Temat: 75.50.Cc - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Magnetic Behaviour of U$\text{}_{1-x}$Dy$\text{}_{x}$Ni$\text{}_{5}$ Systems
Autorzy:: Lucaci, P.
Lupsa, I.
Burzo, E.
Tematy:: 75.50.Cc
75.20.En; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1946264.pdf Link otwiera się w nowym oknie
Opis:: The magnetic properties of (U$\text{}_{1-x}$Dy$\text{}_{x}$)Ni$\text{}_{5}$ compounds were studied in the temperature range 2-800 K and fields up to 7 T. The compounds having x ≥ 0.2 are magnetically ordered. Above the Curie points, the reciprocal susceptibilities follow a modified Curie-Weiss behaviour. UNi$\text{}_{5}$ is a paramagnet. A peak in the temperature dependence of the magnetic susceptibility is evidenced at T ≈ 20 K. For T > 140 K the UNi$\text{}_{5}$ susceptibility is temperature independent.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Structural and Magnetic Characterization of NiMnSb Half-Heusler Alloy Prepared by Rapid Quenching
Autorzy:: Ryba, T.
Vargova, Z.
Varga, R.
Ilkovic, S.
Reiffers, M.
Haskova, V.
Szabo, P.
Kravcak, J.
Gyepes, R.
Tematy:: 75.30.Gw
75.50.Cc; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1368037.pdf Link otwiera się w nowym oknie
Opis:: NiMnSb half-Heusler alloy in the form of a rod has been prepared by rapid quenching (suction-casting) method. The rod is characterized by single phase $C1_b$ crystalline structure with lattice parameter a=5.982 Å. Magnetic measurements reveal an isotropic character of bulk NiMnSb alloy. Our study shows relatively high spin polarization of bulk NiMnSb in the range 35-50%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: X-ray Reflectivity and Polarized Neutron Reflectivity Investigations of $[Co_{60}Fe_{60}B_{20}//MgO]_n$ Multilayers
Autorzy:: Vadalà, M.
Wolff, M.
Westerholt, K.
Zabel, H.
Wisniowski, P.
Cardoso, S.
Tematy:: 75.50.-i
75.50.Kj
75.50.Cc; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1814030.pdf Link otwiera się w nowym oknie
Opis:: In recent years magnetic tunnel junctions have been intensively studied and incorporated in magnetic random access memory devices and magnetic sensors, where large tunnelling magnetoresistance ratios are preferred. The largest tunnelling magnetoresistance values until now have been observed in magnetic tunnel junctions with MgO barriers and CoFeB electrodes after annealing of the junction above the recrystallization temperature of the amorphous CoFeB layers. We used X-ray reflectivity and polarized neutron reflectivity to study [Co_{60}Fe_{60}B_ {20}//MgO]_{x14} multilayers with the MgO layers prepared by different methods and annealed at different temperatures in order to compare the interface quality and the structural changes induced upon annealing.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Magnetoelastic Phase Transitions and Critical Behaviour of (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P System
Autorzy:: Średniawa, B.
Duraj, R.
Pacyna, A.
Bombik, A.
Zach, R.
Bacmann, M.
Fruchart, D.
Nizioł, S.
Fornal, P.
Stanek, J.
Tematy:: 75.50.Cc
71.20.Lp; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2013735.pdf Link otwiera się w nowym oknie
Opis:: This report focuses on magnetoelastic properties and critical behaviour of (Fe$\text{}_{1-x}$Ni$\text{}_{x}$)$\text{}_{2}$P system. For low Ni content (x=0.01) an isolated critical point was found. Analysis of this critical behaviour in the frame of molecular field approximation was carried out. Moreover, thermal variations of the lattice parameters, as measured by X-ray diffraction techniques, were studied. The (P,T) phase diagrams obtained for several Ni contents show the evidence that the Curie temperature decreases with pressure. The Mössbauer spectra collected for x = 0.025, 0.1, 0.2, 0.25 at different temperatures are also analysed. The existence of two nonequivalent crystallographic sites occupied by iron atoms as well as local magnetic structure is discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Investigation on Magnetic Properties of Soft/Hard Magnetic Bilayers at Different Temperatures: a Monte-Carlo Study
Autorzy:: Değer, C.
