  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 ($\Delta S_{m}$) for
these multilayer samples can be tuned and controlled by changing their layout.
A large $\Delta S_{m}$ over a wide temperature range which goes beyond room
temperature is observed in all samples. We observe a temperature-independent
table-top-like $\Delta S_{m}$ over a temperature range as large as 100 K in the
trilayer samples. La2NiMnO6 double perovskite with multiple magnetic phase
transitions is the key to tuning and shaping the temperature dependence of the
magnetic entropy changes to suit the requirements of several cooling cycles.
