
78.66.Jg
Opis:
The magnetic anisotropy and magnetostriction in nanocrystalline grains in non-magnetic or magnetic matrix (nanoparticles or nanocrystalline materials) differ from their bulk properties. The interactions between atoms at the interface play the important role in these magnetic properties. In this paper the magnetic dipolar contribution to magnetostriction energy has been calculated for spherical crystal grains (of bcc and fcc symmetry) with interface layer of atoms possessing different magnetic moment. Total magnetoelastic energy of the sphere-interface system is a sum of magnetoelastic energy of the sphere, energy of the interactions between the sphere and the interface and also the energy of the interface. It was shown that magnetoelastic energy depends on the sphere size and interface thickness.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 531-534
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress Monitoring in Steel Elements via Detection of AC Magnetic Permeability Changes
Autorzy:
Szumiata, T.
Hibner, K.
Dziewiecki, K.
Mazur, Z.
Gockiewicz, A.
Gzik-Szumiata, M.
Górka, B.
Witoś, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030407.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
75.60.Ej
75.50.Bb
75.30.Gw
62.20.D-
Opis:
The influence of mechanical stress on low frequency AC magnetic permeability was studied. The cold-drawn bars with C45 steel were subjected to investigation. The tensile stress (within elastic regime) was applied by means of material testing machine. Simple measuring system was assembled, which consisted of: function generator with magnetizing coil, detection coil and precise AC voltmeter. The registered changes of induced voltage were proportional to the change of magnetic permeability of the stretched rods. The obtained results were almost frequency-independent due to low frequency limit (250-500 Hz, weak eddy currents, no spin-origin energy dissipation). A significant magneto-mechanical hysteresis was observed slightly evolving from cycle to cycle with tendency of stabilization. The extension of basic Stoner-Wohlfarth model of magnetic permeability allowed to fit the data reproducing hysteretic behavior and considering the relaxation of the internal stress. The proposed, low-cost method is suitable in the industrial applications for stress control in large-sized steel elements.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 719-721
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Magnetostriction Model for MagNEMS
Autorzy:
Szumiata, T.
Gzik-Szumiata, M.
Powiązania:
https://bibliotekanauki.pl/articles/1201850.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.25.-g
85.85.+j
75.80.+q
85.70.Ec
68.35.-p
Opis:
In this work the influence of surface roughness on magnetostrictive nano-actuator parameters has been analyzed theoretically. A mechanical and magnetoelastic behavior of investigated cantilever bimorphic system has been described in the frame of the simple analytical model. Realistic material parameters have been incorporated into the model for high-magnetostrictive galfenol (Fe-Ga) thin films on silicon substrate. It has been shown that for 5 nm thick galfenol film a flat surface magnetostrictive effects modify the cantilever deflection and force only by 3%, whereas in the case of rough surface this influence increases to about 15%, when dimensions of roughness steps are comparable to the distances between them.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 200-201
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:
Strain Designed Magnetic Properties of III-V Magnetic Semiconductors
Autorzy:
Stagraczyński, S.
Jasiukiewicz, C.
Dugaev, V.
Berakdar, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402582.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
75.30.Gw
75.80.+q
Opis:
We present the theoretical analysis of a possibility of the magnetic anisotropy control using various components of the strain tensor in III-V magnetic semiconductor. We used the Kane model of the valence bands for the numerical simulations of the influence of strain on the Mn doped GaAs valence band structure. Calculating numerically the energy structure of deformed GaMnAs magnetic semiconductor, we also found the total energy of electron system as a function of orientation of the average magnetization vector. Our calculations show how the direction of the magnetization easy axis can be effectively rotated by using different types of deformation.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 219-221
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoelectric Effect in Magnetic Materials
Autorzy:
Siratori, K.
Kohn, K.
Kita, E.
Powiązania:
https://bibliotekanauki.pl/articles/1920605.pdf
Data publikacji:
1992-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
Opis:
Magnetoelectric effect in magnetic insulators is reviewed. Alter an intuitive explanation of the effect in antiferromagnetic Cr$\text{}_{2}$O$\text{}_{3}$, the following topics are discussed on the experiments. Measurement and controlling of antiferromagnetic domains as well as antiferromagnetic domain wall motion. Expansion of the free energy of crystals in terms of magnetic and electric fields and polarizations. Information on the magnetic symmetry of crystals. Investigation of mechanisms of magnetoelectric effect. Excited states and optical observation.
Źródło:
Acta Physica Polonica A; 1992, 81, 4-5; 431-466
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Amorphous Soft Magnetic $Fe_{80}B_{11}Si_{9}$ Alloy in Tensile Stress Sensors Application
Autorzy:
Salach, J.
Jackiewicz, D.
Bieńkowski, A.
Szewczyk, R.
Gruszecka, M.
Powiązania:
https://bibliotekanauki.pl/articles/1367312.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.1q
75.50.Kj
Opis:
Paper presents the results of investigations of the influence of the tensile stresses on magnetic characteristics of $Fe_{80}B_{11}Si_{9}$ amorphous alloy in as quenched and annealed state. For the tests, a special methodology of application of uniform tensile stresses to the ring shaped sample was developed. Due to special non-magnetic pads, the magnetizing and sensing coils can be wound around the core. Experimental results indicate high stress sensitivity of $Fe_{80}B_{11}Si_{9}$ alloy in both as-quenched and annealed state. Permeability of the core decreases over 64% and 58% for as-quenched and annealed core respectively, especially for lower values of the amplitude of magnetizing field.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 102-103
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:
Magnetoelastic Properties of Hitperm-Type Alloys from Torque Moment
Autorzy:
Salach, J.
Bieńkowski, A.
Szewczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1813578.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
75.80.+q
Opis:
The following paper presents the results of the investigation on the influence of the torque on the magnetic characteristics of the Hitperm-type $Fe_{41.5}Co_{41.5}Cu_1Nb_3B_{13}$ alloy, in as-quenched and nanocrystalline state. The methodology of application of the torque to the ring-shaped core is also described. This methodology gives a possibility of achieving uniform shearing stresses in the core. The results indicate that shearing stress sensitivity of Hitperm-type alloys depends on the annealing and nanocrystallization process. This effect should be considered during the development of magnetoelastic torque sensors.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 115-118
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Method of Measurement of the Magnetoelastic Characteristics for Tensile Stresses
Autorzy:
Salach, J.
Szewczyk, R.
Bieńkowski, A.
Kolano-Burian, A.
Falkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1507139.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
75.50.Kj
Opis:
The paper presents a novel method of measurements of tensile stress dependence of the magnetic characteristics of ring-shaped cores made of soft amorphous alloys. In the presented method, the uniform tensile stress was applied perpendicularly to the magnetizing field direction. Magnetoelastic core with closed magnetic circuit was fixed on the non-magnetic backings enabling the conversion of compressive force into tensile stresses as well as it enables the core to be winded by magnetizing and sensing windings. Magnetoelastic characteristics measured under tensile stress, for $Fe_{25}Ni_{55}Si_{10}B_{10}$ alloy annealed in temperature 350°C for 1 h, are presented in this paper. The presented results indicate high tensile stress sensitivity of $Fe_{25}Ni_{55}Si_{10}B_{10}$ alloy. Moreover, together with magnetoelastic characteristics for compressive stresses (presented previously in the literature), the describes results create possibility of further development of models of the magnetoelastic effects in amorphous alloys.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 775-777
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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