Aköz, M.
Erkovan, M.
Yıldız, F.
Tematy:: 75.50.Cc
21.60.Ka; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1191754.pdf Link otwiera się w nowym oknie
Opis:: Soft/hard magnetic bilayers are attractive systems for investigating their physical behavior due to scientific curiosity and the potential for technological applications. Thus, 10 nm thick hard magnetic layer placed on a 20 nm soft magnetic layer was modeled in this work. After the constructing of magnetic thin films, the bilayer structure was simulated based on micro-magnetic modeling. When constructing the Hamiltonian of the system, magnetocrystalline anisotropy term was also under debate with classical Zeeman and exchange terms. Energy minimization in the simulation was performed using Metropolis algorithm and Markov Chain Monte Carlo (MC-MC) method. As a result of modeling, hysteresis curves, remanent magnetization and coercive fields were obtained at different temperatures.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Electromagnetic Waves Generation in $Ni_{2.14}Mn_{0.81}GaFe_{0.05}$ Heusler Alloy at Structural Phase Transition
Autorzy:: Bychkov, I.
Kuzmin, D.
Kalenov, D.
Kamantsev, A.
Koledov, V.
Kuchin, D.
Shavrov, V.
Tematy:: 64.60.-i
75.50.Cc; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1387405.pdf Link otwiera się w nowym oknie
Opis:: Electromagnetic waves generated by the Heusler alloy $Ni_{2.14}Mn_{0.81}GaFe_{0.05}$ at structural phase transition was detected in the frequency range of 28-32 GHz. Influence of the kinetics of phase transitions on the nature of the sample millimeter radiation was studied as well. It has been observed that the contribution of the intrinsic radiation increases with increasing of the heating/cooling rate. The possible mechanisms and theory of such effect is discussed. It is shown that the maximum radiation intensity should be emitted in direction perpendicular to the movement of interphase boundary.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Average Magnetization and Fe Hyperfine Fields in Co₂FeSi-based Heusler Alloys
Autorzy:: Kiss, L.
Bortel, G.
Bujdosó, L.
Kaptás, D.
Kemény, T.
Vincze, I.
Tematy:: 75.50.Cc
76.80.+y; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1385600.pdf Link otwiera się w nowym oknie
Opis:: In the present study SQUID magnetic and $\text{}^{57}Fe$ Mössbauer measurements were performed on bulk $Co₂FeAl_{1-x}Siₓ$, $Co₂Fe_{0.9}TM_{0.1}Si$ (TM = Ti, V, Cr, Mn, Co, Ni, Cu), $Co_{2-y}Fe_{1+y}Si$ and $Co₂Fe_{1+z}Si_{1-z}$ samples prepared by induction melting. The $Co₂FeAl_{1-x}Siₓ$ shows the L2₁ crystal structure only for x ≥ 0.5, between x = 0 and 0.3 it has the B2 structure (Fe-Al, Si disorder). The average magnetization of these alloys does not follow the expected Slater-Pauling trend (on the Si side saturation is observed around 5.75 $μ_{B}$/f.u.) and similar deviation is observed for the replacement of Fe by transition metal (TM) atom. The effect of the antisite disorder (Fe-Si) on the magnetization and Fe hyperfine parameters was determined and significant decrease in the Co magnetic moment for excess Si neighbourhood is extrapolated. The formerly reported large ≈ 6 $μ_{B}$/f.u. magnetization for Co₂FeSi was observed only in samples having Fe excess and Si deficiency.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The Influence of Annealing Temperature on Magnetic Properties of Vitrovac 6030
Autorzy:: Lachowicz, H. K.
Popławski, F.
Żuberek, R.
Kulik, T.
