Theoretical study of the electronic structure, magnetic and magnetocaloric properties of the DyMn_2O_5 multiferroic

摘要

The magnetocaloric effect is characterized by a magnetic entropy change and an adiabatic temperature change. The DyMn_2O_5 system has attracted wide interest, particularly because of its multiferroic properties. Using ab initio methods, we investigated its electronic properties, such as the band gap value, the magnetic and magnetocaloric properties were also investigated using Monte Carlo simulations. We noticed an easy axis of magnetic spins along the y-direction with a large magnetic entropy change (△S_M~(max) = 11.09 J Kg~(-1) K~(-1)). These values were obtained with a magnetic field up to 70 kOe, making DyMn_2O_5 a good candidate for magnetic cooling at low temperature.