https://doi.org/10.1140/epjb/s10051-026-01142-1
Research - Statistical and Nonlinear Physics
Asymmetric ferrimagnetic bilayers with intralayer exchange anisotropy: magnetocaloric and critical properties
1
Groupe de Simulations Numériques en Magnétisme et Catalyse (GSMC), Faculté des Sciences et Techniques, Université Marien Ngouabi, P.O. Box 69, Brazzaville, Congo
2
Ecole Nationale Supérieure de Génie Energétique et Procédés (ENSGEP), Université d’Abomey, 01 P.O. Box 486, Abomey, Benin
3
Institute of Mathematics and Physical Sciences (IMSP), 01 P.O. Box 613, Porto-Novo, Benin
4
Laboratoire de Matière Condensée et Sciences Interdisciplinaires (LaMCScI), Faculté des Sciences de Rabat, Université Mohammed V, P.O. Box 1014, Rabat, Morocco
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Received:
2
December
2025
Accepted:
2
February
2026
Published online:
13
March
2026
Abstract
We study the magnetic and magnetocaloric properties of an asymmetric ferrimagnetic bilayer composed of spin-1 and spin-1/2 Ising sublattices, including intralayer exchange anisotropies and an antiferromagnetic interlayer coupling. Using Monte Carlo simulations with the Metropolis algorithm, we incorporate anisotropic in-plane interactions, a Blume–Capel single-ion anisotropy acting on the spin-1 layer, and an external magnetic field. Critical temperatures are determined from Binder cumulants, while compensation temperatures are identified from sublattice magnetizations. The temperature derivative of the entropy and isothermal entropy change are evaluated to characterize the magnetocaloric response under weak fields. The results show that anisotropy in the spin-1 layer strongly tunes the compensation point, whereas anisotropy in the spin-1/2 layer mainly affects the stability of the ordered phase. Hysteresis loops exhibit several switching mechanisms, including multi-loop structures, driven by the interplay between anisotropy and interlayer coupling. These findings underline the crucial role of anisotropic exchange and Blume–Capel physics in tailoring magnetocaloric and coercive properties of ferrimagnetic bilayers.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
