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 Delta S-M = -2.5 J/kg K and adiabatic temperature change Delta T-ad = 3.1 K at an applied field of 6.5 T and near Curie temperature (similar to 160 K). Based on the analysis of Debye approximation, the lattice entropy change reaches Delta S-L = 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. (C) 2007 Elsevier B.V. All rights reserved.