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Tytuł:
In Situ Energy Dispersive X-Ray Diffraction Analysis of the Temperature-Pressure Stability of Co-Fe-(Ta,W)-B Alloys
Autorzy:
Kanász, R.
Bednarčík, J.
Saksl, K.
Nicula, R.
Stir, M.
Lathe, C.
Powiązania:
https://bibliotekanauki.pl/articles/1813530.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
Opis:
In this work two $Co_{53.5}Fe_{10}X_{5.5}B_{31}$ (X = Ta, W) alloys were synthesized from high purity (≥99.9%) powder elements by means of mechanical alloying. In case of Ta-addition, mechanical alloying resulted in formation of two component material with nanocrystalline phase embedded in amorphous matrix. On the other hand, substitution of Ta by W retards partial amorphization induced by mechanical alloying. High pressure-temperature stability of both alloys was monitored using in situ energy dispersive X-rays.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 79-82
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetostatic Energy Associated with Variation of Local Magnetization Direction in Field Annealed Amorphous Ribbons
Autorzy:
Ciobotaru, I.
Rezlescu, N.
Anghelache, R.
Powiązania:
https://bibliotekanauki.pl/articles/1955837.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
Opis:
It is shown that in field annealed amorphous ribbons (with oblique intrinsic anisotropy), the magnetostatic energy associated with spatial fluctuations of the local magnetization depends on the magnetization state. The corresponding magnetostatic interactions can play an important part in the magnetic behaviour of the amorphous ribbons with small macroscopic anisotropy.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 427-430
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Soft Magnetic Properties and Temperature Stability of Co-Fe-Zr-B Metallic Glasses
Autorzy:
Bednarčík, J.
Kováč, J.
Roth, S.
Fűzer, J.
Kollár, P.
Varga, L.
Franz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1813531.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
Opis:
In the present work multicomponent Co-based alloys with nominal composition $Co_{72-x}Fe_xZr_8B_{20}$ (x=10, 15, and 20 at. %) were synthesized by single-roller melt-spinning. The measurement of coercivity, $H_c$, reveals the soft magnetic behavior of investigated alloys. The value of $H_c$ increases from 23 A/m for alloy with x=10 at. % up to 32 A/m for alloy with x=20 at. %. Further it was found that crystallization temperature of as-quenched alloys slightly varies with iron content and lays between 605 and 625°C. From the temperature dependence of magnetization it follows that partial substitution of cobalt by iron has positive influence on the Curie temperature of amorphous phase, $_cT^{am}$, which increases from 300°C up to 462°C for alloy with x=10 at. % and x=2 0 at. %, respectively.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 83-86
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of Frame-Shaped Fluxgate Sensor Core made of Amorphous Alloy Using Generalized Magnetostatic Method of Moments
Autorzy:
Szewczyk, R.
Frydrych, P.
Powiązania:
https://bibliotekanauki.pl/articles/1032692.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.75.Ss
75.50.Kj
Opis:
Fluxgate magnetic field sensors are commonly used in the industry, navigation as well as in non-destructive testing. Moreover, recent development of such sensors is focused on effective application of thin layer magnetic cores, such as made of amorphous alloys. However, effective development of fluxgate sensors require method of modeling its core taking into account demagnetization. The paper presents the results of optimization of the shape of thin-layer core for fluxgate sensor. Due to the fact that possibility of application of finite elements method is limited in the case of thin layer, the method of moments was used. Considering the geometry of the core as well as magnetizing and sensing winding, the optimal proportion of the length/thickness parameter was determined from the point of view of sensor sensitivity. It was proven that value of this optimal proportion is strongly dependent of thickness of the core.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 660-662
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Angular dependence of magnetization reversal in microwire studied by MOKE
Autorzy:
Váhovský, O.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1054831.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
Opis:
In this work we present magneto-optical Kerr effect study of magnetization processes in amorphous glass - coated microwire of composition Fe_{77.5}Si_{7.5}B_{15}. Unique results obtained from microwire were compared to results of similar measurements on polycrystalline ribbon Co_2FeSi. In both cases reversal of longitudinal and transversal component of surface magnetization was studied. There was just a small variation in total change of magnetization caused by change in the direction of magnetic field in case of square hysteresis loops measured on microwire. However, switching field was angularly dependent and the change was considerably high and well predictable. The last two facts make such microwires outstanding candidates for sensors of magnetic field direction or spatial orientation.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 648-650
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:
Magnetic Properties of Icosahedral (Au,Cu)-Al-Yb Quasicrystals
Autorzy:
Oki, S.
Hiroto, T.
Muro, Y.
Tamura, R.
