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1
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Fracton Excitations in the Magnetic "Net Fractal" Systems

100%
Bąk Z.
Acta Physica Polonica A
|
2008
|
vol. 113
|
issue 1
541-544
EN
A localized spin system of fractal symmetry and Heisenberg exchange between nearest neighbors is considered. We define a specific class of fractals: "net fractals" and prove that in the logarithmic scale they are isomorphic with some bulk crystals. Further, with the use of logarithmic coordinates we show that the "net fractal" magnetic fractons can be presented as the conventional magnons.
2
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Fracton Contribution to the Electron and Magnon Pairing

100%
Bąk Z.
Acta Physica Polonica A
|
2014
|
vol. 126
|
issue 1
372-373
EN
We show that high temperature superconductivity contrary to the Bardeen-Cooper-Schrieffer /BCS/ superconductors exhibits three important energy scales. The highest is associated with the formation of Cooper pairs coupled due to the magnetic fracton excitations, the second (pseudogap) we ascribe to the formation of coherent but not nonsuperfluid condensate. The lowest energy scale (superconducting gap) we associate with the onset of superfluidity of the condensate that is due to the phonon aided fracton hopping.
3
Content available remote

Magnetoelastic Effects and Magnetic anisotropy in Superlattice System

63%
Jaroszewicz R., Bąk Z.
Acta Physica Polonica A
|
1997
|
vol. 91
|
issue 2
325-328
EN
In this contribution, we will discuss the effect of interface misfit strain on magnetic coupling of ferromagnetic layers, across intervening, metallic spacer in the epitaxial superlattice system. We calculate the interface lateral lattice deformation, due to ionic radii misfit within the Frenkel-Kontorova model and derive its influence on surface magnetic anisotropy and electronic properties of the nonmagnetic spacer. We will study also the origin of the interface magnetoelastic asymmetry in superlattices and its effect on magnetic coupling between magnetic layers. Also the magnetoelastic contribution to the in-plane exchange coupling is widely discussed.
4
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Lattice Misfit Strain as Origin for Biquadratic Interlayer Coupling

51%
Jaroszewicz R., Bąk Z., Gruhn W.
Acta Physica Polonica A
|
1996
|
vol. 89
|
issue 3
421-424
EN
The direct observations of some MBE grown superlattices show large interfacial undulations, which is attributed to the elastic relaxation of tensile layers. Assuming that the interface lateral lattice deformation, due to ionic radii misfit, is given by the periodic solution of the Frenkel-Kontorova model, we calculate the magnetoelastic contribution to the biquadratic magnetic coupling between ferromagnetic layers across the nonmagnetic spacer. We show that due to the correlated modulations of the effective bilinear exchange integral, there arises a biquadratic exchange which favours perpendicular orientations of magnetization in adjacent ferromagnetic layers.
5
Content available remote

RKKY-like Biquadratic Exchange in Magnetic Superlattices

51%
Gruhn W., Bąk Z., Jaroszewicz R.
Acta Physica Polonica A
|
1996
|
vol. 89
|
issue 3
417-420
EN
We show that in magnetic metallic superlattices along with the bilinear RKKY-reminiscent interaction between magnetic superlattices there can be an important quadrupole-quadrupole coupling. In an analytical way we derive the range functions of the quadrupol-quadrupole interaction and discuss its relation to magnetoresistivity.
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