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The magnetocaloric effect (MCE) is the key concept to produce new, advanced,freon-like free, low cost and environmental friendly magnetic refrigerators.Among several potential materials, $Sm_{0.6}Sr_{0.4}MnO_3$ manganite presentsone of the highest MCE value in comparison to all other known manganites;however, its studied was only concentrated on the bulk material. To overcamethis lack of the information we successfully produced advanced nanostructures,namely nanoparticles and nanotubes of that highlighted manganite by using asol-gel modified method. High resolution transmission electron microscopyrevealed nanoparticle and nanotube diameters of 29 nm and 200 nm, respectively;and, in addition, this technique also showed that the wall of the nanotube isformed by the nanoparticles with 25 nm of diameter. The magnetocaloricpotentials, ${\Delta}S_M$ versus T curves, of the nanostructures were obtainedand they are broader than the their bulk counterpart. This increases the usefultemperature range of a magnetic refrigerator. But also an undesired M-shapeprofile for the nanotube sample was observed, due to the rising of asuperparamagnetic behavior. These results also evidenced the existence of ananoparticle size threshold below which the advantage to make the transitionwider is no longer valid.

Magnetocaloric functional properties of $Sm_{0.6}Sr_{0.4}MnO_3$ manganite due to advanced nanostructured morphology