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    Wyświetlanie 1-3 z 3
    Tytuł:
    Effect of Rashba Spin-Orbit Coupling on the Spin Polarization of Holes in Two-Dimensional GaMnAs Magnetic Semiconductors
    Autorzy:
    Stagraczyński, S.
    Dugaev, V.
    Berakdar, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032428.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    Magnetization
    Rashba spin-orbit coupling
    Opis:
    We consider the effect of the Rashba spin-orbital coupling in two-dimensional GaAs semiconductor heavily doped with Mn, on the spin polarization of holes. Due to the strong internal spin-orbit interaction in GaAs, the spin of a hole is not a good quantum number but the hole in some energy state has a certain mean value of spin, which can be strongly affected by the Rashba spin-orbital interaction related to the substrate for 2D material.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 189-192
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First-Principles Study of the Structural, Electronic, Magnetic and Thermal Properties of the Cr Doped Ge₆Mn₂Te₈ and Ge₆Fe₂Te₈ Systems
    Autorzy:
    Semari, F.
    Baki, N.
    Khachai, H.
    Yakoubi, A.
    Méçabih, S.
    Khenata, R.
    Shankar, A.
    Rai, D.
    Bouhemadou, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030079.pdf
    Data publikacji:
    2017-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    first-principles calculations
    half-metallic ferromagnetism
    electronic properties
    magnetic moment
    spin-exchange splitting
    thermodynamic properties
    Opis:
    First-principles calculations have been used to study the structural, electronic, magnetic, and thermal properties of the Cr doped Ge₆Mn₂Te₈ and Ge₆Fe₂Te₈ systems. The calculations were performed using the full-potential linearized augmented plane wave plus local orbitals (FP-LAPW + LO) method based on the spin-polarized density functional theory. Additionally, the electronic exchange-correlation potential is approximated using the spin generalized gradient approximation. The structural properties of the Ge₅Mn₂CrTe₈ and Ge₅Fe₂CrTe₈ alloys are indicated by their corresponding lattice constants, values of the bulk moduli and their pressure derivatives. An analysis of the band structures and the densities of states indicate that for both alloys, they present nearly half-metallic ferromagnetism character. The band structure calculations are used to estimate the spin-polarized splitting energies, Δp_{x}(d) and Δp_{x}(pd) produced by the 3d Mn, 3d Fe and 3d Cr doped states as well as the s(p)-d exchange constants, N₀α (conduction band) and N₀β (valence band). It is observed that the p-d hybridization reduces the magnetic moment of the Mn and Fe atoms from their atomic charge values and create small local magnetic moments on the nonmagnetic Ge and Te sites. Furthermore, the calculations of the charge density indicate that both compounds have ionic bonding character. Through the quasi-harmonic Debye model, the effects of pressure P and temperature T on the bulk modulus B, the primitive cell volume V/V₀, the Debye temperature θ_{D}, the Grüneisen parameter γ, the heat capacity C_{V}, the entropy S, as well as the thermal expansion coefficient, α of the Ge₆Mn₂Te₈, Ge₅Mn₂CrTe₈, Ge₆Fe₂Te₈ and Ge₅Fe₂CrTe₈ alloys are predicted.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 4; 1242-1250
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, characterization and magnetotransport behavior of La-based double layered manganites
    Autorzy:
    Reddy, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054876.pdf
    Data publikacji:
    2017-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    double layered manganites
    electrical transport
    magnetoresistance
    variable range hopping
    spin-glass-like behavior
    magnon scattering
    Opis:
    The single phase double layered manganites La_{1.2}Sr_{1.8-x}Ca_xMn₂O₇ (x=0.0, 0.3) were synthesized by the sol-gel method. The electrical resistivity at various magnetic fields over a temperature range 4.2-300 K was measured. The insulator-to-metal transition temperature (T_{IM}) decreases from 123 K (x=0.0) to 70 K (x=0.3). The spin-glass (SG)-like transition is observed in both the samples at 30 K (T_{SG} - SG-like transition temperature). The transport behavior is analyzed in the entire temperature range (4.2-300 K) in three different regions: paramagnetic insulating region (T>T_{IM}), ferromagnetic metallic region (T_{SG}T_{IM} in the two samples. At T_{SG}
    Źródło:
    Acta Physica Polonica A; 2017, 131, 6; 1544-1549
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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