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Quantum Model for Ferromagnetic Thin Films with an Alternating Crystal Field

100%
Kecer J., Tuleja S.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
197-200
EN
Within the framework of many-body Green's function theory there are studied the properties of the quantum Blume-Capel model for ferromagnetic films with an alternating single-ion anisotropy on the odd atomic layers and on the even ones. We analyse various possible phase diagrams for the surface exchange couplings and the single-ion anisotropy parameters.
2
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Parallel Susceptibility of Thin Ferromagnetic Films within Many-Body Green's Function Theory

100%
Ilkovič V., Kecer J.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
201-204
EN
Parallel susceptibility of the quantum Blume-Capel model for ferromagnetic films is calculated within the Green function theory. The Hamiltonian includes a Heisenberg term with the different surface exchange coupling with respect to bulk, an external magnetic field, a second-order uniaxial single-ion anisotropy, and the exchange anisotropy. The importance of collective excitations is demonstrated by comparing with result calculated within mean field approximation.
3
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The Reorientation Temperature in an Antiferromagnetic Monolayer

100%
Ilkovič V., Kecer J.
|
EN
The reorientation temperature in an antiferromagnetic square lattice is studied within the framework of many-body Green function theory. The model Hamiltonian includes a Heisenberg term, second-order single-ion anisotropy, and a transverse external magnetic field in the x-direction. We investigate the orientation temperature as a function of the single-ion anisotropy parameter and for different transverse magnetic fields.
4
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Study of Axial Dimension of Static Head-to-Head Domain Boundary in Amorphous Glass-Coated Microwire

81%
Kladivová M., Ziman J., Kecer J., Duranka P.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
639-641
EN
A new experiment allowing the study of static domain boundary dimensions in bistable microwire is proposed. In this experiment a static domain boundary is created by an inhomogeneous axial magnetic field. The changes in axial magnetic flux due to the presence of this boundary were measured along the microwire using two pick-up coils. Experimental results were compared with a simple theoretical model. For Fe_{77.5}Si_{7.5}B_{15} microwire with total diameter of 30 μm and metal nucleus diameter of 15 μm, good agreement between theoretical and experimental data was obtained for an axial dimension of the static domain boundary about 200 times larger than the diameter of the wire metallic core.
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