Bulletin of the American Physical Society
2024 APS March Meeting
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session Z22: Disordered Magnetic Materials
11:30 AM–2:18 PM,
Friday, March 8, 2024
Room: 101B
Sponsoring
Unit:
GMAG
Chair: James Beare, Oak Ridge National Laboratory
Abstract: Z22.00002 : Entropy changes and the magnetocaloric effect in anisotropic magnetic materials*
11:42 AM–11:54 AM
Presenter:
Nilson Antunes de Oliveira
(Universidade do Estado do Rio de Janeiro)
Authors:
Nilson Antunes de Oliveira
(Universidade do Estado do Rio de Janeiro)
Julieth C Patiño
(Universidade do Estado do Rio de Janeiro)
In this work, we theoretically discuss the magnetic properties and the magnetocaloric effect of anisotropic magnetic materials with two or more nonequivalent sites. For this purpose, we consider a model Hamiltonian of interacting magnetic moments with extra terms to account for the anisotropy and the nonequivalence of the sites in the crystalline lattice. In the first step, we perform a systematic analysis in terms of the model parameters to understand the physics behind the different behaviors observed in the curves of the caloric quantities. Afterwards, we apply the model to calculate the magnetocaloric quantities in the compounds RCu2Cd where R stands for rare earth element. Our obtained results of the entropy change are in reasonable agreement with the available experimental data.
*We acknowledge financial support from CNPq and FAPERJ
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