Investigation of magnetocaloric effect in Dy doped TbMnO3

• The magnetocaloric effect studies of Dy doped TbMnO3 multiferroics using sp. heat data were made.
• Based on these studies, parameters ΔS, ΔT and RCP were also evaluated.
• These results suggest that these materials may be exploited for mag. refrigerant applications.

Multiferroic materials with the compositional formula, Tb1−xDyxMnO3 (x=0.1, 0.2, 0.3 and 0.4) were prepared by the sol gel technique. After characterizing the samples structurally, a systematic investigation of specific heat has been undertaken, over a temperature range 4–300 K in 0 T and 5 T magnetic fields. All the samples display interesting specific heat behavior exhibiting transitions due to the long range ordering of Mn3+ as well as R3+ magnetic moments. Magnetic field change generates an entropy change of ~1 J/mol K when a magnetic field changes from 0 to 5 T in the vicinity of antiferromagnetic ordering temperature of R3+. The values of adiabatic temperature change is also appreciable to consider these materials as possible magnetic refrigerants at low temperatures.