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1
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Ising Model of Thin Film with Random Surface Field

100%
Onyszkiewicz Z.
Acta Physica Polonica A
|
1991
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vol. 80
|
issue 5
699-706
EN
Thermodynamical properties of an Ising model of a ferromagnetic thin film deposited onto a ferromagnetic substrate of rough surface contacting the thin film were studied. The influence of the interaction between the substrate and the film as well as the effect of the substrate surface roughness were found to be describable in this model by a temperature dependent random surface field. Magnetization of the thin film was calculated for various temperatures at different assumed values of the substrate Curie temperature as well as for various surface roughness grades of the substrate and various couplings between the film and the substrate.
2
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Theoretical Investigation of the Complete Phase Diagram of the SmMn_{2}Ge_{2} Metamagnet

63%
Polaszek P., Onyszkiewicz Z.
Acta Physica Polonica A
|
1993
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vol. 84
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issue 6
1101-1109
EN
A two-sublattice Ising model with spatial four-spin and six-spin anisotropy added in order to describe SmMn_{2}Ge_{2} metamagnet is discussed. The complete phase diagrams for this metamagnet as a function of hydrostatic pressure are obtained.
3
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Gaussian Fluctuations of Molecular Field in Quasi-One-Dimensional Ising Model

63%
Onyszkiewicz Z., Wierzbicki A.
|
|
vol. 95
|
issue 3
413-421
EN
Quasi-one-dimensional spin systems described by an Ising-like Hamiltonian with a strong space anisotropy (s=1/2) are investigated. Magnetic properties of this model are examined in the approximation including Gaussian fluctuations of molecular field. This paper reports an attempt at obtaining more accurate results for Gaussian fluctuation of molecular field by an exact formula for mean fluctuations of a spin.
4
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Collective Excitations in Heisenberg Ultrathin Films with Inhomogeneous Spatial Distribution of Magnetisation

63%
Łosiński R., Onyszkiewicz Z.
Acta Physica Polonica A
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2000
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vol. 98
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issue 4
419-428
EN
The influence of non-magnetic substrate on the collective excitation of the Heisenberg (s=1/2) ferromagnetic ultrathin films with homogeneous and inhomogeneous spatial distribution of magnetization is investigated. It has been proved that the collective excitation spectrum of ultrathin film may, to a significant degree, depend on the value of the coefficient characterizing the film coupling with its substrate.
5
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The Influence of Non-Magnetic Substrate on Spatial Distribution of Gaussian Fluctuations of Molecular Field in Magnetic Nanoparticles and Ultrathin Films

63%
Łosiński R., Onyszkiewicz Z.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 5
955-958
EN
An Ising (s=1) model of ferromagnetic nanoparticles and ultrathin films of the sc structure deposited on a non-magnetic substrate is considered. The substrate was assumed to affect the crystal field around the atoms lying closest to it. Consequently, the one-ion anisotropy constant of spin moments of these atoms becomes dependent on the appropriate component of the tensor of the magnetic structure deformation. This dependence was assumed to be linear. To obtain approximations of the Gaussian fluctuations of molecular field, the generalised equilibrium reduced density operator, along with the Feynman diagram technique were used. As a result, temperature dependences of the spatial distributions of mean fluctuations of the magnetic field versus the changes in the one-ion anisotropy constant induced by the non-magnetic substrate were obtained.
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