Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 323, Issue 15, Pages 2095-2102Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2011.03.020
Keywords
Magnetocaloric effect; Heisenberg model; Ising model; Pair approximation
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The thermodynamics of a site-diluted ferromagnetic Heisenberg model for spin S = 1/2 with interaction anisotropy in spin space is investigated. The study is aimed at presenting the magnetocaloric properties of such a model, including the entropy and temperature changes in magnetization/demagnetization processes, generalized Gruneisen ratio as well as the quantities characterizing the efficiency of magnetic cooling cycles. The results are obtained using pair approximation (PA) method and extensively compared with the molecular field approximation (MFA) calculations. The importance of interaction anisotropy and site-dilution is discussed. The inadequacy of the MFA approach (even on the qualitative level) is found for selected quantities, while PA provides the results which are consistent with the experimentally observed behavior. (c) 2011 Elsevier B.V. All rights reserved.
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