Abstract:It is known that some of RMnO 3 and RMn 2 O 5 (R = rare earth) multiferroic crystals reveal a strong interplay between their magnetic and electric order parameters, paving the way for applications in spintronic technologies. Additionally, recent works have also pointed out their potential utilization as refrigerants in magnetocaloric cooling systems for cryogenic tasks. In this paper, recent advances regarding the magnetocaloric properties of both RMnO 3 and RMn 2 O 5 families of multiferroics are reviewed. With the aim of understanding the RMnO 3 and RMn 2 O 5 magnetocaloric features, their structural and magnetic properties are discussed. The physics behind the magnetocaloric effect as well as some of its key thermodynamic aspects are also considered.

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The HoVO 3 orthovanadate undergoes a large negative and conventional magnetocaloric effects around 4 K and 15 K, respectively. The partly overlapping of the magnetic transition at 15 K and the structural transition occurring at 40 K, as well as the large magnetization, give rise to a giant refrigerant capacity without hysteresis loss. For a magnetic field variation of 7 T, the refrigerant capacity is evaluated to be 620 J/kg, which is larger than that for any known RMnO 3 manganite. These results should inspire and open new ways for the improvement of magnetocaloric properties of ABO 3 type-oxides. V