Abstract
We report a detailed study of the magnetocaloric effect in heterostructures of La2NiMnO6 and La2/3Sr1/3MnO3. The shape, width and magnitude of the temperature dependence of the magnetic entropy change (ΔSm) for these multilayer samples are affected by their layout with a clear impact from epitaxial strains on each layer. A large ΔSm over a wide temperature range which goes beyond room temperature is observed in all samples. We observe a temperature-independent table-top-like ΔSm over a temperature range as large as 100K in the trilayer samples. La2NiMnO6 double perovskite with multiple magnetic phase transitions sensitive to strain is the key to tuning and shaping the temperature dependence of the magnetic entropy changes to suit the requirements of several cooling cycles.
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