Ślawska-Waniewska, A.
Kuźmiński, M.
Yu, S. C.
Dynowska, E.
Tematy:: 75.50.Cc
75.50.Kj
75.60.Ch; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2011100.pdf Link otwiera się w nowym oknie
Opis:: Co-Fe-Mo-Mn-Si-B metallic glass ribbon (Vitrovac 6030) was subjected to the isothermal annealing at temperatures in the range 523-873 K so as to produce a series of samples with gradually coarser microstructure. For this series of samples a giant increase in the coercivity, exceeding three orders of magnitude, is observed. This increase is interpreted in terms of the strengthening of the pinning effect of the nanocrystalline structure on the moving domain walls. It is shown that the anisotropy of the created crystallites is mainly responsible for the increase in the pinning force since the effective anisotropy seen by the wall becomes larger and larger with the gradual increase in the density and size of the grown particles.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Physical properties study of the CeOsGa₄ compound
Autorzy:: Sondezi, B.
Strydom, A.
Tematy:: 75.50.Ee
75.50.Cc
75.40.-s; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1047645.pdf Link otwiera się w nowym oknie
Opis:: A polycrystalline sample of CeOsGa₄ was prepared by arc-melting stoichiometric quantities of high purity elements of 4N and greater, in an arc furnace. The data was confirmed to crystallize in an orthorhombic structure, with a space group Pmma (Number 51). Measurements of the magnetic susceptibility showed a distinct anomaly around T_{o} = 3.8 K, while the high temperature data (above 100 K) obeys Curie-Weiss law. The calculated effective moment of 2.44 μ_{B}, was obtained, which was a bit less than the theoretical moment for a Ce³⁺ ion of 2.54 μ_{B}. Magnetization data at T=2 K depicts that CeOsGa₄ does not saturate up to applied magnetic field of 7 T, while the data measured at 9 K indicates that the compound is purely paramagnetic at that temperature. The low temperature specific heat data is characterized by an anomaly at T_{o} = 3.8 K confirming the χ(T) data. Electrical resistivity shows a metallic behaviour at high temperatures with a deviation at low temperatures, signalling the cooperative behaviour which results to ordering. In this work we present the initial studies of the physical properties measurements performed on this compound.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: FMR Study of Co/Ti Bilayer Thin Films
Autorzy:: Erkovan, M.
Tokdemir Öztürk, S.
Taşkın Gazioğlu, D.
Topkaya, R.
Öztürk, O.
Tematy:: 75.70.Cn
75.50.Cc
76.50.+g; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1312088.pdf Link otwiera się w nowym oknie
Opis:: We focused on the interaction between two ferromagnetic cobalt layers through a non-magnetic titanium layer. The magnetic properties of the structure were characterized by ferromagnetic resonance technique. The data were collected as a function of non-magnetic titanium layer thickness. Co/Ti multilayer (Ti(50 Å)/Co(45 Å)/Ti(2-40 Å)/Co(40 Å)/Ti(100 Å)) films were grown onto naturally oxidized p-type single crystal Si (100) substrate at UHV condition with magnetron sputtering system at room temperature. The thickness of Ti spacer layer ranges from 2 to 40 Å with 2 Å steps. We did not observe usual optic and acoustic modes; instead we had two broad overlapped peaks for the films ranged from 6 Å to 40 Å. One interesting result was the high anisotropic resonance field values for these films. Exchange coupling between ferromagnetic layers causes shift on resonance field values but these shifts in our samples were much larger than expected. This large anisotropic behavior is not clear at the moment. Our theoretical model was not able to determine a value for the exchange coupling parameter. One reason can be the close thickness values for Co sublayers. The other reason can be the Ti non-magnetic layer. If titanium did not grow layer by layer on cobalt, the cobalt ferromagnetic layers may behave as a single layer. As a result one cannot observe exchange interaction between ferromagnetic layers through non-magnetic spacer.
Dostawca treści:: Biblioteka Nauki

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