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    Wyświetlanie 1-14 z 14
    Tytuł:
    Spin Resistivity in Magnetic Materials
    Autorzy:
    Diep, H.
    Magnin, Y.
    Hoang, Danh-Tai
    Powiązania:
    https://bibliotekanauki.pl/articles/1426671.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.76.+j
    05.60.Cd
    Opis:
    We show in this paper recent results on the spin resistivity in magnetically ordered materials obtained by Monte Carlo simulations. We discuss its behavior as a function of temperature in various types of crystal: ferromagnetic, antiferromagnetic, and frustrated spin systems. In the model used for simulations, we take into account the interaction between itinerant spins and that between lattice spins and itinerant spins. We also include a chemical potential term, as well as an electric field. We study in particular the behavior of the spin resistivity at and near the magnetic phase transition where the effect of the magnetic ordering is strongest. In ferromagnetic crystals, the spin resistivity shows a sharp peak very similar to the magnetic susceptibility. This can be understood if one relates the spin resistivity to the spin-spin correlation as suggested in a number of theories. The dependence of the shape of the peak on physical parameters such as carrier concentration, magnetic field strength, relaxation time etc. is discussed. In antiferromagnets, the peak is not so pronounced and in some cases it is absent. Its direct relationship to the spin-spin correlation is not obvious. As for frustrated spin systems with strong first-order transition, the spin resistivity shows a discontinuity at the phase transition. To show the efficiency of the simulation method, we compare our results with recent experimental data performed on semiconducting MnTe of NiAs structure. We observe a very good agreement with experiments on the spin resistivity in the whole range of temperature.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 985-991
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Spin Pumping on Spin Waves in Antiferromagnetically Exchange-Coupled Double Layers with Surface Anisotropy
    Autorzy:
    Baláž, P.
    Barnaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402556.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Gb
    75.76.+j
    75.78.-n
    Opis:
    Spin wave modes in antiferromagnetically exchange-coupled magnetic double layers are analyzed theoretically. The considered structure is assumed to be covered by a nonmagnetic metallic layer. The spin wave frequencies and spin wave life times are determined from the macroscopic description based on the Landau-Lifshitz-Gilbert equation, which includes the torque due to spin pumping to the cap layer.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2; 150-152
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelectric generation based on Spin Seebeck effect in NiFeCuMo alloy
    Autorzy:
    Guzowski, B.
    Gozdur, R.
    Lakomski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1047662.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.76.+j
    85.80.Fi
    72.15.Jf
    Opis:
    An overview of the achieved Inverse Spin Hall Effect voltage (V_{ISHE}) is presented to find upper limit of this V_{ISHE}. Comprehensive review confirms that the most significant spin systems are based on YIG substrate. The Pt ISHE interfaces are the most popular, however, the best result was reported for the Ir₂₀Mn₈₀ ISHE interface. Moreover, in this paper the transvers spin Seebeck effect (SSE) is measured in bulk sample of Ni_{76.1}Fe_{15.9}Cu_{4.3}Mo_{3.6} with Pt interface. The max. measured value of V_{ISHE} for NiFeCuMo alloy with Pt is 0.493 μV with ΔT= 21.5 K.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 541-543
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge and Spin Transport in a Metal-Semiconductor Heterostructure with Double Schottky Barriers
    Autorzy:
    Wolski, S.
    Jasiukiewicz, C.
    Dugaev, V.
    Barnaś, J.
    Slobodskyy, T.
    Hansen, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386690.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.30.+y
    73.40.-c
    75.76.+j
    Opis:
    Taking into account the available experimental results, we model the electronic properties and current-voltage characteristics of a ferromagnet-semiconductor junction. The Fe/GaAs interface is considered as a Fe/(i-GaAs)/n⁺-GaAs/n-GaAs multilayer structure with the Schottky barrier. We also calculate numerically the current-voltage characteristics of a double-Schottky-barrier structure Fe/GaAs/Fe, which are in agreement with available experimental data. For this structure, we have estimated the spin current in the GaAs layer, which characterizes spin injection from the ferromagnet to the semiconductor.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 472-474
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin-Polarized and Normal Hopping Magnetoresistance in Heavily Doped Silicon
    Autorzy:
    Fedotov, A.
    Prischepa, S.
    Danilyuk, A.
    Svito, I.
    Zukowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1365745.pdf
    Data publikacji:
    2014-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.uf
    72.20.My
    75.76.+j
    Opis:
    Investigation of electrical resistivity ρ and magnetoresistance in single crystalline n-type silicon heavily doped with antimony in the temperature range ΔT=5-300 K and at the magnetic inductance B up to 8 T was performed. It was established that, for the temperature range ΔT=25-300 K the conductivity is of activation type, while for ΔT=5-25 K it is of variable range hopping and is described by the Mott law. Parameters of the Mott hopping were calculated. It was shown that, to explain the experimental data, the spin polarized hopping via the occupied states has to be taken into account. The obtained parameters revealed that for the low temperature range ΔT=5-11 K the spin polarized hopping dominates, while for ΔT=11-20 K the spin polarized transport is accompanied by the wave function contraction.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 6; 1271-1274
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The investigation of spin Seebeck effect in Co₇₉Si₁₀X alloys
    Autorzy:
    Bernacki, Ł.
