The influence of interplanar coupling on the entropy and specific heat of the bilayer ferromagnet

Abstract

The Pair Approximation method is applied to studies of the magnetic Ising-Heisenberg bilayer with simple cubic structure and spin $S=1/2$. The method allows to take into account quantum effects related to Heisenberg couplings. In the paper the entropy and magnetic contribution to the specific heat are calculated. A special attention is paid to the case when the planes are magnetically non-equivalent and the interplanar coupling is relatively weak. A double peak structure in the temperature dependence of the specific heat and the entropy change in the external field is found. When the system is strongly anisotropic (the case of Ising couplings) the Exact Calculations for Finite Cluster are performed for comparison with the Pair Approximation method.

References in corpus (6)

• Magnetocaloric effect in one-dimensional antiferromagnets
• Magnetocaloric effect in the frustrated square lattice J1-J2 model
• Magnetocaloric effect in two-dimensional spin-1/2 antiferromagnets
• Thermodynamic properties of a diluted Heisenberg ferromagnet with interaction anisotropy -- magnetocaloric point of view
• Critical Temperature Studies of the Anisotropic Bi- and Multilayer Heisenberg Ferromagnets in Pair Approximation
• Magneto-thermal properties of the spin-s Heisenberg antiferromagnet on the cuboctahedron

Cited by in corpus (3)

• Normal and inverse magnetocaloric effect in magnetic multilayers with antiferromagnetic interlayer coupling
• Ferrimagnetism and compensation temperature in spin-$1/2$ Ising trilayers
• Critical temperature of site-diluted spin-1/2 systems with long-range ferromagnetic interactions