Theoretical investigation on the magnetocaloric effect in amorphous Eu80Au20Eu80Au20 system

•Magnetism and magnetocaloric effect in amorphous systems Eu80Au20Eu80Au20.•Handrich–Kobe model: Brillouin function with an additional exchange fluctuation term.•Refrigerant capacity RC depending on the amorphization of the system parameter.

In this work, we investigated the magnetic and magnetocaloric properties of the amorphous system Eu80Au20Eu80Au20. The magnetic state equation and entropy were considered in the framework of Handrich–Kaneyoshi model, which takes into account the amorphization through the symmetric exchange fluctuation in the mean field approximation. The exchange and structural fluctuations parameters were chosen based on the experimental data of Eu80Au20Eu80Au20. The isothermal entropy change was calculated for several variations of external magnetic field. Furthermore, the adiabatic temperature change and the refrigerant capacity were calculated for a magnetic field change from 0 to 5 T.