    Gozdur, R.
    Pawlak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054822.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.80.Fi
    72.15.Jf
    75.76.+j
    Opis:
    The paper presents experimental study of the spin Seebeck effect based on the widely used ferromagnetic Co₇₉Si₁₀X layer, partially covered with Pt layer. The total thickness of tested sample is about 20 μm, which makes it the first confirmed presence of the spin Seebeck effect in bulk material. Experiment was carried out under magnetic flux density 300 mT, room temperature and for constant temperature difference across the sample ranging from 1 K to 21 K. The measured value of induced voltage drop achieved 0.5 μV per 1 K.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 872-874
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Results on the Density of Electronic States, Superexchange Interaction, and Electrical Conduction in Transition-Metal Salts
    Autorzy:
    Grado-Caffaro, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401901.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    75.20.En
    75.50.-y
    75.76.+j
    Opis:
    We investigate several issues related to the electronic states in the ligand orbital of a given transition-metal salt as, for example, a K₂CuCl₄·2H₂O-type compound. In fact, to get our calculation, we start from an expression for the electronic density of states in a compound of the above type. In addition, various aspects related to superexchange interaction in both the paramagnetic and ferromagnetic cases are discussed and the electronic conduction process in the ligand orbital is studied.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 394-397
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oblique Reflection of Electrons from a Potential Barrier in Heterostructures
    Autorzy:
    Pfeffer, P.
    Zawadzki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205321.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.70.Ej
    73.22.Dj
    73.40.-c
    75.76.+j
    Opis:
    Reflection of electrons from a potential barrier in heterostructures is described. An electric field of the barrier causes spin splitting of electron energies via the spin-orbit interaction and its form is calculated in the three-level $k·p$ model for a nontrivial case of unbound electrons. It is shown that if the potential barrier is the only source of the spin-orbit interaction, the spin-flip electron reflections are not possible. However, there appear two unexpected possibilities related to the spin-orbit interaction: (a) non-attenuated electron propagation in the barrier whose height exceeds the energies of incoming electrons, (b) total reflection of electrons whose energies exceed barrier's height. It is indicated that the system can serve as a source of spin-polarized electron beams.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 820-826
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Carbon on Spin Reorientation Processes in $Er_{2-x}R_xFe_{14}C$ (R~=~Gd, Pr) - Mössbauer and Magnetometric Studies
    Autorzy:
    Pędziwiatr, A.
    Krawiec, K.
    Bogacz, B.
    Kapusta, Cz.
    Przewoźnik, J.
    Kaczorowski, D.
    Talik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506592.pdf
    Data publikacji:
    2011-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.25.-j
    75.50.-y
    75.50.Bb
    Opis:
    The $Er_{2-x}R_{x}Fe_{14}C$ (R=Gd, Pr) polycrystalline compounds have been synthesized and investigated with $\text{}^{57}Fe$ Mössbauer spectroscopy and magnetic measurements. The spin reorientation phenomena were studied extensively by narrow step temperature scanning in the neighborhood of the spin reorientation temperature. Obtained Mössbauer spectra were analyzed using a procedure of simultaneous fitting and the transmission integral approach. Consistent description of Mössbauer spectra were obtained, temperature and composition dependencies of hyperfine interaction parameters and subspectra contributions were derived from fits and the transition temperatures were determined for all the compounds studied. Initial magnetization versus temperature measurements (in zero and non-zero external field) for $Er_{2-x}Gd_{x}Fe_{14}C$ compounds allowed to establish the temperature regions of reorientation, change of magnetization value during the transition process. The results obtained with different methods were analyzed and the spin arrangement diagrams were constructed. Data obtained for $Er_{2-x}Gd_{x}Fe_{14}C$ were compared with those for $Er_{2-x}Gd_{x}Fe_{14}B$ series.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 1; 48-51
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Point Defects in the B2-Phase Region of the Fe-Al System by Mössbauer Spectroscopy
    Autorzy:
    Hanc, A.
    Kansy, J.
    Dercz, G.
    Pająk, L.
    Oleszak, D.
    Mrzigod, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811589.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    61.72.J-
    76.80.+y
    Opis:
    In this work, we employed the Mössbauer spectroscopy and X-ray powder diffraction in a study of point defect formation in intermetallic phases of the B2 structure of the Fe-Al system as a function of Al concentration. The results are compared with the concentrations of point defect determined from positron annihilation data. In the Mössbauer effect, two types of samples are investigated: Fe-Al alloys with few additives obtained by induction melting and Al-rich metallic powders produced by the self-decomposition method and intensive grinding of high energy in the electro-magneto-mechanical mill. We present the values of the $\text{}^{57}Fe$ isomer shift and quadrupole splitting for the components describing the point defect in the local environment of a Mössbauer nuclide. The concentration of the Fe vacancies and Fe atoms substituting Al (Fe-AS) are determined. The results showed that an increase in Al content causes an increase in vacancy and Fe-AS concentration.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1555-1562
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulations of Noise-Free Stochastic Resonance in Spin-Wave Chaos
    Autorzy:
    Krawiecki, A.
