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Critical temperature studies of the anisotropic bilayer and multilayer Heisenberg ferromagnets in Pair Approximation

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  • Szałowski, Karol
  • Balcerzak, Tadeusz

Abstract

The Pair Approximation method is applied to studies of the bilayer and multilayer magnetic systems with simple cubic structure. The method allows to take into account quantum effects related to non-Ising couplings. The paper adopts the anisotropic Heisenberg model for spin S=1/2 and considers phase transition temperatures as a function of the strength of exchange integrals in line with the role of intra- and interplanar anisotropic interactions in the onset of low-dimensional magnetism. The compensation effect for the Curie temperature is found for asymmetric interactions within the neighbouring planes of the bilayer system. The paper predicts the saturation of the Curie temperature for strong interplanar interactions. However, such an effect for the multilayer system occurs only when the interplanar interactions are purely of isotropic character.

Suggested Citation

  • Szałowski, Karol & Balcerzak, Tadeusz, 2012. "Critical temperature studies of the anisotropic bilayer and multilayer Heisenberg ferromagnets in Pair Approximation," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 391(6), pages 2197-2208.
    • Handle: RePEc:eee:phsmap:v:391:y:2012:i:6:p:2197-2208
    DOI: 10.1016/j.physa.2011.11.058
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