In the present investigation, the effect of annealing temperature on the structural, electrical transport

and the magnetocaloric effect of Nd0.6Sr0.4MnO3manganites have been studied. Rietveld refinement of

XRD data reveals that all samples are single phase with a space group (Pnma). Heat treatment enhances

the grain size and decreases the porosity. All samples suffer Curie transition from ferromagnetic to

paramagnetic. Magnetocaloric parameters have been determined by the analysis of isothermal M (H)

curves around Curie temperature (DH¼2 T) for samples. Heat treatment enhances magnetic entropy,

which reaches a maximum at Tan¼900 C. In addition, the rate cooling power records highest value at