Powiązania:
https://bibliotekanauki.pl/articles/1373451.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.20.Hr
Opis:
We have synthesized Cu-substituted (Au,Cu)-Al-Yb quasicrystals in order to investigate the relationship between the quasilattice constant and the magnetic property. The quasilattice constant $a_{R}$ is found to decrease as Au is replaced by Cu, and the maximum reduction of 2.18% in $a_{R}$ was observed for x=0.60 in $(Au_{1-x}Cu_x)_{49}Al_{34}Yb_{17}$. Magnetic measurements of $(Au_{1-x}Cu_x)_{49}Al_{34}Yb_{17}$ (x=0, 0.10, 0.20, 0.50) show that the intermediate-valence state of Yb persists in all the studied compositions. The effective magnetic moment is found to depend on r̅/$a_{R}$ rather than on the quasilattice constant $a_{R}$. This suggests that r̅/$a_{R}$ can be regarded as a measure of the chemical pressure induced on the Yb atoms.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 553-555
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Directional Ordering in Amorphous $Fe_{43}Ni_{43}Zr_7Cu_1B_6$ Ferromagnetic Alloys
Autorzy:
Varga, M.
Varga, R.
Vojtaník, P.
Hernando, B.
Prida, V.
Santos, J.
Pérez, M.
Powiązania:
https://bibliotekanauki.pl/articles/1533987.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Nt
Opis:
Development of the atomic directional ordering in the $Fe_{43}Ni_{43}Zr_7Cu_1B_6$ alloy, during its conventional the same as after transverse magnetic field annealing, was experimentally studied by the amplitude dependence of susceptibility and hysteresis loops measurements, respectively. Diffusion processes of the mobile atoms caused perminvar effect, decrease of the initial susceptibility, increase of the critical field, and linear shape of the hysteresis loop. Uniaxial magnetic anisotropy, created during magnetic field annealing of the FeNiZrCuB alloy, was confirmed also by observation of the surface domain structure.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 804-806
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:
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:
Perminvar Effect in Amorphous Hitperm Alloy
Autorzy:
Varga, M.
Varga, R.
Vojtanik, P.
Komova, E.
Powiązania:
https://bibliotekanauki.pl/articles/1813579.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Lr
Opis:
Influence of the directional ordering on magnetization processes in the amorphous $Fe_{44.5}Co_{44.5}Zr_7B_4$ alloy was investigated in the temperature region of 27 to 300°C for stabilization times of up to 1000 min by means of the Perminvar effect. The time-temperature dependent Perminvar effect was found to be very sensitive on the stage of the domain structure stabilization. The Perminvar critical fields $H_{CR}$ were shifted to higher values with increasing stabilization temperatures and times. At lower temperatures, the susceptibility increases over wide range of the measuring fields. Stabilization at higher temperatures causes that the susceptibility abruptly increases in the narrow field range. The record critical field $H_{CR} =246 Am^{-1}$ was obtained.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 119-122
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and Chemical Properties of FINEMET-Type Amorphous Alloys
Autorzy:
Zábranský, K.
Jirásková, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1813581.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Nt
Opis:
Influence of composition variations on the physical and chemical properties of rapidly quenched NANOPERM-type, FeNbCuB, and FINEMET-type, Fe(Ni)NbCu(Si)B, alloys in amorphous states, is investigated by Mössbauer spectroscopy, magnetic and electrochemical methods. While the partial substitution of Si for B leads to weak effects, that of Ni for Fe results in pronounced changes of both magnetic properties and chemical stability.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 123-126
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress Dependence of the Switching Field in Glass Coated Microwires
Autorzy:
Komová, E.
Varga, M.
Varga, R.
Vojtaník, P.
Torrejon, J.
Provencio, M.
Vázquez, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813586.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
Opis:
Here we present the study of the stress dependence of the switching field in amorphous glass-coated magnetic microwire of composition FeNiMoB. Samples were heat treated in the temperature range from 250°C up to 500°C in order to obtain relaxed and nanocrystalline state. As-cast microwire shows strong stress dependence of the switching field, which decreases with the temperature of annealing. The sample is almost not stress dependent after heat treatment at 425°C, because the magnetostriction vanishes. However, the strongest stress dependence was found for the microwire annealed at 400°C, just below the optimal annealing temperature to obtain the nanocrystalline state.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 135-138
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Findings in Mössbauer Studies of Amorphous FeMoCuB NANOPERM-Type Alloy
Autorzy:
Jirásková, Y.
Maryško, M.
Miglierini, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813591.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.80.+q
Opis:
The effect of heat treatments at 603 K (a relaxation of an amorphous structure) and at 723 K (an onset of a bulk nanocrystallization) of a rapidly quenched $Fe_{76}Mo_{8}Cu_{1}B_{15}$ alloy is studied. The differences in sample processing are reflected in magnetization direction as seen by room- and low-temperature Mössbauer spectroscopy.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 151-154
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Susceptibility Spectroscopy in FeNiSiB Microwires
Autorzy:
Olivera, J.