    Reibold, E.
    Benner, H.
    Sukiennicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013991.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.50.+g
    75.30.Ds
    05.45.+b
    05.40.+j
    Opis:
    Numerical simulations of noise-free stochastic resonance and aperiodic stochastic resonance in chaotic ferromagnetic resonance are presented. The model, based on three-magnon interactions between the externally excited uniform mode and pairs of spin waves, shows on-off intermittency. The rf magnetic field amplitude is slowly modulated by a small periodic or aperiodic signal, and the output signal, which reflects the occurrence of laminar phases and bursts in the time series of spin-wave amplitudes, is analyzed. On variation of the dc magnetic field the signal-to-noise ratio of the output signal and the correlation function between modulation and output signal pass a maximum, which indicates the occurrence of periodic and aperiodic stochastic resonance, respectively. The role of thermal magnon excitations in the occurrence of this maximum is clarified. The results are compared with experimental findings obtained in other types of intermittency.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 975-978
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal structure and EPR investigation of pyrazinamide containing copper (II) 2-nitrobenzoate single crystal
    Autorzy:
    Çelik, Y.
    Bozkurt, E.
    Karabulut, B.
    Dege, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070369.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    75.10.Dg
    76.30.-v
    78.30.-j
    Opis:
    The crystal structure and paramagnetism in the pyrazinamide containing copper(II) 2-nitrobenzoate single crystal were investigated using X-ray diffraction, Fourier-transform infrared spectroscopy, and electron paramagnetic resonance techniques. X-ray diffraction analysis shows that the complex crystallizes in monoclinic system having two molecules in the unit cell. After using curve fitting method to the electron paramagnetic resonance spectra, anisotropic g and hyperfine A tensors were obtained. The local symmetry, spin Hamiltonian parameters, and molecular bonding coefficients of the paramagnetic Cu²⁺ ion were determined. Perturbation approach was applied to the spin Hamiltonian to calculate the g and A values.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 163-166
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Effect of Boron Concentration on Magnetic and Structural Properties of $Nd_{7.5}Pr_{2.5}Fe_{90-x}B_x$ Melt-Spun Alloys
    Autorzy:
    Siddique, M.
    Ahmad, I.
    Kanwal, M.
    Ahmed, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401887.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    75.50.-y
    61.43.-j
    61.05.C-
    Opis:
    The Mössbauer spectroscopy and X-ray diffraction techniques have been used to investigate the effect of boron concentration on the structural and magnetic properties of as-quenched and heat-treated melt-spun alloys $Nd_{7.5}Pr_{2.5}Fe_{90-x}B_x$ (x=6, 8, 10) produced by melt-spinning technique. X-ray diffraction and Mössbauer spectroscopy results indicate that as-prepared samples are completely amorphous in nature. The X-ray diffraction patterns of samples heat-treated at 700°C are indexed as $Fe_{3}B,$ $\alpha-Fe,$ $(NdPr)_{2}Fe_{14}B$ and $Fe_{23}B_{6}$ phases. The Mössbauer spectra of heat-treated samples are very complex and constituted a number of sextets and a quadrupole doublet. Two main phases are $(NdPr)_{2}Fe_{14}B$ hard and $t-Fe_{3}B$ soft magnetic phases while $\alpha-Fe$ and $Nd_{23}Fe_{6}$ are detected as minor phases. The average internal magnetic field decreases with the increase of boron content; more sharply in as-prepared and comparatively slowly in heat-treated samples. The X-ray diffraction and Mössbauer spectroscopy results are in good agreement with each other.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 353-357
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of 1% Addition of Nb and W on the Relaxation Process in Classical Fe-Based Amorphous Alloys
    Autorzy:
    Pietrusiewicz, P.
    Błoch, K.
    Nabiałek, M.
    Walters, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385746.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.Lr
    75.50.-y
    75.50.Kj
    75.30.Cr
    61.43.Dq
    76.80.+y
    61.05.Qr
    75.25.-j
    Opis:
    This paper features investigations into the influence of small additions of alloying elements on: structure, as well as the temporal and thermal stability of magnetic properties, and the disaccommodation effect, for the following amorphous alloys: Fe₆₁Co₁₀Y₈Me₁B₂₀ (where Me = Nb, W). The structure of the investigated samples has been confirmed by the Mössbauer spectroscopy. The obtained results indicate a strong correlation between the structure and the disaccommodation of the studied alloys. The Mössbauer studies reveal different configurations of atoms in the amorphous alloy samples, and the results indicate various potential barriers between orientations of atom pairs. For this reason, to describe the disaccommodation effect, the distribution of activation energy should be taken into account. The distribution of activation energy has been related to the distribution of relaxation times.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 397-399
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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