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Heisenberg Model of a Ferromagnetic Monolayer Deposited on a Non-Magnetic Bulk Substrate

100%
Jaworski W.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 1
171-173
EN
A model describing a Heisenberg ferromagnetic monolayer (in a magnetic field) interacting with its non-magnetic bulk substrate is formulated. We use reduced-density operators to show that physical properties of the monolayer are affected by its interaction with the environment. Particularly the influence of the substrate lattice vibrations on the monolayer exchange parameter is examined. The Gaussian-type orbitals were used to calculate the distance dependence of the exchange parameter and the many-body Green functions to calculate the temperature dependence of the magnetization. Finally, the influence of the Debye temperature of the substrate on the magnetization of the monolayer is depicted. Although the resultant effect is not prominent, we state that interaction of ultrathin magnetic films with their environment has to be taken into account in the construction of the reduced-density operator.
2
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Gaussian Fluctuations of Two Molecular Fields in the Blume-Emery-Griffiths Model

63%
Jaworski W., Jacyna-Onyszkiewicz Z.
Acta Physica Polonica A
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2011
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vol. 119
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issue 6
846-849
EN
The Blume-Emery-Griffiths model for spins S=1 in a bilayer with z=5 nearest neighbours is studied with the use of Gaussian fluctuations approximation. The fluctuations of two molecular fields, connected with two order parameters, are introduced. Their influence on phase diagrams for non-negative values of the biquadratic coupling constant is taken under consideration. The results are compared with those obtained by the mean-field approximation and discussed.
3
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The Deposition of Gold Nanoparticles Onto Activated Carbon

51%
Jaworski W., Pacławski K., Szaciłowski K., Streszewski B.
Archives of Metallurgy and Materials
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2014
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issue 3
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