Gamcova, J.
Varga, R.
Santos, J.
Prida, V.
Sanchez, M.
Hernando, B.
Zhukov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813592.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Jk
Opis:
Here, we present the study on the influence of the Ni content on the magnetization processes of the amorphous glass-coated $Fe_{77.5-x}Ni_xSi_{7.5}B_{15}$ (x = 0-40) microwires. Measurement of the amplitude dependence of the complex susceptibility was used to observe the magnetization process. It is shown that the magnetization process in the presented samples runs mainly through the domain wall motion.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 155-158
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Propertics of Fe/Zr Multilayers
Autorzy:
Szymański, B.
Stobiecki, F.
Powiązania:
https://bibliotekanauki.pl/articles/1930610.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.70.-i
Opis:
In this paper we report results of investigation into structure and magnetic properties of as-deposited Fe/Zr multilayers with different wavelength of modulation, λ, and thicknesses ratio of sublayers r = d$\text{}_{Fe}$/d$\text{}_{Zr}$. Three series of samples with r equal to 0.5, 1, 2 and λ from 12 nm to 1.2 nm were prepared by sputtering technique. The samples were studied by X-ray diffraction and torque curve measurements. It is shown that during deposition amorphization process takes place at interfaces. For nominal Fe sublayer thickness d$\text{}_{Fe}$ smaller than 2 nm the multilayers are found to be completely amorphous independently of r, and consist of alternating Fe-rich and Fe-poor amorphous sublayers.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 455-459
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pulsed Laser Deposition of Amorphous Co-Fe-Ni-Si-B Thin Films
Autorzy:
Gareev, R. R.
Alimpiev, S. S.
Bugoslavskii, Yu. V.
Nikiforov, S. M.
Maslov, A. I.
Shubnii, G. Yu.
Zherichin, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/1955481.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.70.Ak
Opis:
Soft magnetic multicomponent Co-Fe-Ni-Si-B thin films have been grown by pulsed laser deposition onto single-crystal sapphire and silicon substrates. The static hysteresis measurements for different substrate temperatures are presented. Thin films with a coercive force smaller than 1 Oe were grown at substrate temperatures from 250°C to 350°C. X-ray diffraction measurements proved that the structure of films is amorphous. The surface morphology of grown thin films was observed by scanning electron microscopy. The chemical composition of deposited films corresponds to the composition of bulk alloy.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 321-324
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Electric Transport Properties of Fe-Hf-o Films Prepared by Supersonic Plasma Jet Method
Autorzy:
Soyka, V.
Kraus, L.
Frait, Z.
Šícha, M.
Jastrabík, L.
Powiązania:
https://bibliotekanauki.pl/articles/2013152.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.70.Pa
Opis:
The influence of deposition conditions on the structure, magnetic properties, and electrical resistivity of Fe-Hf-O films, prepared by the supersonic plasma jet deposition technique, was investigated. Composition of the films was controlled by the nozzle composition and the working gas. It varied in the limits: 15-68 at.% of Fe, 0.5-8 at.% of Hf and 29-80 at.% of O. The films were mainly X-ray amorphous. Some of them showed a weak and broad peak near the [110] reflection of α-Fe indicating the presence of Fe-rich clusters in an amorphous matrix. Depending on the deposition parameters the magnetic properties vary from paramagnetic to ferromagnetic ones. The electrical resistivity changes from the metallic to the hopping type. In some samples a large negative magnetoresistance is observed.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 515-518
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Properties of Ni/Ti Multilayers
Autorzy:
Szymański, B.
Stobiecki, F.
Otto, T.
Röll, K.
Powiązania:
https://bibliotekanauki.pl/articles/1953189.pdf
Data publikacji:
1997-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.70.-i
Opis:
We report a study of structure and magnetic properties of Ni/Ti multilayers with different modulation wavelength, 10 nm ≤ λ ≤ 40 nm, and constant sublayers thickness ratio d$\text{}_{Ni}$/d$\text{}_{Ti}$=1. Specimens were characterized with X-ray diffraction, vibrating sample magnetometer and torque meter in as-deposited state and in successive stages of isothermal annealing at 423 K. Hysteresis curves of as-deposited samples revealed the typical feature of ferromagnetic films with predominant shape anisotropy. During annealing very pronounced changes in the hysteresis loops were observed. An analysis of the loops indicates the occurrence of distinct changes in magnetic anisotropy of Ni sublayers: their effective shape anisotropy is drastically reduced due to a development of the perpendicular anisotropy and/or a modification of the microstructure. The effect can possibly be applied to achieve desirable variation of perpendicular anisotropy in multilayers which consist of Ni sublayers.
