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Magnetic properties of a series of (La0.7Sr0.3MnO3/SrRuO3) superlattices,where the SrRuO3 layer thickness is varying, are examined. A room-temperaturemagnetocaloric effect is obtained owing to the finite size effect which reducesthe TC of La0.7Sr0.3MnO3 layers. While the working temperature ranges areenlarged,, -DeltaSmax values remains similar to the values in polycrystallineLa0.7Sr0.3MnO3. Consequently, the relative cooling powers are significantlyimproved, the microscopic mechanism of which is related to the effect of theinterfaces at La0.7Sr0.3MnO3/SrRuO3 and higher nanostructural disorder. Thisstudy indicates that artificial oxide superlattices/multilayers might providean alternative pathway in searching for efficient room-temperature magneticrefrigerators for (nano)microscale systems.

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