Magnetocaloric effect in 4d itinerant ferromagnet SrRuO3

The magnetocaloric effect (MCE) in 4d itinerant ferromagnet SrRuO3 prepared by conventional ceramic processing has been investigated using superconducting quantum interference device (SQUID). SrRuO3 material exhibits magnetic entropy change ΔSM = −2.5 J/kg K and adiabatic temperature change ΔTad = 3.1 K at an applied field of 6.5 T and near Curie temperature (∼160 K). Based on the analysis of Debye approximation, the lattice entropy change reaches ΔSL = 0.34 J/kg K and is 12% of total entropy changes. The present work demonstrates the importance of the lattice entropy change in SrRuO3 material with second-order phase transition since the large change in lattice volume exhibits near Curie temperature.