Magnetocaloric effect and improved relative cooling power in (La0.7Sr0.3MnO3/SrRuO3) superlattices

TL;DR

This study investigates (La0.7Sr0.3MnO3/SrRuO3) superlattices, demonstrating enhanced magnetocaloric effects and relative cooling power at room temperature, with potential applications in nanoscale magnetic refrigeration.

Contribution

It reveals how interface effects and nanostructural disorder in superlattices improve magnetocaloric properties for room-temperature cooling.

Findings

Room-temperature magnetocaloric effect achieved.

Enhanced relative cooling power in superlattices.

Interface effects contribute to improved performance.

Abstract

Magnetic properties of a series of (La0.7Sr0.3MnO3/SrRuO3) superlattices, where the SrRuO3 layer thickness is varying, are examined. A room-temperature magnetocaloric effect is obtained owing to the finite size effect which reduces the TC of La0.7Sr0.3MnO3 layers. While the working temperature ranges are enlarged,, -DeltaSmax values remains similar to the values in polycrystalline La0.7Sr0.3MnO3. Consequently, the relative cooling powers are significantly improved, the microscopic mechanism of which is related to the effect of the interfaces at La0.7Sr0.3MnO3/SrRuO3 and higher nanostructural disorder. This study indicates that artificial oxide superlattices/multilayers might provide an alternative pathway in searching for efficient room-temperature magnetic refrigerators for (nano)microscale systems.