Abstract
In this work the magnetocaloric effect is theoretically investigated considering amicroscopic model Hamiltonian, which describes a magnetic system formed by twosublattices of different magnetic ions coupled by exchange and magnetoelasticinteractions. We analyze systematically several profiles of the ferrimagnetic arrangementsthat were studied earlier without the magnetoelastic interaction. The influence ofchanging the magnetoelastic parameters on the magnetization, isothermal entropychange and adiabatic temperature change curves are investigated. Depending onthe model parameters, the magnetic system shows a first-order magnetic phasetransition leading to high direct and inverse magnetocaloric effect, besides twosimultaneous first-order magnetic phase transitions which were predicted. A constantΔST = 0.4 J mol − 1 K − 1 is obtained in the simulated system in a temperature interval of 50 K, around110 K.
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