Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1802741 | Journal of Magnetism and Magnetic Materials | 2009 | 4 Pages |
Abstract
The magnetocaloric effect (MCE) in the DyNi2, DyAl2 and Tb1ânGdnAl2 (n=0, 0.4, 0.6) was theoretically investigated in this work. The DyNi2 and DyAl2 compounds are described considering a model Hamiltonian which includes the crystalline electrical field anisotropy. The anisotropic MCE was calculated changing the magnetic field direction from ã1Â 1Â 1ã to ã0Â 0Â 1ã in DyNi2 and from ã1Â 0Â 0ã to ã0Â 1Â 1ã in DyAl2. The influence of the second- and first-order spin-reorientation phase transitions on the MCE that occurs in these systems is discussed. For the calculations of the MCE thermodynamic quantities in the Tb1ânGdnAl2 systems we take into account a two sites magnetic model, and good agreement with the available experimental data was obtained.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
V.S.R. de Sousa, E.J.R. Plaza, M.S. Reis, B.P. Alho, A. Magnus G. Carvalho, S. Gama, N.A. de Oliveira, P.J. von Ranke,