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  1. 4 Acta Physica Polonica A

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  1. 3 2000

  2. 1 1997

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  1. 4 Schmidt W.

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1
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Exchange Coupling of Magnetic Multilayers in Spin-Polarized Jellium

100%
Schmidt W.
Acta Physica Polonica A
|
1997
|
vol. 91
|
issue 2
265-268
EN
The bilinear and biquadratic coupling between two metallic layers separated by a nonmagnetic metal spacer are studied. The paper contains analytical formulae for the coupling which are obtained from the energy potential of the spin-polarized electron gas. The formulae for the coupling are obtained in the framework of the Hohenberg-Kohn formalism of the density functional theory and variables of the coupling are the electron density and the spin polarization of the magnetic multilayer.
2
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The Spin-Wave Stiffness within Density Functional Theory and the Ginzburg-Landau Functional

100%
Schmidt W.
Acta Physica Polonica A
|
2000
|
vol. 98
|
issue 5
625-628
EN
The stiffness constant of the stationary spin excitation is calculated employing density functional theory and the phenomenological Ginzburg-Landau energy functional in a site form. The exchange parameter of the magnetic functional is estimated within the framework of the nearest neighbours intermolecular interaction and the energy gain of non-magnetic state per atom. The stiffness constant of Fe, Co, and Ni metals is found based on the energies of spin polarization calculated numerically in the local spin density approximation by Moruzzi et al. as well as by Kübler. The calculated stiffness constants are compared with other theoretical calculations and experimental data.
3
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Exchange Stiffness Parameter and Magnetization in Pseudopotential Calculations

100%
Schmidt W.
Acta Physica Polonica A
|
2000
|
vol. 97
|
issue 5
967-970
EN
We study low temperature magnetic properties of transition metals. The ground state spontaneous magnetization is calculated in a pseudopotential approximation. In the calculations, the core electronic orbitals are approximated by asymptotic expressions. The magnetizations are calculated for uniform spin densities of valence (chemically active) electrons and in the Lindhard approximation. Our calculations of the Bloch wall parameter and the magnon stiffness constant are based on a study of ferromagnetic and paramagnetic phases. A simple Bragg-Williams approximation between energy of spin polarization and the time-average of the spin moment per atom determines the "exchange coupling" (Heisenberg-like) for spin-polarized nearest neighbour Wigner-Seitz cells. Ab initio numerical results of the spontaneous magnetization, the Bloch wall parameter, and the magnon stiffness constant are obtained for Fe, Co, and Ni.
4
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ERRATUM: W. Schmidt, Exchange Stiffness Parameter and Magnetization in Pseudopotential Calculations, Acta Phys. Pol. A 97, 967 (2000).

63%
Schmidt W.
Acta Physica Polonica A
|
2000
|
vol. 98
|
issue 1-2
163
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