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The magnetocaloric effect of La 0.45 Sr 0.55 MnO 3 nanoparticles was studied by dc magnetization measurements. A sample with mean particle size of about 140 nm exhibits both a conventional magnetocaloric effect around the Curie temperature (% 295 K) and a large inverse magnetocaloric effect around the antiferromagnetic-ferromagnetic transition temperature (% 200 K). The change of magnetic entropy increases monotonically with applied magnetic field and reaches the values of 5.51 J/kg K and Àdoi:10.1063/1.3614586 fatcat:kfblmo32hreftbpmlt4aqngswi