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Manganites have been attracted considerable attention due to some intriguingmagnetic properties, such as magnetoresistance, spin glass behavior andsuperparamagnetism. In recent years, some studies point to the effect ofparticle size and dimensionality of these compounds in their magnetic features.Particularly, LaCaMnO material research is well explored concerning the bulkmaterial. To overcome the lack of the information we successfully producedadvanced nanostructures of La$_{0.6}$Ca$_{0.4}$MnO$_{3}$ manganites, namelynanotubes and nanoparticles by using a sol-gel modified method, to determinethe size particle effect on the magnetism. The manganites crystal structure,magnetic and magnetocaloric properties were studied in a broad temperaturerange. Transmission electron microscopy revealed nanoparticles with sizes from45 up to 223 nm, depending on the calcination temperature. It was found thatthe magnetic and magnetocaloric properties can be optimized by tuning theparticle size; for instance, the magnetic transition broadening by decreasingthe particle size. We report the relative cooling power (RCP) of these samples;it was found that the best RCP was observed for the 223 nm particle (508 J/Kg).Finally, this work contributes to the research on the magnetic properties andmagnetocaloric potentials in nanostructured systems with distinct morphologies.

Magnetic and magnetocaloric properties of La$_{0.6}$Ca$_{0.4}$MnO$_{3}$ tunable by particle size and dimensionality