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1
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Bulk and Epitaxial Co_2MnSi Systems with Antisite Disorder: Ab Initio Calculations

100%
Carva K., Turek I.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
183-186
EN
The intermetallic compound Co_2MnSi is halfmetallic, but the structure of real samples is often affected by antisite disorder. The influence of disorder on transport properties is examined by ab initio calculations and is found to be more significant in thin Co_2MnSi slabs sandwiched by metallic leads than in the bulk compound.
2
Content available remote

Transmission and Reflectionof Spin-Polarized Electrons Propagating through a Model Domain Wall

100%
Sýkora R., Turek I.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
15-18
EN
An analytically tractable simple model of a magnetic domain wall in a ferromagnetic metal is considered and, assuming the ballistic regime of electronic transport, transmission and reflection coefficients of such a wall are calculated within the stationary scattering theory. It is rederived that for realistic values of electron energies and domain wall widths the transmission coefficient is very close to one and thus an ideal domain wall itself (i.e. not taking into account other aspects such as disorder) does not essentially represent a hindrance to the transport.
3
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Spin-Mixing Conductances of Ni-Based Films Attached to Cu(100) Leads

100%
Turek I., Carva K.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
11-14
EN
The complex spin-mixing conductance of epitaxial Cu/Ni/Cu(100) systems is predicted to oscillate as a function of Ni thickness. The oscillation period is explained in terms of spin-resolved Fermi surface properties of bulk nickel. Stability of the oscillations with respect to interface Cu-Ni interdiffusion and to alloying in the Ni film is investigated as well.
4
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Correlated Doping in Semiconductors: the Role of Donors in III-V Diluted Magnetic Semiconductors

71%
Mašek J., Turek I., Drchal V., Kudrnovský J., Máca F.
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issue 4-5
673-678
EN
We investigate the compositional dependence of the total energy of the mixed crystals (Ga,Mn)As co-doped with As, Sn, and Zn. Using the ab initio linear muffin-tin orbital coherent potential approximation method we find a correlation between the incorporation of acceptors (Mn, Zn) and donors (Sn, antisite As). In particular, the formation energy of As_{Ga} is reduced by approximately 0.1 eV in the presence of Mn, and vice versa. This leads to the self-compensating behavior of (Ga,Mn)As.
5
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Interlayer Exchange Coupling: Effect of Alloying

71%
Kudrnovský J., Drchal V., Turek I., Šob M., Weinberger P.
Acta Physica Polonica A
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1997
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vol. 91
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issue 1
15-25
EN
The effect of disorder in magnetic layers, in the spacer, and at interfaces between them on periods, amplitudes, and phases of oscillations of interlayer exchange coupling in magnetic multilayers is studied theoretically on the ab initio level. We employ the spin-polarized surface Green function technique within the tight-binding linear muffin-tin orbital method and the Lloyd formulation of the interlayer exchange coupling. The coherent potential approximation is used to describe the effect of alloying. The calculations are significantly simplified by employing the vertex-cancellation theorem. Numerical results illustrating the effect of various kinds of disorder in the system on the properties of the interlayer exchange coupling are presented.
6
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Compositional Dependence of the Formation Energies of Substitutional and Interstitial Mn in Partially Compensated (Ga,Mn)As

71%
Mašek J., Turek I., Kudrnovský J., Máca F., Drchal V.
Acta Physica Polonica A
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2004
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vol. 105
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issue 6
637-644
EN
We use the density-functional theory to calculate the total energy of mixed crystals (Ga,Mn)As with a small concentration of various donors. We find that the formation energy of Mn depends strongly on the partial concentrations of Mn in the substitutional and interstitial positions, and on the concentration of other dopants. The composition dependence of the formation energies represents an effective feedback mechanism, resulting in the self-compensation property of (Ga,Mn)As. We show that the partial concentrations of both substitutional and interstitial Mn increase proportionally to the total concentration of Mn.
7
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The Dynamics of the Soret Effect in Thin Film of Magnetic Fluid

52%
Kopčanský P., Tomčo L., Timko M., Ocelík V., Koneracká M., Turek I., Štelina J., Musil C.
Acta Physica Polonica A
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2000
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vol. 97
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issue 5
875-878
EN
The Soret effect in interference field of two intensive laser beams in the thin film of magnetic fluid was used to create a periodical structure of density of magnetic particles. The structures obtained were indicated using the self-diffraction of the optical beam creating the structures. The relaxation phenomena after switching off the laser interference field were discussed in terms of the spectrum of relaxation times. This spectrum is proportional to hydrodynamic particle size distribution. The relaxation of optical grating consists of two well-defined channels, i.e. decay through single particles and small aggregates, respectively.
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