Źródło:
Acta Physica Polonica A; 1997, 91, 1; 233-236
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current Annealings and Magnetoimpedance in Co-Fe Amorphous Ribbons
Autorzy:
González, J.
Domínguez, L.
Blanco, J. M.
Aragoneses, P.
Valenzuela, R.
Powiązania:
https://bibliotekanauki.pl/articles/1956111.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Nt
75.50.Kj
Opis:
Amorphous ribbons of composition (Co$\text{}_{0.95}$Fe$\text{}_{0.05}$)$\text{}_{100-x}$Si$\text{}_{0.4x}$ B$\text{}_{0.6x}$, with x=25 and 30 were prepared by the melt-spinning technique. Current annealings at 600 mA were performed for annealing times between 15 s and 60 min. The magnetoimpedance response was investigated by submitting the ribbons to ac currents at frequencies in the 10-200 kHz range, with amplitudes between 1 and 15 mA (rms), and measuring their voltage response. The observed results show that a transverse anisotropy is induced by the thermal treatments, which can be evaluated by means of the magnetoimpedance effect. Due to its lower Curie temperature, the x=30 ribbons exhibited lower sensibility to the current annealings.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 451-454
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferromagnetic Resonance in Fe/Zr Multilayers
Autorzy:
Dubowik, J.
Stobiecki, F.
Powiązania:
https://bibliotekanauki.pl/articles/1930609.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.70.-i
Opis:
We report our ferromagnetic resonance measurements for three series of Fe/Zr multilayers with thickness ratio of Fe to Zr sublayers equal to 2:1, 1:1, and 1:2, respectively. These measurements may serve as an example of employing ferromagnetic resonance technique as a sensitive probe for monitoring the magnetic phases formed at interfaces in the earliest stages of the interdiffusion reaction in multilayer Fe/Zr films for which the onset of the amorphization takes place during deposition due to thermodynamics of the system. The resulting structure may be regarded as strongly inhomogeneous one that includes distinct ferromagnetic phases related to the Fe atoms in various surroundings.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 449-453
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:
Gradually Devitrified Co-Based Metallic Glass As a Model Material for Testing Néels Theory of the Rayleigh Rule
Autorzy:
Lachowicz, H. K.
Popławski, F.
Kane, S. N.
Kuźmiński, M.
Kulik, T.
Powiązania:
https://bibliotekanauki.pl/articles/1995188.pdf
Data publikacji:
1999-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
Opis:
It is shown in the present paper that gradually devitrified Co-based non-magnetostrictive metallic glass is an excellent model material to verify Louis Néel's theory of the Rayleigh rule. In the course of the calculations, Néel showed that the parameter p=bH$\text{}_{c}$a (where H$\text{}_{c}$ is the coercivity, a and b are the coefficients of a quadratic polynomial expressing the Rayleigh rule) is expected to range between 0.6 (hard magnets) and 1.6 (soft). However, the experimental values of this parameter, reported in the literature for a number of mono- and poly-crystalline magnets, are much greater than those expected from the theory presented by Néel (in some cases even by two orders of magnitude). The measurements, performed for a series of Co-based metallic glass samples annealed at gradually increasing temperature to produce nanocrystalline structures with differentiated density and size of the crystallites, have shown that the calculated values of the parameter p fall within the range expected from Néel theory.
Źródło:
Acta Physica Polonica A; 1999, 95, 2; 287-296
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
Tytuł:
Generalization of Magnetostatic Method of Moments for Thin Layers with Regular Rectangular Grids
Autorzy:
Szewczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032670.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Ak
75.50.Kj
Opis:
Possibilities of the modeling of the flux density distribution in thin films are significantly limited using the finite elements method due to the fast increase of the number of tetrahedral elementary cells with reduction of the thickness. For this reason, method of the moments is very important alternative for finite elements method in the case of thin layers, where layer's thickness should be considered. Method of the moments overcomes this barrier, due to the possibility of operation on uniform grids with limited number of cells. Moreover, in opposite to the finite elements method, the method of the moments requires solving of the well defined linear equations, instead of the set of ill-posed differential equations. Paper presents the generalization of the method of the moments for thin layers with given thickness. Layers are defined as the 2D rectangular grids. Within the generalization, four key equations describing the influence of rectangular cell's border on the magnetization of cells are stated. On the base of these dependences, the set of 2NM linear equations was determined, where N and M are the numbers of rectangular cells in the rows and columns of regular grid. Finally, the set of linear equations is solved and magnetic flux density distribution in the thin layer is calculated.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 845-847
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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