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

TL;DR

This study investigates how particle size and dimensionality influence the magnetic and magnetocaloric properties of La$_{0.6}$Ca$_{0.4}$MnO$_{3}$ nanostructures, revealing optimized cooling performance at specific sizes.

Contribution

It introduces advanced nanostructures of LaCaMnO with controlled particle sizes and demonstrates how these sizes affect magnetic and magnetocaloric behaviors, filling a knowledge gap in nanostructured manganites.

Findings

Magnetic transition broadening increases with decreasing particle size.

Optimal relative cooling power (RCP) observed at 223 nm particle size.

Nanostructures exhibit tunable magnetic and magnetocaloric properties.

Abstract

Manganites have been attracted considerable attention due to some intriguing magnetic properties, such as magnetoresistance, spin glass behavior and superparamagnetism. In recent years, some studies point to the effect of particle size and dimensionality of these compounds in their magnetic features. Particularly, LaCaMnO material research is well explored concerning the bulk material. To overcome the lack of the information we successfully produced advanced nanostructures of La$_{0.6}$Ca$_{0.4}$MnO$_{3}$ manganites, namely nanotubes and nanoparticles by using a sol-gel modified method, to determine the size particle effect on the magnetism. The manganites crystal structure, magnetic and magnetocaloric properties were studied in a broad temperature range. Transmission electron microscopy revealed nanoparticles with sizes from 45 up to 223 nm, depending on the calcination temperature. It was found that the magnetic and magnetocaloric properties can be optimized by tuning the particle size; for instance, the magnetic transition broadening by decreasing the 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 and magnetocaloric potentials in nanostructured systems with distinct morphologies.